- test-drb@ccmp.vtda.org - classiccmp.org

Commordore 64 character color cycling (Ethan Dicks)

by tpresence＠hotmail.com

> > The Color SRAM is a 2114. Very ordinary and, in my experience, prone > to failure. > > If you have another C-64, you could try swapping the PLA. You will > need an 18-pin socket for the SRAM. The chips are available from a > number of surplus places like Unicorn Electronics, BG Micro, and more. > Speed ranges for the 2114 are, IIRC, 250ms-450ms. I don't remember > what speed the C-64 requires, but you can typically sub a faster chip > than the circuit requires. > > -ethan I have already purchased a replacement sram for the 2114 (acutally 2 of the units, one P2114 and one MM2114N-2) and intend to replace the IC sometime today. I do have another C64, but no chips are socketed, and I don't want to ruin it, thus I'll just try replacing it in the bad unit. My understanding is that I need a chip that has a speed faster than half a machine cycle for the system to work properly. The spec sheet on the P2114 states that it has a 450ns access time. For the MM2114N-2 it looks like its 200ns. I understand that the access speed requirement is .5*(cpu freq/1)/machine-cycle. I don't know the machine cycle for this operation, but assuming the worst with an IC having an access time of 450ns, the machine-cycle couldn't be over 2.25 for things to be ok. If I use the 200ns IC, I should be good with a machine-cycle of just over 5. I could probably solve this by opening up the unit and just pulling the IC scribe marks and looking up the data sheet, but the location with the ICs is 50 miles from the house, and I happened to be nearby yesterday...so I just winged it. Can anyone checksum my thoughts here? Is my algorithm and its implementation ok? I also bought a replacement for the PLA, however, I had misunderstood the requirement. I thought it was just a plain ole N82S100, but now I understand that it is a specially programmed N82S100. Although I have found a ROM file I could perhaps burn on the chip, I simply don't have the gear. I'm hoping this isn't the problem, as I have to mail order the part, but I understand that this is the most common IC to fail on the C64 board. Since I'm getting only character color palette cycling, and have a border and don't have a problem with a blank screen, I am encouraged that this IC is probably ok. Just to be safe, I bought a replacement for U29, as the description in the c64 chip and common problems guide has content that really looks similar to my problem, moreso than even the description for problems with U6 (the 2114). Thanks for your commentary though. I'm likely to buy sockets for these chips as well, as they aren't that expensive, and it may save me issues should the selection I made be suboptimal. Kevin

14 years, 5 months

3
2
0 0

Well, that's depressing.

by derschjo＠mail.msu.edu

eBay item 320840589826. I suppose if anyone's looking for a Symbolics Ivory 2 CPU to play around with (LispM on a chip) here's your chance. Sad to think about all the machines these came out of... - Josh

14 years, 5 months

2
1
0 0

C compilers and non-ASCII systems

by jonas＠otter.se

At 11:21 AM -0500 1/31/12, Sean Conner wrote: > > So now I'm wondering---besides Baudot, 6-bit BCD and EBCDIC, is there any > >other encoding scheme used? And of Baudot, 6-bit BCD and EBCDIC, are there > >any systems using those encoding schemes*AND* have a C compiler available? > > Not sure what you mean by 6-bit BCD? For current systems which use a 6-bit character code, the Unisys 1100/2200 class systems (ClearPath nowadays) use Fieldata as well as 9-bit ASCII. They have a C compiler. These machines are 36-bit, so to fit ASCII characters in, they extended the characters to 9 bits, fitting 4 "ASCII" characters in a word instead of 6 Fieldata characters. It is possible to use all 9 bits which creates interesting problems when you need to migrate the code to a different architecture. I have come across (ancient but "modernised") applications which mix Fieldata and 9-bit ASCII... Also IIRC there is no reasonable way to handle Fieldata in Unisys C, so you have to treat Fieldata characters as hex or octal values. /Jonas

14 years, 5 months

2
1
0 0

off topic? Signetics chips 10K ecl chips available

by useddec＠gmail.com

Starting to go through some smaller boxes and found a few thousand Signetics 10100 - 10175 chips. all sorted (pretty much) bulk. and some hard to find. Date codes are mostly around 1978. I would like to sell in as large a lot as possible or maybe variety packs. I have 3 or 4 gaylords of small parts,mostly chips,and it's going to be a slow. process. The company I got this from was a board repair depot, and also repaired core memory boards. Please feel free to contact me off list with any questions. shipping fron 61853. Thanks, Paul

14 years, 5 months

2
1
0 0

Visiting Bristol UK

by huw.davies＠mail.vsm.com.au

I'm yet again visiting Bristol UK for most of January 2012. I guess during the week I'll have to attend the training course that work is sending me to, but I wondered if anyone had any classic computer recommendations for the weekend? Assuming the weather is OK, I'm happy to drive a reasonable distance but local stuff is easier. I did Bletchley Park last time I was in the UK (November 2010) and I've already promised myself that I'll visit the SS Great Britain and the Newport cable bridge, but wondered if there were other CC related things in the area. If anyone in the area wants to catch up for a beer, I'd happily shout a pint of the local bitter. Huw Davies | e-mail: Huw.Davies at kerberos.davies.net.au Melbourne | "If soccer was meant to be played in the Australia | air, the sky would be painted green"

14 years, 5 months

3
3
0 0

C compilers and non-ASCII systems

by tshoppa＠wmata.com

IBM has a very handy page on C compatibility with EBCDIC system services: http://www-03.ibm.com/systems/z/os/zos/features/unix/bpxa1p03.html

14 years, 5 months

2
1
0 0

C compilers and non-ASCII systems

by cym224＠gmail.com

On 31 January 2012 12:21, Zane H. Healy <healyzh at aracnet.com> wrote (in part): >> And of Baudot, 6-bit BCD and EBCDIC, are there >> any systems using those encoding schemes *AND* have a C compiler >> available? z/OS is not only POSIX, it is UNIX (see http://www.opengroup.org/openbrand/register/brand3470.htm). (Sorry for not replying to the OP -- I just saw this now.) N

14 years, 5 months

2
1
0 0

Looking for Andrew Back

by dbetz＠xlisper.com

Does anyone here know how to contact Andrew Back? I have some equipment to send him and I need a mailing address. Thanks, David Betz

14 years, 5 months

1
0
0 0

Repairing a TI-1270 calculator

by jgessling＠yahoo.com

Thanks Tony.? As you suggested there are 10 wires connecting the main board to the keypad.? As in 4 x 6.? I fiddled around a little, gently.? I've ruined another similar unit by cutting those wires in hopes of reattaching them so I was avoiding that.? I guess I made something that was loose become a circuit at least for now.? I works great.? Really a treat to see it work.? Maybe not an HP, but they rarely break anyway. Jim

