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101090 discussions

Looking for TRS-80 Model III boot floppy

by alanp＠snowmoose.com

A friend of mine not on the list has a TRS-80 Model III and is looking for a boot floppy for it. 5-1/4" drive. Can anyone help me out here? alan

19 years, 6 months

Flexowriter 2300 maintenance info somewhere ?

by jos.mar＠bluewin.ch

Once again common sense lost out am I am now the "proud" possessor of a rather run-down Friden-Singer Flexowriter model 2300. Anyone know of online resources for these beasts ? Google / Bitsavers did not yield results. Jos Dreesen

19 years, 6 months

2 dec printers free for shipping

by chrism3667＠yahoo.com

LA210-A2 and LA75 companion printer. Unknown operating condition, yellow and exposed to some dampness. LN03 laser, HEAVY Emulex tape drive, ext. SCSI box - ping ____________________________________________________________________________________ Want to start your own business? Learn how on Yahoo! Small Business. http://smallbusiness.yahoo.com/r-index

19 years, 6 months

Northstar Horizon

by ajp166＠bellatlantic.net

> >Subject: Re: Northstar Horizon > From: "Dave Dunfield" <dave06a at dunfield.com> > Date: Sun, 26 Nov 2006 09:44:57 -0500 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > > >> FYI the e800h start address works for SD or DD as the SD rom appears twice >> in the address space at both e800h and e900h. > >Not always - I have several different revs of SD controller cards, and I know that >on at least one of them the E900 rom does NOT mirror at E800 - however I also >have several cards that do mirror (which is nice because you don't have to change >the CPU jumpers to swap SD/DD controllers). I have three revs of the SD controller and all hit on both addresses. Maybe a forth rev? Allison

19 years, 6 months

Northstar Horizon

by Watzman＠neo.rr.com

The real problem is that it uses HARD-SECTOR 5.25" diskettes, which are just about impossible to find. Yes, you can use a PC compatible 5.25" 360k drive, if it's jumpered properly.

19 years, 6 months

Northstar Horizon

by ajp166＠bellatlantic.net

> >Subject: Re: Northstar Horizon > From: "Chuck Guzis" <cclist at sydex.com> > Date: Sat, 25 Nov 2006 08:32:35 -0800 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >On 25 Nov 2006 at 3:27, jim stephens wrote: > >> And my memory of 256 bytes may be off, I vaguly recall maybe on 32 bytes >> are visible and used by the processor at boot. People had to use pretty small proms >> in the early days of the hobby. > >I recall that the disk controller had a small bipolar prom and that >it was indeed 32 bytes. It was miles better than toggling the boot >code by hand... A 256-byte boot prom back then would have been an >almost obscene luxury... ;) No, it was 256bytes for SD and 512bytes for DD. FYI the e800h start address works for SD or DD as the SD rom appears twice in the address space at both e800h and e900h. Allison

19 years, 6 months

Northstar Horizon

by ajp166＠bellatlantic.net

> >Subject: Re: Northstar Horizon > From: "Dave Dunfield" <dave06a at dunfield.com> > Date: Sat, 25 Nov 2006 13:29:16 -0500 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >> On 25 Nov 2006 at 3:27, jim stephens wrote: >> >> > And my memory of 256 bytes may be off, I vaguly recall maybe on 32 bytes >> > are visible and used by the processor at boot. People had to use pretty small proms >> > in the early days of the hobby. >> >> I recall that the disk controller had a small bipolar prom and that >> it was indeed 32 bytes. It was miles better than toggling the boot >> code by hand... A 256-byte boot prom back then would have been an >> almost obscene luxury... ;) > >Well - then I guess NorthStar was obscene... :-) > >The single-density controller does indeed have 256 byte of ROM (in three chips!) >The double-density one has 512 bytes of ROM. the boot rom was two 256x 4 parts (bipolar) and the third was the address decode for the board (also 256x4 bipolar). > >The controller occupies 1K of memory space from E800-EBFF > E800-EFFF ROM on DD, unused or mirror ROM on SD > E900-E9FF ROM on both SD and DD > EA00-EAFF Hardware control (address is write value) > EB00-EBFF Write data (address is data) > >I might have EA00 & EB00 reversed, it's been a while since I was in the >nuts and bolts of the N* controller. Without checking the manuals thats about right. Allison

