test-drb

test-drb@ccmp.vtda.org

101090 discussions

by lynchaj＠yahoo.com

On Sunday 23 March 2008 18:06, Andrew Lynch wrote: > Hi, > > I found a mystery chip in a pile of stuff. Apparently, it was an AWARD > BIOS in a former life. I can read it in my EPROM programmer and it is read > compatible with a 27C512 (64Kx8 EPROM). The contents are consistent with > an AWARD BIOS for a PC of some sort. > > However, the chip itself is rather unusual. There is no EPROM quartz > window, the manufacturer symbol is a triangle, and the number is unlike > anything I have seen before. Worse yet, I get no helpful hints on GOOGLE > when I try. > > The chip number is 608C62. I am guessing it is either a One Time PROM or a > mask ROM. Has anyone heard of this or know what family it is from? > I found it on www.datasheets.org.uk - it's listed as an equivalent to a 6264 static ram, which sounds plausible... Julian > I am hoping it was a FLASH ROM or EEPROM but I can't seem to find anything > on this chip. Any hints or help much appreciated! > > Andrew Lynch > -----REPLY----- Hi Julian, Thanks for looking and the reply. That is the first place I went after Google looking for a datasheet. The only thing they said though was that I was not the only person who has searched for the device in the past. The chip is some sort of ROM because I can read the contents with my EPROM programmer in 27C512 mode. No luck on what it is though... At least it is not unique but it is starting to look a lot like a Mask ROM to me. Thanks! Andrew Lynch

18 years

mystery chip 608C62

by lynchaj＠yahoo.com

On Sunday 23 March 2008 18:06, Andrew Lynch wrote: > Hi, > > I found a mystery chip in a pile of stuff. Apparently, it was an AWARD > BIOS in a former life. I can read it in my EPROM programmer and it is read > compatible with a 27C512 (64Kx8 EPROM). The contents are consistent with > an AWARD BIOS for a PC of some sort. > > However, the chip itself is rather unusual. There is no EPROM quartz > window, the manufacturer symbol is a triangle, and the number is unlike > anything I have seen before. Worse yet, I get no helpful hints on GOOGLE > when I try. Maybe this'll help: http://www.classiccmp.org/rtellason/logos/semiconductorlogos.html ? A triangle sounds like Matsushita, maybe. > The chip number is 608C62. I am guessing it is either a One Time PROM or a > mask ROM. Has anyone heard of this or know what family it is from? I've not heard of that one before. > I am hoping it was a FLASH ROM or EEPROM but I can't seem to find anything > on this chip. Any hints or help much appreciated! > > Andrew Lynch -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, a critter that can be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin -----REPLY----- Hi Roy, Thanks for the reply. I reviewed your page of chip logos and the Hundai/Hynix triangle seems the closest but even then not exact. The logo is a perfect equilateral triangle outline. Thanks! Andrew Lynch

18 years

advent sources?

by tiggerlasv＠aim.com

I'd love to find an Advent fortran source that compiles on the PDP-11 under RSTS/E. I've run across about 20 different versions in various places on-line, but haven't been able to get any of them to compile successfully under Fortran-IV or Fortran-77. . . Zane -- When you say "DND", do you mean DND, as in Lamorte/Shvenk's Lair style DND, or do you mean DUNGEO, as in "You are standing in an open field west of a small white house." ? T

18 years

NRI 832 restoration.

by davis＠saw.net

I've started restoring a National Radio Institute (remember the 60's pop-sci ads?) model 832 computer.The system was functional when I received it about 15 years ago, but it's showing it's age now.This system is very fragile, All the signal connection use 22-24? gauge kynar, tack soldered to the edges of machine screw sockets, the sockets being used to test and experiment with the dozen+ circuit boards constructed during the training program. I've looked on the net and can find close to nothing on this machine. Does anyone have schematics?or do I need to tear this thing down and draw up a decent print? Thanks. Jim.