14 years, 5 months

2
1
0 0

Commordore 64 character color cycling

by tpresence＠hotmail.com

I have a malfunctioning C64 that I would like to repair that is exhibiting the most odd of behaviors. The system operates fine, except displayed fonts cycle through the color palette. If you remember the old atari 2600 game "Adventure" its behaves like the chalice does, every second or so changing colors. I haven't started probing the system at all, and although I can use a soldering iron, my troubleshooting skills are pretty rusty. I was considering this a good project for a refresher. Sound doable, or is it likely I'll be looking to replace lots of components on the board? Kevin

14 years, 5 months

5
5
0 0

C compilers and non-ASCII systems

by cctech＠beyondthepale.ie

At 11:21 AM -0500 1/31/12, Sean Conner wrote: > A friend recently raised an issue with some code I wrote (a hex dump >routine) saying it depended upon ASCII and thus, would break on non-ASCII >based systems (and proposed a solution, but that's beside the issue here). >I wrote back, saying the code in question was non-portable to begin with >(since it depended upon read() and write()---it was targetted at Posix based >systems) and besides, I've never encountered a non-ASCII system in the >nearly 30 years I've been using computers. > > So now I'm wondering---besides Baudot, 6-bit BCD and EBCDIC, is there any >other encoding scheme used? And of Baudot, 6-bit BCD and EBCDIC, are there >any systems using those encoding schemes *AND* have a C compiler available? > > -spc (Or can I safely assume ASCII and derivatives these days?) A unix called UTS (Universal Time Share?) by Amdahl ran (amongst other things under VM) on an Amdahl 5870 I worked with in the early 1990's. This was an EBCDIC machine. I never did much with UTS but I'm pretty sure it had a C compiler. There was also C/370 for VM/CMS and MUSIC. Regards, Peter Coghlan.

14 years, 5 months

1
0
0 0

Evil Plan

by john＠yoyodyne-propulsion.net

Mr Zoidberg, Thank you for bringing that error to our attention. John Stupid John (or web designer) has met with an unfortunate accident. On Tue, Jan 31, 2012 at 11:25 AM, <quotes at nospam.com> wrote: > First Name: JohnA > Last Name: Zoidberg > Email: cctalk at classiccmp.org > > City: > State: > Zip: > IP: xxx.xxx.xxx.xxx > Evil Plan: Your logo says "Yoyodyne Propolsion Systems", not "Yoyodyne > Propulsion Systems" > -- Yoyodyne Propulsion Systems: "The Future Begins Tomorrow" Visit us at: http://www.yoyodyne-propulsion.net -------- "Yes, Obama duped young people by not doing every single thing they want. So now, they'll all vote Republican. It's like when I want some bread, I won't settle for half a loaf. Instead, I will have a muffin made of broken glass." -Stephen Colbert

14 years, 5 months

1
0
0 0

Commordore 64 character color cycling

by dm561＠torfree.net

Original Message: Date: Mon, 30 Jan 2012 11:59:44 -0700 From: Kevin Reynolds <tpresence at hotmail.com> > I know following up your own request is kinda taboo, but I should have > shared more information... > I am guessing that the problem is with the Color RAM (SRAM) in slot U6. > This model of C64 has socketed components, but I am not sure U6 is one of > these. The other possible issue is PLA U17. As the problem never goes > away, perhaps it is more than this. > Is there a good vendor to get replacements this late in the game? > Kevin Try here: http://www.arcadecomponents.com/catalog/item/3054735/8335676.htm

14 years, 5 months

1
0
0 0

Troubling Olivetti M24 Monochrome Monitor

by hendrikvandewerken＠gmail.com

Since a few days the monitor of my Olivetti M24 displays a bright spot in the middle of the screen when the system is switched off. I suspect the screen will be soon damaged this way. I know there is a circuit in CRT monitors that prevent this. But I don't know where to look on the circuitboard. I did check the parts on the print on the tube base: they seemed to be alright, so now I'm stuck. Does anyone has a clue for me how to proceed?

14 years, 5 months

1
0
0 0

Opening the Mac M0001 case

by wheagy＠gmail.com

I allowed the case to sit overnight, and when I tried it again today, it came apart much easier...about like I expected. The floppy mechanism was definitely gummed up. It didn't appear to be damaged so I lubed it and reassembled and it works great again. Thanks for the info. Win > Something happened to the floppy drive. It worked fine for a long time, but now will not allow a disk to be fully inserted. It goes it about all but the last quarter inch. I can't see the problem by looking through the slot, so it looks like I need to get inside. The case just seemed much harder to open than I expected, so I wanted to make sure I didn't break anything. I'll be careful to stay away from the high voltage innards. >That's quite a common issue on the original 'auto-inject' drives. They were greased with this god-awful white grease stuff that turns to gooey sludge over the course of time and jams the mechanisms. Best advice is to remove it, see if it's physically damaged (I've had parts bend in them when they jam) and if it seems okay clean and re-lube the mechanism and see if you can get it moving again.

14 years, 5 months

3
2
0 0

Apple II Colour Demodulator

by thrashbarg＠kaput.homeunix.org

Hi, This might interest someone here, so I thought I'd post it. I've been working on a colour demodulator for my Apple //c. It converts the output to component video suitable for any television with component inputs. The original composite output of the //c becomes the luminance input and the circuit extracts the red and blue difference signals. It's not 100% perfect but it does display colour that mostly resembles the original NTSC colour palette. http://kaput.homeunix.org/appleii or http://kaput.retroarchive.org/appleii If you have two MC1496's, feel free to build it. I'd like to see if it works unmodified (or with any modifications) on an NTSC model Apple ][ or //. The reason why I made this is because I don't have a PAL modulator for my //c. My television does support NTSC, but the Australian version of the machine doesn't output the correct timings for NTSC... it was designed to be attached to the PAL modulator. Cheers, Alexis.