19 years, 6 months

Various problems

by ethan.dicks＠gmail.com

On 11/26/06, John Robertson <jrr at flippers.com> wrote: > I have similar trouble in my day job which is restoring early arcade > games from the 1960's and 70s.... What a fun job. I'll bet you see some nice items pass by. > Oddly enough the old logic boards seem to keep working, have a few > games from the very early 70's (Computer Space and Pong that are > quite serviceable. so much for the old time theory that cosmic rays > led to TTL failures as these boards would all be dead if that was the > case. I think the cosmic ray theory went away when there was an issue with some 4K Intel DRAMs that turned out to be alpha particles from something radioactive in the clay for the ceramic package, _not_ particles from outer space. The story lived on, though. I've looked at the schematics for Computer Space - looks like it could still be built, if you could stand the rather simplistic gameplay. I've thought about a modern implementation, but it's a "ship in a bottle" project - I'd probably build it, then put it aside fairly quickly -ethan

19 years, 6 months

"Teletype magnetic tape unit"?

by legalize＠xmission.com

What the heck is this thing, anyone know? <http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320053338394&ssPageName=…> -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://www.xmission.com/~legalize/book/download/index.html> Legalize Adulthood! <http://blogs.xmission.com/legalize/>

19 years, 6 months

A request...

by alhartman＠yahoo.com

Not in the least... Mark Twain was making a joke about educated people mis-spelling words accidentally. He wasn't speaking about people making up words and purposely using them to annoy others in an attempt to be "cool". Al > From: Chris M <chrism3667 at yahoo.com> > > --- Al Hartman <alhartman at yahoo.com> wrote: > > >> > Right! >> > >> > Besides, Mark Twain was once heard to remark: >> > >> > "It takes an uncreative man to spell a word only one >> > way!" >> > > My point all along ;)

19 years, 6 months

SMS LE interface

by aek＠bitsavers.org

> One of the boards (SMS le interface) looks like an interface to a > disk controller. SMS made a dual disk system that had a 8" floppy > and an 8" hard disk in a 3RU cabinet. The system has a controller > in it that connected to the host via a 40 pin ribbon cable. > I think the "le interface" is the host end of that connection... I still > have one of the disk cabinets and controller. (somewhere) Documentation for the winchester/floppy subsystem would be a nice thing to find. SMS made several different subsystems in the 80's with that interface which weren't always compatible with DEC controllers. I have some documentation on the FW series under sms on bitsavers 3000632D_FW_OEM_Feb82.pdf

19 years, 6 months

Northstar Horizon

by river＠zip.com.au

Hi, I've recently acquired an old Northstar Horizon S-100 system. It has 3 cards; the ZPB-A2 processor card, MDS-A3 disk controller card and the RAM-32-A1 card. It has no diskette drives. The MDS-A3 card has a blown tantalum capacitor (C6) and the motherboard has a blown tantalum capacitor (C1). The motherboard is a HRZ-MB-4. I'm going to clean it up and replace the blown caps and run some checks on the power supply. I also have downloaded the relevant documentation to check the processor and disk controller cards, and also the HRZ-MB documentation. Assuming all goes well I need to get my hands on some disk images to run on this system. Does anyone know where I can get such images? Also, can I use old IBM PC full-height 360K disk drives in this machine? regards river

19 years, 6 months

Dilog DQ-20 & DQ-130 docs? (More Mystery Qbus boards)

by oldcpu＠rogerwilco.org

Charles wrote: > > www.rogerwilco.org/mystery_boards/#Dilog_DQ130 > > http://www.dilog.com/unibus.html > > DQ130 Qbus, Pertec I/O, TM11, 4 drives, Quad Height Ah, yes, I'd forgotten that link which I came across a couple of months ago. Sadly, no doc online. I guess I could try out their support team and see how friendly they are with requests for informatoin on 25-year old gear. ;) J

19 years, 6 months

Northstar Horizon

by ajp166＠bellatlantic.net

> >Subject: Re: Northstar Horizon > From: "Chuck Guzis" <cclist at sydex.com> > Date: Sat, 25 Nov 2006 10:02:05 -0800 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >On 25 Nov 2006 at 13:29, Dave Dunfield wrote: > >> Well - then I guess NorthStar was obscene... :-) > >My comment was directed toward your reference to the Tarbell >controller, not the NS. > >> The single-density controller does indeed have 256 byte of ROM (in three chips!) >> The double-density one has 512 bytes of ROM. > >A question crops up: why? What's the point--you need only enough to >load a sngle sector. Was the NS controller so badly implemented >that it required that much code to read a single sector? I would not say badly implemented, more like dirt simple. NS* took the software can replace hardware path. For example the code in the rom sets the drive select, does the step direction and timing and walks through the find the right sector, wait for sync flag and start reading process. Allison