18 years

cassette interface of Panasonic HHC

by eric＠brouhaha.com

Can anyone provide a summary of how to use the cassette interface on a Panasonic HHC (or Quasar, etc.)? I don't have the relevant manuals. I expect that there must be some way to transfer files between memory (either internal RAM or external RAM modules) and the cassette, but it's not obvious how to do it, and the I/O menu doesn't list the cassette interface. Thanks, Eric

18 years

End of restoration of the early French computer SEREL ODP-505 (germanium CPU)

by pichotjm＠free.fr

Hi,[back to home]> It is difficult for me to give a precise date. I don't have any > manufacturing notes/schematics about this machine. Published > computer lists > indicate 1965. But they don't know my work. It seems that the > machine began > a military career, before a commercial one. (My machine has a military > color, and a customs seal)And I think that the 1965 date is only for > commercial use (not reserved to military).Date codes on PCBs range > from 1962 > to 1964. It's why I think 1964. But the machine was used for > manufacturing > problems debugging / ECN. 1964 may be the date of the last ECN... > So the > date is between 1962 and 1965. | Thank. I presume ECN means PCB = Printed Circuit Board. ECN: Engineering change notice. Indicates revision of PCB. > |It is tiny compared with my Germanium machine > (ICT 1301) which weighs > |five tons. It has the same clock speed but is quite a bit slower, so > |I guess it is earlier than mine. But maybe the emphasis of the design > |was miniaturisation and the designers traded speed for size. > | | I should have made it clear that it is the 1301 which is the faster | of the two. For example a 48 bit decimal (i.e. 12 digits) add to / | subtract from a register takes 21 microseconds. The ODP-505 is a pure binary machine, not designed for arithmetics, statistical purposes or BCD computations.It is a real time (!!!) computer. Get some datas (voltages, frequencies, switch states, motor speed, temperature...) compare to thresholds or values, and speed up / slow down motor, or move a cadmium bar (?) in a nuclear reactor...> What is the manufacturing date of your ICT 1301? | Actually I have two. Serial number 6 was the first one to be sold and | was installed in 1962 and it is this one which is assembled and | works, though not all the peripherals are functional. Serial number | 75 I would guess was made in 1963. I have a few parts of serial | number 155, which I would think would be from 1965 when the machines | were largely replaced by the ICT 1900 series. Designing of the | machines was started in the late 1950s, and many of the engineering | drawings have initial revisions from that period. | The architecture of your machine reminds me of the first machine I | was allowed to operate. It was an 18 bit binary machine, it had 8k of | memory built in, expandable with external modules and was made by the | Airborne Computing Division (ACD) of Elliotts, it was an Elliott 920B | and was a compact, flyable version of the commercial Elliott 903. | There had been an earlier model 920A which I think would have been | Germanium and was roughly the size and shape of a carpenters work | bench. This may have been contemporary with your earlier machine I | think. Unfortunately I never saw one in the flesh, but there was a | bench in the computer room which I found out later, was the empty | chassis of a 920A. Behind the bench was a large panel full of | electrical 'chocolate strip' connectors where the analogue and | digital input and output signals of the 920A could be connected up. | Apparently some of the analogue outputs had been connected up to an | oscilloscope to provide a visual display unit, though it used a fair | bit of processor time to keep it refreshed, even with the long | persistence phosphor of an oscilloscope. The panel had been covered | with board with pegs to hold mylar paper tapes and until the day it | was scrapped I had not seen what was behind it. Very interesting!There are some video connector in the earlier machine and the Serel companywas specialized in high tech video solutions. I have read somewhere in docs, thatthis computer have a screen output...I have found, last week a small notice describing microprogramming on ODP-505.http://pichotjm.free.fr/Serel/ODP505/MicroProgrammation/MicroProgrammation.html(doc found in photomultiplier doc!)I have found commercial document describing displays and analog memories...I don't know the date... (1970?) I have to study these documents... > I have a > earlier machine from the same company SEREL, named OA-1001. Built in > 1959/1960.I need to restore it. It lays on the floor (horizontal > position)... The blue one > here:http://pichotjm.free.fr/Serel/Photos/Photos.htmlI will start > restoring > next month (with the Sun!) | What is involved in the restoration? Do you intend to make it work, | this would be very hard without the schematics.As you know, i am alone, here. I want to make an esthetic restoration:Photos and notes, dismantle, photos and notes, wash, dry, fix the rust, protect with Rustol, photos an reassemble. I hope to be capable to do that... may be one year, may be two... May be some reverse engineering to get 2 or 3 schematics. (need one week for a board! I have 2 boards in process...)JM Pichot