14 years, 5 months

1
0
0 0

11.98135 MHz crystal applications

by fraveydank＠gmail.com

Anyone know what this frequency is for? I have a crystal in my bin of pulls, no idea what I pulled it from (my guess would be an old dead ISA modem or sound card, given where most of my pulls came from). It doesn't divide nicely into NTSC or PAL color subcarriers (my normal assumption for weird frequencies), but it it's still a pretty common part. The one place I found it mentioned that wasn't a datasheet site had something (maybe) to do with DTMF decoding: http://ohlandl.ipv7.net/communications/Gammalink.html Any ideas? - Dave

14 years, 5 months

2
1
0 0

Looking for 8080/Z80 BASIC

by dm561＠torfree.net

----- Original Messsage: Date: Fri, 30 Dec 2011 22:43:21 -0800 From: Josh Dersch <derschjo at mail.msu.edu> Anyone have any recommendations for a reasonably featured 8080 or Z80 BASIC? What I've got running at the moment is a mongrel IMSAI 8080 with a Z80, 48K of working memory and a serial port. My eventual goal is to get CP/M running on it (I have a Cromemco 64FDC -- anyone know of either an official CP/M for this or know of a BIOS that supports this controller before I start writing my own?) but for the time being I thought it would be fun to get a BASIC running on it. <snip> Thanks, Josh ----- Reply: Just curious: Does your memory configuration support swapping out the RDOS boot/monitor ROM? And what drive(s) do you have connected? As you probably know, the FDC supports 5.25"DD as well as 8" and the 3.5 and 5.25" HD equivalents. I haven't seen any standalone BASIC versions for the FDC; there are at least two versions of BASIC for the Cromemco, but AFAIK they both require a bootable CDOS disk. However, unless they use any of the extra calls in CDOS I wouldn't be surprised if they worked just as well with CP/M. In addition to Cromemco's CDOS CP/M equivalent AFAIK there were also at least two official third-party CP/M implementations for the FDC and one or two hacked BIOSes, but there may be compatibility issues among the three different versions of the FDC. Interesting though; I'll have to look around...

14 years, 5 months

70
536
0 0

Opening the Mac M0001 case

by wheagy＠gmail.com

HI, Can someone give me the Cliff Notes version of opening the M0001 case? I removed the five screws from the back (including the two deeply recessed screws) but the case is just as tight as when the screws were in. What am I missing? Thanks...Win wheagy at gmail.com

14 years, 5 months

6
7
0 0

Starting point for diagnosing unhappy Commodore 1581 drive?

by derschjo＠mail.msu.edu

As if I needed another project, I picked up a 1581 yesterday at SRCS in unknown condition. Hopefully this won't distract me from my Cromemco floppy issues for too long :). The power switch was broken (permanently stuck in the "off" position) so I replaced it with one from a "parts" C-64. Once that was repaired the symptoms I'm seeing are: - Both LEDs on the front come on and stay on permanently. My understanding is that the access light should turn off after about two seconds. - If the drive is hooked up to my C128 at powerup, the 128 will hang after displaying the startup banner (I assume it's waiting for a response from the drive and not getting one...) - If a disk is in the drive, the disk will spin for a second or so and the heads will seek back to track zero. The last item makes it seem like the 6502 is running and that the EPROM contents are still valid. I dumped the EPROM and verified that its contents are correct against an image from the 'net. The power supply is a known-good & tested supply I've been using with a 1541-II. 5V and 12V supplies look fine. For good measure I've cleaned the sockets & pins for the EPROM and the WD1772 (the only two socketed chips). Anyone have any tips for narrowing down the fault before I start digging through the source listings & schematics? Thanks as always, Josh

14 years, 5 months

3
2
0 0

Opening the Mac M0001 case

by wheagy＠gmail.com

>How easy it comes of depends wether it's been removed many times before. First time removals >can be tight as hell. >Might I ask why you are removing the case bucket? Mark, Something happened to the floppy drive. It worked fine for a long time, but now will not allow a disk to be fully inserted. It goes it about all but the last quarter inch. I can't see the problem by looking through the slot, so it looks like I need to get inside. The case just seemed much harder to open than I expected, so I wanted to make sure I didn't break anything. I'll be careful to stay away from the high voltage innards. Thanks...Win

14 years, 5 months

3
2
0 0

Repairing a TI-1270 calculator

by jgessling＠yahoo.com

I've gotten one of these beauties, a lovely pumpkin orange overlay around the keys.? Inserting a battery, it's pretty good? but the 4 and the 6 key just don't work. I took it apart thinking it's a stuck or rusty key but pushing just on the raw Kilxon keypad it's still the same.? I suppose there is some kind of keyboard scanning going on that's not picking up these pushes even though the actual buttons do work.? My previous experiences of opening similar TI thing have been just disastrous.? The keypad is connected to the logic board by 8 or so hard wires that are looped around to fold it into the case. If anyone has any advice on this please let me know.? Thanks, Jim

14 years, 5 months

2
1
0 0

6502 S-100 Board Writeup on S100Computers.com

by LYNCHAJ＠YAHOO.COM

Hi! The S-100 6502 CPU boards are with their builders and seem to be working. John has written up a page on S100computers.com on bringing up the S-100 6502 CPU board. http://s100computers.com/My%20System%20Pages/6502%20Board/6502%20CPU%20Boar… We are incorporating the changes necessary for S-100 6502 CPU board V2 to be IEEE-696 compliant with TMI circuitry. The changes necessary are quite extensive. However, if other builders would like to make further changes please contact me. There is a large prototyping area on the V1 board to support the new circuitry. The schematics, PCB layout, parts list, and test software other information is on the N8VEM wiki http://n8vem-sbc.pbworks.com/w/browse/#view=ViewFolder <http://n8vem-sbc.pbworks.com/w/browse/#view=ViewFolder&param=S-100%206502%2…> &param=S-100%206502%20CPU%20board%20V1 There are still plenty of the S-100 6502 CPU board V1 PCBs left so if you would like one or more please contact me. They are $20 each plus $3 shipping in the US and $6 elsewhere. Thanks and have a nice day! Andrew Lynch

14 years, 5 months

1
0
0 0

all this talk of Intertec, anyone have a Headstart?

by chrism3667＠yahoo.com

preferably one I can coerce you to sell :)

14 years, 5 months

1
0
0 0

LA36 available in Ann Arbor

by mta＠umich.edu

Does anyone want a Decwriter LA36? I've got one that I'm willing to give to anyone who will come get it (or pay for shipping, although that would be expensive). As far as I know it works although it hasn't been used in years. The one problem I know of is that the 20 mA interface was blown out in a lightning storm sometime in the 70s, but the EIA interface worked the last time I tried it. I think I also have some (perhaps all) of the user and maintenance manuals for it. I also have an acoustic coupler if you want the true 1970s experience. This is located in Ann Arbor, MI so it would be easiest for someone in southern Michigan or northern Ohio or Indiana to come get it. Mike Alexander

14 years, 5 months

2
1
0 0

Willem EPROM programmer

by legalize＠xmission.com

Does anyone have any experience with this device? It's inexpensive and seems like it might handle the needs of ROM/PROM/EPROM dumping and EE/EPROM programming. <http://www.sivava.com/> -- "The Direct3D Graphics Pipeline" -- DirectX 9 version available for download <http://legalizeadulthood.wordpress.com/the-direct3d-graphics-pipeline/> Legalize Adulthood! <http://legalizeadulthood.wordpress.com>

14 years, 5 months

17
39
0 0

Intertec Superbrain

by dennis_mailing_lists＠conus.info

In the middle of 1980s, I was user of Intertec Superbrain computer: http://en.wikipedia.org/wiki/Intertec_Superbrain I found information about it on Dave Dunfield website: http://www.classiccmp.org/dunfield/supbrain/index.htm I still own it, but original diskettes came with the computer are lost. (it was CP/M maybe 2.x but not sure, some BASIC, etc) I found also list of CP/M OS images on Dave's website, but I'm not sure: which one could I take to boot Superbrain? I thought, different CP/M machines have different port mappings or...? And how it is possible to write images to floppy diskettes on PC computer so that Superbrain can boot from them?