19 years, 6 months

Northstar Horizon

by ajp166＠bellatlantic.net

> >Subject: Re: Northstar Horizon > From: "Barry Watzman" <Watzman at neo.rr.com> > Date: Sat, 25 Nov 2006 14:56:01 -0500 > To: <cctech at classiccmp.org> > >The real problem is that it uses HARD-SECTOR 5.25" diskettes, which are just >about impossible to find. > >Yes, you can use a PC compatible 5.25" 360k drive, if it's jumpered >properly. Correct! I'm using FD55BV (half height 48tpi two side) and they work fine for either SD or DD. The official drive for SD version was SA400 (35 track) and for DD SA400L or TM100 as by then both were the standard. Allison

19 years, 6 months

need a plotter... in or near nj not wa :(

by chrism3667＠yahoo.com

offlist if you please :) ____________________________________________________________________________________ Cheap talk? Check out Yahoo! Messenger's low PC-to-Phone call rates. http://voice.yahoo.com

19 years, 6 months

FREE pen plotter (and other goodies) in Kent, WA

by kyrrin＠bluefeathertech.com

Fellow Techies, I've said it on my web site, and I'll say it here: Scrounging is not so much ongoing acquisition as it is a 'flow-thru' of goodies. Any tech-scrounger will eventually hit the point where they Just Need To Move Stuff Out. Such is the case with me right now, so I'd like to take a moment here to feed back to the same 'techie food chain' that I've benefited from for so many moons. Specifically: I've got the following FREEBIES available for PICKUP ONLY, NO SHIPPING in Kent, Washington. The only condition I place on the stuff is that whoever takes it needs to be taking it to USE IT, not to sell it for scrap. --HP DraftMaster SX Plus large-format pen plotter, in excellent condition. Includes a whole slew of pens (condition unknown, but they've been kept capped in an indoor environment) and two packages of big paper (including a pack of Size D sheets). This item is not that heavy, and it is on wheels, but it is bulky and tall. You will need at least a small pickup truck with an open bed to move it properly. --Compaq ProLiant 6500 server with twin Pentium Pro 200's. This was the box that was originally running my FTP archive (I've since upgraded to a later model of ProLiant). Working condition, 512MB RAM, and I think I could find a pair of rack slides and maybe even enough 4 gig drives to make a small array if you twist my arm enough. --A pair of Sun SPARC-10 systems with at least 50MHz HyperSPARC CPU modules installed. These used to run part of my Internet presence before I upgraded to HP NetServers, so I know they work. RAM and hard drives included (though I will need to wipe the drives before they're taken as they still contain security-sensitive data). If you'd like any or all of the goodies (hopefully all in one swell foop?), just drop me a line. Keep in mind that I don't currently subscribe to the CCTech or CCTalk lists, so you'll need to let me know via direct E-mail. If, for whatever reason, your E-mail bounces you can give me a buzz on 253-639-2996. Thanks in advance for helping me find this stuff a good home. -=-=-=-=-=-=-=-=-=-=-=- Bruce Lane, Owner & Head Hardware Heavy, Blue Feather Technologies -- http://www.bluefeathertech.com kyrrin (at) bluefeathertech do/t c=o=m "If Salvador Dali had owned a computer, would it have been equipped with surreal ports?"