18 years

End of restoration of the early French computer SEREL ODP-505 (germanium CPU)

by pichotjm＠free.fr

|pichotjm wrote: | |> Hi, Be carefull! fr.comp.ordinosaures is in french. | |And this is somehow dangerous for my health :-) | |> The best way for you, |> would be to subscribe to the news server Astraweb.com. You will have |> to pay | |Actually an unrelated google search showed up "ordinosaure" on |the French wikipedia and the very next link was google groups |(or dejanews as I still like to think of it). | |56000 messages ... I may be some time ... | |Antonio [back to home] Hi, 'Ordinosaure' is a beautiful new word composed with 'Ordinateur' (computer) and Dinosaure. We could translate it by 'computosaure'. It has about the same definition as in this group: older than 10 years. (I would prefer more than 20 or 30 years, to minimise the use of the word...) In 56000 messages, you will find a lot without interest! If you need some french url, i can make a copy of my book-mark. JMP

18 years

Loading an OS onto a real PDP-11 - not an emulator

by tiggerlasv＠aim.com

> With dual RL01's you're going to be fairly limited on space, > I don't know how old of a version of RSTS/E you'd need > to go with in order to get it to fit. RT-11 is a good choice > for a system with that limited of disk space. RSTS/E V7.0-07 will happily reside on a single RL01 pack. Depending on the program packages you install, you could wind up with as much as 3MB of space free. Add another RL01 as a public pack, and you're "living large". ;-) His real limitation will be the amount of memory on the 11/34. If he's got 256K, then he'd be able to run between 2 - 4 maximum size jobs without swapping, depending on the size he sets for SWAPMAX. T

18 years

608C62

by cclist＠sydex.com

> Date: Sun, 23 Mar 2008 18:06:27 -0400 > From: "Andrew Lynch" > Subject: mystery chip > I found a mystery chip in a pile of stuff. Apparently, it was an AWARD > BIOS in a former life. I can read it in my EPROM programmer and it is > read compatible with a 27C512 (64Kx8 EPROM). The contents are consistent > with an AWARD BIOS for a PC of some sort. Well, if it's an EPROM (OTP or flash), it should have a "silicon signature"/"intelligent identifier" readable by your EPROM programmer. Does your programmer have an auto-identify capability? Cheers, Chuck

18 years

partnumber(s) of a TC-11

by quapla＠xs4all.nl

Hello, Can abyone help me with the partnumber or partnumbers of a TC11 controller (which is for the TU-56 tapedrives). Thanks, Ed

18 years

Computer in 1900

by bnansel＠bigpond.net.au

Thu Feb 14 Gavin Melville wrote: > ... > As the OP who started this discussion I appreciate all the comments. > The original spec was not to invent new components, but to use things > you could actually get in 1900. Just because I know how to make > an IC > now doesn't mean I could have made one in 1900. While I could have > obtained Silicon, it's unlikely it would have been usable purity, and > the imaging, etching and depositation would be simply impossible. > > The "was it available" we have looked hardest at is the transistor, > and > could have we made a point contact transistor then, even a FET (made > before the transistor but didn't recognise it). While we might be > able > to do this, we're trying to limit our search to things we could get, > rather than make, or materials we could get rather than make ie iron > cores, as opposed to point contact transistors. ( We are, however > keeping an eye on the 256 2n2222 project). > ... As an option for I/O, you might consider a Nipkow (pronounced 'Nip- kov') disk as a mechanical video display unit. Nipkow disks were well known in 1900, and several television designs had been proposed by then (and some of them even had much, much more than a snowball's chance of working). Another thing you might consider is to use a nickel coating on the disk; with suitable read & write heads you could build a sort of bit- mapped video memory. Poulsen had demonstrated magnetic recording in 1898, and it was used in some early Marconi equipment as a detector. A sensitive mirror galvanometer connected to the read head would modulate your light source behind the scanning disk. You need to write the appropriate bit images to the tracks, but assuming the disk spins at about 1500 RPM, you only need modulate at audio frequencies to produce usable video; you could use a carbon amplifier (as used by the phone company at that time) to drive each write head. Another thing magnetic recording might do for you is as a source of higher frequencies: prerecord at slow disk RPM, read at much higher RPM. -Bobby