14 years, 5 months

7
20
0 0

Need 232 to 60 & 20 mil loop converter thanks

by couryhouse＠aol.com

Need 232 to 60 & 20 mil loop converter thanks cctalk-request at classiccmp.org wrote: >Send cctalk mailing list submissions to > cctalk at classiccmp.org > >To subscribe or unsubscribe via the World Wide Web, visit > http://www.classiccmp.org/mailman/listinfo/cctalk >or, via email, send a message with subject or body 'help' to > cctalk-request at classiccmp.org > >You can reach the person managing the list at > cctalk-owner at classiccmp.org > >When replying, please edit your Subject line so it is more specific >than "Re: Contents of cctalk digest..." > > >Today's Topics: > > 1. Re: teaching programming to kids - Re: Looking for 8080/Z80 > BASIC (Alexander Schreiber) > 2. Re: Books on FP, lambda calculus, closures - Re: teaching > programming (Liam Proven) > 3. Re: teaching programming to kids - Re: Looking for 8080/Z80 > BASIC (ben) > 4. Re: SuperBrain Disks (Chuck Guzis) > 5. Re: Elektor and OSI's OS-65D (was OHIO-DOS) (Eric Smith) > > >---------------------------------------------------------------------- > >Message: 1 >Date: Sat, 28 Jan 2012 18:09:40 +0100 >From: Alexander Schreiber <als at thangorodrim.de> >To: cctalk at classiccmp.org >Subject: Re: teaching programming to kids - Re: Looking for 8080/Z80 > BASIC >Message-ID: <20120128170940.GA32005 at mordor.angband.thangorodrim.de> >Content-Type: text/plain; charset=us-ascii > >On Fri, Jan 27, 2012 at 11:39:19PM -0500, blstuart at bellsouth.net wrote: >> > - and then the place >> > collapses after the last toilet is clogged because you _clearly_ can't >> > expect a PhD to do such lowly work. >> >> Some people *cough*my wife*cough* think it's perfectly >> normal to expect a PhD to wash dishes and take out the >> trash and... :) > >Sounds like a sensible woman ensuring her husbands solid connection >with the ground ;-) > >Kind regards, > Alex. >-- >"Opportunity is missed by most people because it is dressed in overalls and > looks like work." -- Thomas A. Edison > > >------------------------------ > >Message: 2 >Date: Sat, 28 Jan 2012 17:17:44 +0000 >From: Liam Proven <lproven at gmail.com> >To: "General Discussion: On-Topic Posts Only" <cctech at classiccmp.org> >Subject: Re: Books on FP, lambda calculus, closures - Re: teaching > programming >Message-ID: > <CAMTenCGMm5dkiN1XoFr1pLZ4Ejt1-NKL-1UxuoRX7LxDb=4mHw at mail.gmail.com> >Content-Type: text/plain; charset=windows-1252 > >On 27 January 2012 21:50, Tony Duell <ard at p850ug1.demon.co.uk> wrote: >>> There are many different kinds of tech journalism. For starters, there >>> are the basic formal categories: news, news analysis, previews, >>> reviews, comparative reviews, features & columns. Then there is the >>> medium: daily/weekly/monthly. Then there is the audience: >>> nonspecialist/specialist/trade/domain experts. >> >> However, all of those should be accurate and as complete as possible. > >Accurate, yes, for technical stuff, although I'm not sure it applies >to things like comment columns. > >> And >> alas many articles are neither. > >Well, true. Sturgeon's Law says that 90% of everything is crap. > >> THis is not just a computer-related article/book issue. My favourite is >> nothing to do with computer oe electronics. It's that old photographic >> chestnut that the focal length of your camera lens affects the >> perspective of the image... > >O_o > >>> It's not all just one thing. >>> >>> As an outsider, or as a reader, I would not expect people to know or >> >> Maybe not. But I do understand when an article is talking nonsense. > >Well, sure. > >> Look, I am not expecting every article to contain schematics and source >> code. But when I read that 'Uni is a programming language that...' I know >> that the author doesn't know what the hell he is talking about. > >Is this a specific example? I've not heard of a language called "Uni" myself. > >>> understand this, but it's as different as building a packing crate >>> compared to a Chippendale chair. >> >> Sure. But what annoys me is the equivelent of claiming to be making >> Chipendale chairs while actually you're making crates. > >Ah, well, that is a common problem. > >>> I am not going to attempt to defend myself and say that I aim to >> >> As I said, I wasn;t poining my finger at you, or anyone else. I've not >> read any of your articles, so I can't possibly comment on them. But Iv'e >> read a lot of rubbish for other authors... > >If you're curious: > >http://search.theregister.co.uk/?author=Liam%20Proven > >(Yes, you will need web access.) > >>> produce the sort of in-depth technical piece you would want. I am not. >>> I probably never will. But there is a need for things that are at a >>> less formidable technical level than that. >> >> I also feel it's possible to simplify things too much and thus make them >> incomprehensible. >> >> I am interested in telephones and related stuff [1]. ?I read several >> introductory books and found I couldn't understand them. I actually felt >> that the operation of a Storwger exchange was beyond me. And then, by >> chance, I got a copy of 'Telephony'. Volume 2 is about automatic >> echanfes, and it contains full schematics. I spent a couple of weeks >> reading it through, following the operation of overy relay. And it all >> made sense. Yes, it was heavy going, but it was worth it. The >> introductory books were useless. >> >> [1] No, I am not interestiend in gettign free calls, or in listening to >> other people's conversations. I am interesed in the electrical and >> electronic side. To me 'Telephone hacking' doesn't mean what it means in >> the gutter press (to listen to somebody else's calls(, it mans making >> parts for old rotary dial phones from scratch. > >I spent Yule Day at a friend's house in Edinburgh. He collects old >phones and phone equipment. The house - quite big and rambling with a >bunch of guys living there - has an internal switchboard and >extensions in every room, including the bathroom, just for fun. There >is a live, active Strowger exchange in the hall cupboard, and another >in bits in the hall. > >I tried to persuade him to join ClassicCmp - I think he'd fit in well. :?) > >Me, obviously, I'm a fake. I had to whip out my smartphone and look up >what a "strowger exchange" /was./ > >-- >Liam Proven ? Profile: http://lproven.livejournal.com/profile >Email: lproven at cix.co.uk ? GMail/G+/Twitter/Flickr/Facebook: lproven >MSN: lproven at hotmail.com ? Skype/AIM/Yahoo/LinkedIn: liamproven >Tel: +44 20-8685-0498 ? Cell: +44 7939-087884 > > > >------------------------------ > >Message: 3 >Date: Sat, 28 Jan 2012 10:21:49 -0700 >From: ben <bfranchuk at jetnet.ab.ca> >To: cctalk at classiccmp.org >Subject: Re: teaching programming to kids - Re: Looking for 8080/Z80 > BASIC >Message-ID: <4F242EAD.7080207 at jetnet.ab.ca> >Content-Type: text/plain; charset=ISO-8859-1; format=flowed > >On 1/28/2012 10:09 AM, Alexander Schreiber wrote: >> On Fri, Jan 27, 2012 at 11:39:19PM -0500, blstuart at bellsouth.net wrote: >>>> - and then the place >>>> collapses after the last toilet is clogged because you _clearly_ can't >>>> expect a PhD to do such lowly work. >>> >>> Some people *cough*my wife*cough* think it's perfectly >>> normal to expect a PhD to wash dishes and take out the >>> trash and... :) >> >> Sounds like a sensible woman ensuring her husbands solid connection >> with the ground ;-) >> > >PhD see: Please help Dear > >> Kind regards, >> Alex. > > > >------------------------------ > >Message: 4 >Date: Sat, 28 Jan 2012 09:35:52 -0800 >From: "Chuck Guzis" <cclist at sydex.com> >To: "General Discussion: On-Topic and Off-Topic Posts" > <cctalk at classiccmp.org> >Subject: Re: SuperBrain Disks >Message-ID: <4F23C178.2905.150912 at cclist.sydex.com> >Content-Type: text/plain; charset=US-ASCII > >On 27 Jan 2012 at 19:18, Dave Dunfield wrote: > >> Unfortunately the Compustar is not currently working, and will need >> significant work to repair - so I cannot try formatting disks on it. >> And I am unable to create anything on the SuperBrain which I can read >> on the PC. >> >> Which is why I cannot provide disk images for the SuperBrain. I've >> tried - I simply cannot make it happen. > >What I said--the Superbrain tends (evidently, not all revisions do) >to use FA as a DAM. Either edit the raw track to use FBs or use a WD >17xx controller to get the data and rewrite your disk using FBs on a >NEC 765-type controller. > >The Superbrain doesn't care which are used. > >It's not rocket science. > >--Chuck > > > > > >------------------------------ > >Message: 5 >Date: Sat, 28 Jan 2012 09:54:42 -0800 >From: Eric Smith <eric at brouhaha.com> >To: General Discussion: On-Topic and Off-Topic Posts > <cctalk at classiccmp.org> >Subject: Re: Elektor and OSI's OS-65D (was OHIO-DOS) >Message-ID: <4F243662.9050002 at brouhaha.com> >Content-Type: text/plain; charset=ISO-8859-1; format=flowed > >Holger Veit wrote: >> Problem is of course that the Elektor OSI computer uses a rather >> obscure floppy controller and formatting (some GCR emitted by an >> asynchronous 6850 that is hacked into a synchronous mode). >It's FM, not GCR. Of course, it's not IBM-standard FM. Normally it can >only be read and written on an OSI (or Elektor) system. Given how >expensive FDC chips were when OSI designed their floppy controller, I >suppose it can be considered a clever hack, though nowhere near as >clever as Woz's design for the Disk II controller. > > > > > >End of cctalk Digest, Vol 101, Issue 87 >***************************************