18 years

mystery chip 608C62

by lynchaj＠yahoo.com

Hi, I found a mystery chip in a pile of stuff. Apparently, it was an AWARD BIOS in a former life. I can read it in my EPROM programmer and it is read compatible with a 27C512 (64Kx8 EPROM). The contents are consistent with an AWARD BIOS for a PC of some sort. However, the chip itself is rather unusual. There is no EPROM quartz window, the manufacturer symbol is a triangle, and the number is unlike anything I have seen before. Worse yet, I get no helpful hints on GOOGLE when I try. The chip number is 608C62. I am guessing it is either a One Time PROM or a mask ROM. Has anyone heard of this or know what family it is from? I am hoping it was a FLASH ROM or EEPROM but I can't seem to find anything on this chip. Any hints or help much appreciated! Andrew Lynch

18 years

FTGH: Stuff!

by josefcub＠gmail.com

All, Long story short, I have a bunch of stuff that I can't currently properly take care of. I'd like it to go to homes that can use it, or at least protect it better. I live in semi-rural Texas (Bastrop, TX about 50mi east of Austin). Things listed here are technically "classic", even if there's only one minicomputer involved. I also have myriad miscellaneous PC junk that can happily go too. I'd love to have traded this stuff for repairing/refurbing my workshop, but that's not likely going to happen. This stuff is pickup only, due to size, weight, and time constraints on my part. Take one thing, or take it all. Just take it and preserve it, please. (I will part out the DG though, if you take the innards and I keep the non-OEM racks) So here's the list for all y'all: * Twin rack HEAVY Data General MV-7800/U minicomputer, with: Overall Condition: Slight external rust, racks in good shape, boards clean and intact. Last powered up in 1993. Been in uncontrolled storage since. Card List in Nova 4 CPU enclosure: 16 15 40 ISC 14 27 BMX-1 DISK 13 22 WP TAPE 12 11 10 50 SLIM-16 (16-terminal communications card) 09 65 SLIM-16 08 17 DMA-LPT 07 06 05 04 03 02 ( DAUGHTER BOARD 8MB ) 01 MV-7800 CPU 2MB Tape Drive: Cipher Data Systems MOD NO: 0910640-98-0750U PART NO: 154000-132 OPTION: B DENSITY: 1600/800 bpi HDDs (x2): Century Data Systems Model: M315-1 Serial: 12718 / 11096 Part #: 26723-248 REV: AW * Apple Macintosh SEs (x2) 2.5MB and 4/20MB models, keyboards and mice if I can find 'em. * Apple II Plus: 48k+Language card, works. * Apple IIe: works * Apple IIc Plus: Works * Apple Monitor IIc: Works * Apple IIgs (x5 or so): Various memory configurations, all worked when put up. 2 Woz, one Rom 00. * A small army of Apple II 8-bit expansion cards, Disk II drives, and other parts. * TI-99/4A: A dozen carts, speech module, CPU in original box. Works. * Apple Monitor IIgs x2: Worked last I used them. * DEC DECStation 5000/120 with 5000/260 front cover. Works. 32MB/1GB. * TRS-80 Model 16 with twin 8" drives, keyboard, printer. Untested. * More as I find it. With this stuff gone to better homes, I can spend the money and time making a real workshop out of the mess, so I can collect, repair, and use the stuff I love once again. Josef PS: You'll have to seriously barter for my spare Newtons, Model 100s, Epson PX-8s, and VAXstation 3100 M38. Those are at least kept in the house. ;-) -- "I laugh because I dare not cry. This is a crazy world and the only way to enjoy it is to treat it as a joke." -- Hilda "Sharpie" Burroughs, "The Number of the Beast" by Robert A. Heinlein

18 years

Fwd: [Electronics_101] Parts

by rtellason＠verizon.net

This guy has a bunch of 74xx parts, including some numbers that I just sent the last of what I had to a listmember here. :-) Some other bits too, some of you guys might find useful. ---------- Forwarded Message ---------- Subject: [Electronics_101] Parts Date: Sunday 23 March 2008 04:48 From: "Ben" <izzo47 at yahoo.com> To: Electronics_101 at yahoogroups.com Where is a good place to post for parts that I am getting rid of?? I made a website => http://mysite.verizon.net/vzeszd6i/bensplace/ Thanks, Ben http://groups.yahoo.com/group/Electronics_101/ ------------------------------------------------------- -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, ?a critter that can be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin

18 years

About Atari UNIX

by plamen＠r00tcrew.eu.com

Hello, I'm writing you because I saw a message in classiccmp.org about Atari UNIX. >> "For those who own Atari TT030 workstations, I have finally gotten a >> hard >> disk with Atari's version of Unix System V on it running along with a >> diskette with setboot.prg utility that sets the nvram in the TT030's to >> recognize and boot from the Unix Hard Disk. >> >> If anyone is interested, I can make ghost images of the 300MB SCSI >> hard disk >> for you. One word of caution, according the Atari engineer who >> wrote Atari >> Unix, it does not work on all TT030's. Some of the units had bugs and >> issues, most came back into Atari's service center where the -33 68030's >> were replaced with slower 16mhz CPU's, so while I will guarantee that >> the >> image works, I cannot guarantee if your TT will have a problem or >> not. So >> far I've tried it out with 3 TT's and they all work. Also Atari >> Unix will >> recognize Riebl VME ethernet cards and set them as /dev/en0 so you >> can hook >> the TT up to the internet directly. I personally am going to see if >> I can >> get Apache to work on the TT as it would be great to run a website for >> Atari's on an actual Atari computer. >> >> If you want a copy, I need a 300mb SCSI HD to Ghost the image to and >> you pay >> shipping to and from me. >> >> >> Curt The sender email was no longer available so I'm writing in the mail-list - hope it is ok. I didn't know the Atari UNIX release recognize any ethernet device, but since Riebl will work I'm going to buy a TT and the network adapter. Can someone who got the image upload it and give me a information about restoring it on a hard drive( is it obligatory at any cost to be a 300MB hdd )? Regards, Plamen

18 years

PDP-8/e

by RodSmallwood＠mail.ediconsulting.co.uk

Hi Thanks for the information. However driving the scope is not the problem. I started out as a development engineer on VDU's in the early 1970's. Hence setting up the scope is not an isssue. This paticular problem is only related to the DEP and EXAM funtions. The 8e has a cycle split into parts. DEP or EXAM occur in one cycle. There's a Flipflop (RUN) on the 8330 board that is set in a time period at the beginning of the cycle by the debounced DEP key. The memory address would have been set up manually or auto incremented by a previous DEP. The switch register contents are then transferred to the data bus and the memory signalled to write into the preset address. A signal called stop the clears the RUN flipflop at the end of the cycle. So within one cycle the contents of the switch register (data) should be witten into memory when the DEP key is raised. Only it isn't Rod Smallwood -----Original Message----- From: cctech-bounces at classiccmp.org [mailto:cctech-bounces at classiccmp.org] On Behalf Of Dan Roganti Sent: 23 March 2008 18:55 To: On-Topic Posts Only Subject: Re: PDP-8/e Rod, I use both Tek scopes here, a 465 and a TDS410A. Most Tek scopes have the facility to perform a single sweep trigger to detect pulses such as that. However old your Tek scope is, there's supposed to be a button to select between 'Auto' and 'Single Swp' triggering. Also, there is a trigger source selector, this can be set for Chan.1, since your most likely to have one scope probe hooked up already. Then in the same area of the trigger panel there is an arming indicator light. This will let you know the scope is ready to detect a pulse after you set the trigger level--adjusting this to the middle should be good enough. You can also set the Horz sweep to somewhere between 100nsec and 500nsec to get a visual with the brightness turned up alittle more since it will be quick. If the pulse is detected the arming indicator will clear and the trigger indicator will blink just once. You'll have to arm the trigger again by selecting the "single sweep' button to check each signal. hope that helps, =Dan [ Pittsburgh --- http://www2.applegate.org/~ragooman/ ] Rod Smallwood wrote: > Hi > I recently aquired a complete PDP-8/e. As it had not run for a > while I took the usual precautions of reforming the electrolytics in > the PSU as well as dismantling the whole system and cleaning everything. > I was rewarded with a working system. I started to run some simple > toggle in programs and got to the stage of driving a VT 320 with a > display of whole the character set at 110baud. > > I was about to toggle in the next test which would have been a > keyboard echo routine when I discovered I could no longer load > anything into memory. > Load address works but setting the data to load into memory in the > switch register and raising DEP no longer writes the data to memory. > . > RUN works so it looks like the timing plus the RUN/STOP flipflop are > running ok. > However one shot operations like DEP and EXAM are difficult to > diagnose as is hard to see a one off 500nS pulse. > I don't think its the memory itself ( 4 x 4K of core) as I have tried > each 4K bank on its own with the same result. > I do have the CPU manual and a decent Tektronix scope. > Has anybody any suggestions? > > Rod Smallwood > > > > > >

18 years

Anyone interested in Modcomp II gear?