14 years, 5 months

1
0
0 0

Elektor and OSI's OS-65D (was OHIO-DOS)

by Paul.Moers＠synopsys.com

Hello Edzard... Let me introduce myself first... My name is Paul, from the Netherlands.. and I'm building the Old Junior Computer from Elektor... The computer is already up and running and now I'm busy with the floppy card.... Final step is a memory card ... The goal is to have the DOS -Junior combination back running... But I'm looking for a version of OS65D...which is very hard to find... Maybe you know some entries where I can get a version of this Operating System....V3.3 of the OS would be nice... Many many many thanks in advance, Paul Moers from Netherlands.

14 years, 5 months

4
3
0 0

TRS80 MDL100 Disk Video Interface Disk

by dave12＠dunfield.com

Hi Guys, I saw that someone was looking for the disk to go with the TRS-80 Model 100 Disk-Video Interface ... This is available on my site. Dave -- dave12 (at) Dave Dunfield dunfield Firmware development services & tools: www.dunfield.com (dot) com Classic computers: http://www.classiccmp.org/dunfield/

14 years, 5 months

2
1
0 0

new haul, serious goodies

by mcguire＠neurotica.com

So a brief truck trip to Maryland netted some really great stuff from an old friend. This is stuff I'd seen before, but he surprised me by saying "hey, bring a truck!" ...so I did, and here's what I came home with: IBM 029 keypunch station, complete and in excellent condition DECsystem-2020 (yes, another one!) DEC RM03 14" disk drive (aka CDC 9762), but sadly no disk packs DEC TU45 magtape drive, in pieces but likely repairable DEC LA120 printing terminal, dirty but in good shape otherwise VAX 8350 w/Unibus, Unibus SCSI, BI-bus SCSI, and CIBCI A few other DEC items, RL02, RX02, small PDP-11/23 system A commercial deli slicer (for my chef fiancee') -Dave -- Dave McGuire New Kensington, PA

14 years, 5 months

11
25
0 0

Dr. Dobb's

by fpersen2000＠yahoo.com

Greetings; Like many of you here I am an old time home computer guy who got his start in 1976 when I built my first computer, an Altair 8800. I am writing to get some information on a number of Dr Dobb's Journals that I wish to sell. I would like some input on what an honest price would be. I am also trying to determine if I should sell these one by one or in volume sets. I have the following: Volume number? Issue # 1??? ??? ???????????????? 1,3,6, 10 2????????????????????????? 1,2,3,4,5,6,7,8,9 3????????????????????????? 2,5,6,7,8,9,10 4?????????????????????????? 1,3,4,6,7,8,9,10 5?????????????????????????? 1,2,3,4,5,6,7,8,9,10 6?????????????????????????? 1,3,4,5,6,7,8,9,10,11,12 7??????????????????????????? 2 Your input would be appreciated.

14 years, 5 months

15
26
0 0

closures, FUNARGs, and lambdas [was RE: teaching programming to kids - Re: Looking for 8080/Z80 BASIC]

by RichA＠vulcan.com

From: Tony Duell Sent: Friday, January 27, 2012 1:21 PM [NB: Tony trimmed out the identities, so I'm not going to try to remember them.] >>> This is something I know nothign about either, and it would >>> certainly help _me_ if somebody could explain what lambda calculus >>> and 'closures' are useful for. >> The lambda calculus is useful in the same way that any theoretical >> discipline is useful. It does not itself solve problems; it informs > Actaully I think a lot of theoretical concepts were originally > develloped to solve particular real problems. They may well have other > applciations, of course. In point of fact, closures were often referred to in the early LISP literature as "FUNARGs" ("functional arguments"), and their existence went by the name "the FUNARG problem." There is a famous paper by Joel Moses of MIT entitled "The Function of FUNCTION in LISP, or Why the FUNARG Problem Should be Called the Environment Problem" which discusses them quite clearly using an ALGOL-style syntax for the non- LISP programming audience. Available at http://dspace.mit.edu/bitstream/handle/1721.1/5854/AIM-199.pdf The late John McCarthy has been quoted as saying that LISP is the way it is because of his misunderstanding at the time of the lambda calculus. Stop trying to understand the latter to understand LISP, and you'll be way ahead. Rich Alderson Vintage Computing Sr. Systems Engineer Vulcan, Inc. 505 5th Avenue S, Suite 900 Seattle, WA 98104 mailto:RichA at vulcan.com mailto:RichA at LivingComputerMuseum.org http://www.LivingComputerMuseum.org/

14 years, 5 months

1
0
0 0

Forlorn hope for a TRS-80 Reimplementation

by alhartman＠yahoo.com

The eBay seller never shipped the Model III I won on eBay after 11 days, so I requested a refund. I left negative feedback (his third in a year) and he got nasty. I told him that not shipping an item that was paid for wasn't deserving of any but negative feedback. He felt that not shipping the item and refunding m money was a positive transaction... *sigh!* Model III's and 4s are selling from between $400 and $2400 on eBay. These sellers are mad. I can't say how many Model III's I saw at the old TCF flea markets for $25.00, stacked 3 or 4 deep. Wish I had bought one... My Model I is still toast, and my LNW-80 is too big and heavy to setup and use given my tiny working space. If not for the need to read/write 5.25" floppies, I'd use a small footprint PC and an emulator. The only 5.25" USB solution (http://shop.deviceside.com/prod/FC5025) is read-only, It doesn't support TRS-80 Model I/III/4 formats in any event. I enjoy seeing all these classic computer re-implementations like Vince Briel's Replica I, or the DTV C-64 joystick... I wish someone would reimplement a TRS-80 Model I/III/4 in a chip, like the DTV. There's nothing special about the Model I really, other than maybe the WDC disk controller chip. The Model III is little different, it's only the Model 4 with Hi-res graphics and such where it gets more complicated. A fellow in Australia wrote to me years ago that he was working on one, but I never heard back from him. in the early 90's there was a board that basically replaced the Model I system board and put a full Model III in the case. It was called a "Trash Compactor." I wish I had bought one on those... If anyone knows of such a project, let me know. Or, if you know of a Model I, III or 4?(preferred in reverse order) in the mid-New Jersey area available for sale or trade at a price someone on a fixed income can afford. I would have thought SOMEONE would have made a universal USB to floppy drive adapter that one could use to add a 5.25" drive (or a 3.5") like all of the ATA/SATA adapters out there. I'll keep checking eBay for a machine, I found the LNW-80 (only a Model I, not the Model II which has CP/M and 80 columns) after searching a long time. So, I haven't given up hope. Thanks! Al Hartman Keansburg, NJ

14 years, 5 months

6
9
0 0

Fwd: Re: [GreenKeys] Model 33 For Sale (also 33 covers for sale)

by jfoust＠threedee.com

>From: Keelan Lightfoot <keelan at grenander.com> >Date: Thu, 26 Jan 2012 22:27:32 -0800 >To: Steve Ripper <steveripper at comcast.net> >Cc: "<GreenKeys at mailman.qth.net>" <GreenKeys at mailman.qth.net> >Subject: Re: [GreenKeys] Model 33 For Sale > >The vintage computer guys will be all over it, I'm sure. > >- Keelan > >On 2012-01-26, at 5:17 AM, "Steve Ripper" <<mailto:steveripper at comcast.net>steveripper at comcast.net> wrote: > >>Model 33 for sale in Wexford, PA. Starting bid at $79. Looks to be in very good condition and complete. >> >><http://tinyurl.com/7rs4q3l>http://tinyurl.com/7rs4q3l >> >>If someone in the group is going after this please let the others know. No sense in stepping on each other toes! >> >>Cheers, >> >>Steve Ripper >><mailto:steveripper at comcast.net>steveripper at comcast.net >><mailto:steve.ripper at gmail.com>steve.ripper at gmail.com >>248-787-0705 >><image002.jpg> >> Subject: [GreenKeys] Model 32/33 Covers - New X-BeenThere: greenkeys at mailman.qth.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: "Discussion of older radio teletype $RTTY$ gear " <greenkeys.mailman.qth.net> List-Unsubscribe: <http://mailman.qth.net/mailman/listinfo/greenkeys>, <mailto:greenkeys-request at mailman.qth.net?subject=unsubscribe> List-Archive: <http://mailman.qth.net/pipermail/greenkeys> List-Post: <mailto:greenkeys at mailman.qth.net> List-Help: <mailto:greenkeys-request at mailman.qth.net?subject=help> List-Subscribe: <http://mailman.qth.net/mailman/listinfo/greenkeys>, <mailto:greenkeys-request at mailman.qth.net?subject=subscribe> Content-Type: multipart/mixed; boundary="===============1937634989737752974==" Sender: greenkeys-bounces at mailman.qth.net Errors-To: greenkeys-bounces at mailman.qth.net X-Spam-Status: No, score=-1.9 X-Spam-Score: -18 X-Spam-Bar: - X-Ham-Report: Spam detection software, running on the system "echo.gendns20.com", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: FYI: Someone on ebay is selling brand new covers for what I believe are the model 32/33 without the tape reader / punch. Asking $75 each and has more than 10 available. [...] Content analysis details: (-1.9 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (steveripper[at]comcast.net) -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] 0.0 HTML_MESSAGE BODY: HTML included in message -0.0 AWL AWL: From: address is in the auto white-list X-Spam-Flag: NO FYI: Someone on ebay is selling brand new covers for what I believe are the model 32/33 without the tape reader / punch. Asking $75 each and has more than 10 available. I have no connection or interest in this auction. <http://tinyurl.com/7u45ulj>http://tinyurl.com/7u45ulj Cheers, Steve Ripper

14 years, 5 months

1
0
0 0

My PDP11/23 arrived...

by bqt＠softjar.se

On 2012-01-24 05:34, allison<ajp166 at verizon.net> wrote: > Special note early RQDX2s must be in the last unoccupied slot, they do > not pass the > bus grant signals. As far as I can remember it's (only) the RQDX1 that have this problem, but it applies to *all* RQDX1. Johnny -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt at softjar.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol

14 years, 5 months

10
15
0 0

Identify: IBM memory

by pontus＠Update.UU.SE

Hi This link is making the rounds: http://gizmodo.com/5878645/this-giant-chunk-of-metal-is-4-kilobytes-of-memo… But what type of memory is it? Delay line, CRT tube, Drum? Bonuspoints if the machine can be identified :) Cheers, Pontus.