by wmaddox＠pacbell.net

Last summer, I collected a large amount of surplus Modcomp II gear as part of a truckload computer rescue. I am looking to find homes for some of the excess. I've placed one complete system, but it looks like I have at least one more CPU. The Modcomp II is an early 70's vintage TTL machine with an instruction set that somewhat reminiscent of the IBM 360. It has a large register file, and both register-register and register-memory instructions. The CPU is packaged in a full-sized 19-inch cabinet, rather than a smaller enclosed chassis. These machines were built for real-time control in critical applications, and were a favorite of NASA. They were very solidly built. Programming and maintenance manuals, with schematics, are available. I would be interested in finding out how much interest there is in this gear. It is located in San Jose, California. --Bill

18 years

Loading an OS onto a real PDP-11 - not an emulator

by hoelscher-kirchbrak＠freenet.de

> My final problem (Dont hold me to that though) is that I while I have a > number of disk packs, I don't believe that I have anything to boot!! > The packs are not really usefully labeled. > Having trawled the list, I can find many many messages about archiving > data off RL disk packs, and onto archival systems (such as emulators, > etc) - bit I cant find anything about how to take a disk image, and put > it onto an real RL01 attached to real PDP11 where there is no other > media... I suspect that I have to load in a serial receiver program, > and dump an image - but the details are so far, sparse.... Hi Doug, I usually transfer software to my RL packs this way: 1. I prepare a disk image with simh on my PC 2. I transfer the image file with ftp onto my PDP-11/83 (RD54 system disk) running ULTRIX-11 V3.1 (with TCP/IP!) 3. The said PDP-11/83 has got an RL controller & drive and I use both to put the image onto a RL disk pack with the help of 'dd'. This method has proven its reliability several times with different PDP-11 OSses as well as with XXDP. Unfortunately you might be missing a PDP-11 capable of running ULTRIX-11 ... Regards Ulli P.S. A MicroVAX (e.g. MV II) with an RL Controller should do as well. Copying disk images to real disks with VMS is no problem at all. I've done it very often with RD3x and RD5x disks.

18 years

Loading an OS onto a real PDP-11 - not an emulator

by doug＠stillhq.com

Hi List, Following the wonderful advice so for, My shiny PDP 11/04 has now been upgraded to a 11/34, and I have a temporary terminator pack for my RL01 disk drive. I suspect that I have a system that is capable of booting. - Wo Hoo. (read - the disks spin, and the fault light stays off.....) My final problem (Dont hold me to that though) is that I while I have a number of disk packs, I don't believe that I have anything to boot!! The packs are not really usefully labeled. Having trawled the list, I can find many many messages about archiving data off RL disk packs, and onto archival systems (such as emulators, etc) - bit I cant find anything about how to take a disk image, and put it onto an real RL01 attached to real PDP11 where there is no other media... I suspect that I have to load in a serial receiver program, and dump an image - but the details are so far, sparse.... If somebody could provide some pointers - that would be awesome..... In an ideal world, I would be able to get RSTS onto this system (I have dual RL01's - so that may not work) - Alternately, just being able to boot RT11 to load a Forth interpreter would also work. [Yes, this is where I admit to being a Forth person - I hope people will still want to talk to me having admitted that] Thanks Doug

18 years

PDP-8/e

by RodSmallwood＠mail.ediconsulting.co.uk

Hi I recently aquired a complete PDP-8/e. As it had not run for a while I took the usual precautions of reforming the electrolytics in the PSU as well as dismantling the whole system and cleaning everything. I was rewarded with a working system. I started to run some simple toggle in programs and got to the stage of driving a VT 320 with a display of whole the character set at 110baud. I was about to toggle in the next test which would have been a keyboard echo routine when I discovered I could no longer load anything into memory. Load address works but setting the data to load into memory in the switch register and raising DEP no longer writes the data to memory. . RUN works so it looks like the timing plus the RUN/STOP flipflop are running ok. However one shot operations like DEP and EXAM are difficult to diagnose as is hard to see a one off 500nS pulse. I don't think its the memory itself ( 4 x 4K of core) as I have tried each 4K bank on its own with the same result. I do have the CPU manual and a decent Tektronix scope. Has anybody any suggestions? Rod Smallwood