14 years, 5 months

11
21
0 0

looking for a Wombat or other Apple ][ clones or components

by chrism3667＠yahoo.com

The Wombat. In 1984 an Australia court sided against Apple (apparently the manufacturer copied their roms) stating there was no basis for copyright infringement because it wasn't a literary work LOL LOL LOL LOL

14 years, 5 months

1
0
0 0

looking to acquire a TI Business Pro

by chrism3667＠yahoo.com

Not a TI Professional, already have those. It's a 286 based tower. I have an old contact, but it belongs to an expired domain.

14 years, 5 months

1
0
0 0

Thank You All re Boot PROMs!

by mcquiggi＠sfu.ca

Thank you everyone for your replies! Thanks Pete, nice to see you still in the hobby! I see some other old names here too. Kevin Message: 13 Date: Thu, 26 Jan 2012 00:36:05 +0000 From: Pete Turnbull <pete at dunnington.plus.com> To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> Subject: Re: DEC Boot PROMs; Looking for Old PROM Programmer Message-ID: <4F209FF5.6090609 at dunnington.plus.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Kevin McQuiggin wrote: > I have been lurking for several years, although I was quite active in > the retrocomputing community before that. > > Work and other pleasures kept me a bit inactive until my retirement > last summer. Just coming up for air! Welcome back, Kevin! -- Pete Peter Turnbull Network Manager University of York

14 years, 5 months

1
0
0 0

Dimension 68000

by chrism3667＠yahoo.com

In the unlikely event someone has in their possession one of these, please send me a private email. And of all ironies, I need to know it's dimensions...

14 years, 5 months

1
0
0 0

How many DECwriters were sold?

by legalize＠xmission.com

How would I find out how many DECwriters (model I, II or III) were made or sold? Did any sales data numbers from DEC ever make it into some sort of historical archive? -- "The Direct3D Graphics Pipeline" -- DirectX 9 version available for download <http://legalizeadulthood.wordpress.com/the-direct3d-graphics-pipeline/> Legalize Adulthood! <http://legalizeadulthood.wordpress.com>

14 years, 5 months

2
1
0 0

Just a link, Theodor Nelson 1974

by rdawson16＠hotmail.com

http://www.newmediareader.com/book_samples/nmr-21-nelson.pdf If I embarrass myself to the knowledgeable crowd, apologies. Autodesk bought his line and Xanadu Operating Company Its claimed he coined 'hypertext' in mid 60s

14 years, 5 months

9
9
0 0

Want a 9-track repair business?

by jfoust＠threedee.com

I had three 9-tracks I'd picked up a few years ago. None worked out of the box; they collected dust. Last weekend I knew I'd pass by http://www.comco-inc.com/ in Bettendorf, Iowa, one of the few 9-track sales and service places I'd found. I didn't have much advance warning, so I just brought the drives with me and left them at his door step because the shop was closed. I left an M4 9914, an Overland Data 5622, and an HP 88780. Diagnosis is $495, deductable from repairs if I proceed. Ouch! He says he still sells "a few" 9-tracks a year. His offer to me was a reconditioned HP 88780 for $1795 including manual, cleaning pads and a scratch tape. He said "BIG IDEA... Here's a wonderful chance to corner the 9-track business: I'll sell you 1000 lbs of parts for $1,000 (FOB Bettendorf). I'll even throw in graphics, manuals, etc. At the very least, you will be able to build several drives. I am not kidding." The building he's in has a commercial real-estate "for sale" sign out front. Maybe he was a renter and he needs to move. - John

14 years, 5 months

5
6
0 0

"Qualtum hard drive Novelty"

by aek＠bitsavers.org

http://www.ebay.com/itm/320835328368 Why would someone even pay the listing fee for this bit of stupidity?

14 years, 5 months

10
9
0 0

BYTES wanted, pre-1990

by chrism3667＠yahoo.com

And yes that does render them vintage dag nabbit! I'm not too proud to accept donations (I'll pay the media rate postage of course). PO could give you a hard time (ooh they contain advertising, can't claim media rate. Kindly explain that 22 year old advertising doesn't count). I could pay a buck or so per though (except the real oldies, I'm sure I could do better). Just no onesies or twosies. I'll go barkrupt trying to complete my set.?

14 years, 5 months

2
2
0 0

My PDP11/23 arrived...

by oe5ewl＠gmail.com

Hi all, finally I got my real Iron delivered. I nearly can't express how happy I am about that. Now the usual Inspection begins (PSUs etc...) Could please one of you have a look at my "board-layout" in the backplane and correct me if I am completely wrong? >From top downwards I would insert the modules as follows: M8189 - 11/23 -CPU M8067 - MSV-11 - 256 KW RAM M8043 - DLV11 - Quad Serial Card M8061 - RLV12 - RL02 Controller M7516 - DELQA - Ethernet Card Goal is to bring this System up with VTSERVER for starters. I hope to add one or two RL02s in Summer. A RX50 and a RD50/51 or 52 (don't remember at the moment) are sitting on my shelf too and I'd like to put them in there. But first I have to get a controller for that. This all sounds like quite an amount of work and a lot of fun for me :) Regards, Wolfgang - who wanted to share his happiness -- Wolfgang Eichberger - OE5EWL Operating System Collector Blog: 5ewl.blogspot.com Homepage: www.eichberger.org

14 years, 5 months

9
23
0 0

Some PDP11 related Questions..

by bqt＠softjar.se

On 2012-01-25 19:00, Holm Tiffe<holm at freibergnet.de> wrote: > allison wrote: > >> > On 01/25/2012 06:40 AM, Holm Tiffe wrote: >>> > >Hi, >>> > > >>> > >I have A M8186 (KDF11-A Rev D) and an M8047-CA (MXV11-AC) currently in >>> > >an H9275 Backplane. >>> > >I've fiddeled around an wondering why I can't access the ROMs on the M8047 >>> > >at 173000. Finally found it, they get active ad 773000 in the ODT, since >>> > >the M8047 is using the BBS7 Signal from the CPU to decode the ROM Address. >>> > >My question is now regarding the Bootstrap setting, the Manual says that in >>> > >ODT mode the BDAL16 and BDAL17 are enabled to get access to the higher >>> > >memory contents. How is this handeled while bootstrapping? I can't set a >>> > >bootstrap address of 773000 on the KDF11, it boots now in ODT Mode and >>> > >displays 173000 after Reset, thati's the jumpered address. >>> > >How is this (BBS7) handeled while bootstrapping? Is the BBS7 low while >>> > >bootstrap at 173000 or is the M8047 incompatible with this processor? >>> > >(I've not tested to bootstrap since I don't know what is in the ROMs and I >>> > >don't have an RX02 nor TU58 to connect, want to put in a M7555 so I have to >>> > >change the ROMs for sure). As far as I know this KDF11 should be able to >>> > >handle 22 bits (420HD0 on the Handle, 5013326 D-P4 on the Board) is that >>> > >the case? >> > >> > Most all KDf11s are Q22 make sure both of the hybrid chips are there the >> > second >> > one has the MMU for the 22 bit mapping! >> > >> > Also make sure the backplane is Q22. >> > >> > Lastly the M8047 make sure its jumpered correctly. If the boot in it >> > fails due to lack of device I think the report is 173003?. >> > >> > ODT only knows 16bit octal. And BBS-7 is activated when the upper three >> > address bits are active for addresses greater than 160000 which is IO >> > and boot address space. > Yes, but I mean the difference between 773000 vs 173000. > I see the ROMs in ODT at 773000 but not at 173000! > Anyway, I'll jumpering the CPU to bootstrap and will look what happens. Here is how it actually works: When the CPU is addressing anything in memory, it goes through the MMU. Always. However, the MMU can act in three different modes. 16-bit 18-bit 22-bit In 22-bit mode, all CPU accesses are virtual addresses, and they get translated by the MMU into other 22-bit addresses. Pretty straight forward. In 18-bit mode, all CPU accesses are also virtual addresses, and they get translated by the MMU into 22-bit addresses. Only part of the PAR registers are used. However, memory access to addresses in the high 4kW are mapped to the high end of the 22-bit address range, even though you only have 18-bit addresses. In 16-bit mode, all CPU accesses are physical addresses. However, the MMU recognize addresses in the high 4kW of the address space, and move those accesses to the high 4kW of the 22-bit address space. Next is the BBS-7 signal, which is active if the physical address then is above 17760000. Anything in the I/O page should never decode the A21-A13. BBS-7 will be the logical AND of A21-A13. In fact, it might be that BBS-7 is shortcircuited inside the MMU, and the MMU don't even drive A21-A13 when you are in 16-bit or 18-bit mode. Anyway, the ROMs are *not* at 173000, if you talk about 22-bit or 18-bit addresses. They are at 173000 if you talk about 16-bit addresses only. In short, they are at address 13000 in the I/O page. Wherever your I/O page is. If you enable 22-bit addressing, and put the I/O page at page 0, the ROM memory will appear at virtual address 13000, really. I hope this makes things clear. Otherwise feel free to ask. It's really not that complicated. >>> > >Next question about RAMs: I do have some QBUS Memory boards with PMI >>> > >connectors (M6708, NatSemi NS638, Chrislin CI-MV8 to be concrete) does >>> > >anyone know if I can use one of them with the KDF11 (or at least the >>> > >KDJ11?) I hve a KA630 too, but I need PDP11 RAM, the 16KW on the M8047 >>> > >is really a bit small.... >>> > > >> > PMI can be used with KDJ11 if its the right PMI. KA630 is not PDP11 but it >> > is microVAX. > Yes, know this. But what's the right PMI for the KDJ11? > I have soldered an additional Megabyte to the KDJ11 and it has now 1,5MB, > which is enough tu run 2.11BSD, therefore I don't have tried to use one of > the memory Boards additionally until now. No. It is not compatible. The PMI memory for VAXen does not work the same way as PMI memory for PDP-11s (even those that do have PMI memory). VAX PMI uses a flat cable between the CPU and the memory boards. PDP-11 PMI memory uses signals in the CD slots to communicate with PMI memory. In addition, for VAXen, PMI is used to be able to address more than 4 MB as well as speed, while on the PDP-11 PMI memory only have PMI for the speed gains, as a PDP-11 cannot address more than 4 MB anyway. Also, the PDP-11 PMI memories works just fine as any normal Qbus memory. It only acts as PMI memory under some specific circumstances, else it's just normal Qbus memory. VAX PMI memory does not work as normal Qbus memory under any circumstances, as far as I know. If you want the designation for the KDJ11 PMI memories, just search through the field guide that is on the internet. Johnny -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt at softjar.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol

14 years, 5 months

1
0
0 0

Some PDP11 related Questions..

by holm＠freibergnet.de

Hi, I have A M8186 (KDF11-A Rev D) and an M8047-CA (MXV11-AC) currently in an H9275 Backplane. I've fiddeled around an wondering why I can't access the ROMs on the M8047 at 173000. Finally found it, they get active ad 773000 in the ODT, since the M8047 is using the BBS7 Signal from the CPU to decode the ROM Address. My question is now regarding the Bootstrap setting, the Manual says that in ODT mode the BDAL16 and BDAL17 are enabled to get access to the higher memory contents. How is this handeled while bootstrapping? I can't set a bootstrap address of 773000 on the KDF11, it boots now in ODT Mode and displays 173000 after Reset, thati's the jumpered address. How is this (BBS7) handeled while bootstrapping? Is the BBS7 low while bootstrap at 173000 or is the M8047 incompatible with this processor? (I've not tested to bootstrap since I don't know what is in the ROMs and I don't have an RX02 nor TU58 to connect, want to put in a M7555 so I have to change the ROMs for sure). As far as I know this KDF11 should be able to handle 22 bits (420HD0 on the Handle, 5013326 D-P4 on the Board) is that the case? Next question about RAMs: I do have some QBUS Memory boards with PMI connectors (M6708, NatSemi NS638, Chrislin CI-MV8 to be concrete) does anyone know if I can use one of them with the KDF11 (or at least the KDJ11?) I hve a KA630 too, but I need PDP11 RAM, the 16KW on the M8047 is really a bit small.... Next question is about an M7656 Graphic board that I have laying around here. Where was this used and are there any docs available? Regards, Holm -- Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe, Freiberger Stra?e 42, 09600 Obersch?na, USt-Id: DE253710583 www.tsht.de, info at tsht.de, Fax +49 3731 74200, Mobil: 0172 8790 741

14 years, 5 months

6
12
0 0

FYI: USB <-> IEEE-488 bridge

by legalize＠xmission.com

This looks good. Imma be gettin' one. <http://www.sparkfun.com/products/549> There's also an ethernet version (instead of USB) <http://www.sparkfun.com/products/8841> -- "The Direct3D Graphics Pipeline" -- DirectX 9 version available for download <http://legalizeadulthood.wordpress.com/the-direct3d-graphics-pipeline/> Legalize Adulthood! <http://legalizeadulthood.wordpress.com>

14 years, 5 months

2
1
0 0

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

1997

test-drb