18 years

Loading an OS onto a real PDP-11 - not an emulator

by ajp166＠bellatlantic.net

> >Subject: Loading an OS onto a real PDP-11 - not an emulator > From: Doug Jackson <doug at stillhq.com> > Date: Sun, 23 Mar 2008 18:51:02 +1100 > To: cctalk at classiccmp.org > >Hi List, > >Following the wonderful advice so for, My shiny PDP 11/04 has now been >upgraded to a 11/34, and I have a temporary terminator pack for my RL01 >disk drive. > >I suspect that I have a system that is capable of booting. - Wo Hoo. >(read - the disks spin, and the fault light stays off.....) > >My final problem (Dont hold me to that though) is that I while I have a >number of disk packs, I don't believe that I have anything to boot!! >The packs are not really usefully labeled. > >Having trawled the list, I can find many many messages about archiving >data off RL disk packs, and onto archival systems (such as emulators, >etc) - bit I cant find anything about how to take a disk image, and put >it onto an real RL01 attached to real PDP11 where there is no other >media... I suspect that I have to load in a serial receiver program, >and dump an image - but the details are so far, sparse.... > >If somebody could provide some pointers - that would be awesome..... In >an ideal world, I would be able to get RSTS onto this system (I have >dual RL01's - so that may not work) - Alternately, just being able to >boot RT11 to load a Forth interpreter would also work. [Yes, this is >where I admit to being a Forth person - I hope people will still want to >talk to me having admitted that] Two ways I know of and they are essentailly the same. Create a pack on a working system or bring up a pack from a working sytems. Other options are a floppy based bring up (RT11 fits on floppy) or maybe loading core via serial line with a bottable image. Last option is emulateted Tu58 where the PC acts as a TU58 with RT11 and you use a serial line to boot and run fromt hat to create a RL pack. IN any case I don't think anyone has come up with a way to write a RL from a PC directly. Generally every one has at least one other media (RX01/2 or RX50 OR TK50, TUxx) for portability. It's look at the option where someone creates a pack for you or loans a pack or the emulated TU58 option. Allison >Thanks > >Doug

18 years

RK05 rack slides?

by mcguire＠neurotica.com

I have the age-old problem of a bunch of RK05 drives with only the "drive" half of the rack slides, and no "rack" half. Does anyone here have a stash of RK05 rack slides? Oh, and the other thing I'm looking for is a half-height (3U, 5.25") black blank panel, of the type that's often used on the top half of the front of a 10.5" PDP-11/34 chassis. I don't have much cash to offer (still trying to recover from a stretch of unemployment earlier this year) but I have LOTS of DEC stuff to trade. Thanks, -Dave -- Dave McGuire Port Charlotte, FL

18 years

goodies from storage: HP9810A, PDP-11/05

by mcguire＠neurotica.com

I made a trip to my (far away) storage locker today, and brought home a few things that I hope to bring back to life in the coming weeks. First is an HP9810A. I just powered it up...Several LEDs turn on immediately, but the display is blank and the keys are unresponsive. Does anyone (Tony?) have any troubleshooting hints? Are schematics for this machine floating around anywhere? The second is a PDP-11/05. It hasn't been powered up in about twenty years, and has an empty backplane. I'm pretty sure I have all the right boards, but I'll have to dig through quite a few crates to locate them. I may do that tomorrow or Friday. Friday is my birthday (39, *shudder*) and I always make it a point to do things that I love on my birthday, and hacking on a PDP-11 definitely qualifies, so I'll probably work on it then. The first thing that sticks out about the 11/05 is that the keylock switch has a key broken off in it. At least it's in the "power" position. Does anyone have a spare key for this machine? If so, can I talk you out if it? It's not one of the ubiquitous XX2247s of which I have quite a few; it's a standard "slot" key. Thanks, -Dave -- Dave McGuire Port Charlotte, FL

18 years

Matchpoint/DOB on 386/20?

by cclist＠sydex.com

> Date: Fri, 21 Mar 2008 17:13:27 -0500 > From: Jim Leonard > I used a Central Point Option Board on a 386sx-16 and a 386dx-40 so I'd > say you're safe. -- Jim Leonard (trixter at oldskool.org) How about the Matchpoint? Anyone? Cheers, Chuck

18 years

Los Angeles: Commodore PET 8032's, PDP 11/73 for trade

by drew＠asideworldwide.com

Hi - I'm looking for a PET 8032 for a photo shoot in Los Angeles. Could I possibly rent one from you? Are they for sale? Thanks! Drew (310)876-0304

18 years

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