19 years, 6 months

Northstar Horizon

by Watzman＠neo.rr.com

Re: "But you will have a bit of a "chicken and egg" problem - the NorthStar disks are hard-sectored, which means that you can only make them on a system with the NorthStar controller. Unless you have other N* systems kicking around you will have to use the Horizon. But the Horizon has no front panel, or other means to easily bootstrap code into it other than the disk drive." Install the North Star disk controller card into a CP/M system configured such that there are no memory or I/O port conflicts. Then you can assemble source code of the NorthStar DOS using CP/M's ASM, and load it into RAM using DDT. There are routines in the NorthStar ROM (which will now exist in the CP/M system) for formatting a disk and writing out RAM to the diskette. It's possible for a NorthStar controller and a typical CP/M soft sector controller to co-exist in the same system at the same time, if you resolve any I/O port and memory conflicts. This allows the use of CP/M and all of it's facilities (in particular, source code editors, ASM and DDT) to create a first NorthStar diskette. ------------------------------ Message: 8 Date: Sat, 25 Nov 2006 06:56:50 -0500 From: "Dave Dunfield" <dave06a at dunfield.com> Subject: Re: Northstar Horizon To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Message-ID: <200611251101.kAPB1t0K026282 at hosting.monisys.ca> > It has no diskette drives. The MDS-A3 card has a blown tantalum capacitor > (C6) and the motherboard has a blown tantalum capacitor (C1). The > motherboard is a HRZ-MB-4. Make sure you have the disk controller designation right - My single density NorthStar controllers are called MDC-An and the double density ones are called MDS-AD(n). You need to figure out if you have a single density or double density controller in order to determine which boot disk you need. If it's MDS, I think it should be double-density, but I expected the latter part to be "-AD3". I have photos of both controller types on my site the difference between a single-density and a double-density is easy to see . > I'm going to clean it up and replace the blown caps and run some checks on > the power supply. I also have downloaded the relevant documentation to check > the processor and disk controller cards, and also the HRZ-MB documentation. I have a lot of NorthStar material and documentation on my site - much of it in the Altair section (One of my Altairs has a NorthStar controller). > Assuming all goes well I need to get my hands on some disk images to run on > this system. Does anyone know where I can get such images? Also, can I use > old IBM PC full-height 360K disk drives in this machine? I have many images for both single and double density Horizon systems on my site - if It's SD, your choices are NorthStar DOS and my own DMF system. If DD, the choices are NorthStar DOS, CP/M and UCSD Pascal. But you will have a bit of a "chicken and egg" problem - the NorthStar disks are hard-sectored, which means that you can only make them on a system with the NorthStar controller. Unless you have other N* systems kicking around you will have to use the Horizon. But the Horizon has no front panel, or other means to easily bootstrap code into it other than the disk drive. If you happen to have an S-100 ROM card, you could use it to bootstrap the Horizon. I've got a very simple monitor that you can use to bootstrap in the NorthStar tools archive. Also - in case you are not aware, the 10 sector diskette are physically different than a typical soft-sector diskette (11 sector holes instead of one) - you need 10-sector diskettes for the Horizon which can be difficult to find. Dave -- dave06a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Collector of vintage computing equipment: http://www.classiccmp.org/dunfield/index.html ******************

19 years, 6 months

Model 19 teletype on ebay

by legalize＠xmission.com

<http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110060375575&ssPageName=…> -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://www.xmission.com/~legalize/book/download/index.html> Legalize Adulthood! <http://blogs.xmission.com/legalize/>

19 years, 6 months

Northstar Horizon

by billdeg＠degnanco.com

River, I happen to have a Northstar on the table now, and I am in the process of making backups of the system disks now that I have it up and running. Here is a picture: http://www.vintagecomputer.net/northstar/horizon/northstar_horizon_card_view. jpg Contact me off list for a boot disk. http://www.retrotechnology.com/herbs_stuff/d_nstar.html ..is a good place to start for documentation and manuals. Bill D > >Hi, > >I've recently acquired an old Northstar Horizon S-100 system. > <snip> >Assuming all goes well I need to get my hands on some disk images to run on >this system. Does anyone know where I can get such images? Also, can I use >old IBM PC full-height 360K disk drives in this machine? > >regards >river

19 years, 6 months

Special HD20 INIT file

by SUPRDAVE＠aol.com

In a message dated 11/25/2006 4:20:48 A.M. Eastern Standard Time, teoz at neo.rr.com writes: Apple apparently made a special INIT file for the HD20 (non SCSI HD that connected to the back of a Mac 128K or 512K using the 19 pin floppy port) so that unsupported machines (like an SE/30) could read the drive and copy the files from it (but not write to it). Anybody here happen to have a copy of this special INIT file? Somebody has some data they need off the drive (he is in Japan) and only has an SE/30 to use. Anything pre Nubus is out of my experience level so I figured somebody here might have the file needed ------------------------------ IIRC, Apple tech support mentioned that the SE/30 was not supported. However, I plugged my HD20 into a IIci and it worked just fine.

19 years, 6 months

DSSI Trilink connector in Renton

by compoobah＠valleyimplants.com

Any interest in one of these? It's a DEC DSSI trilink connector- HD68 to 2x (microribbon? nanoribbon? not sure) 50, as used on the best HSD arrays- etc. etc. etc. In Renton, WA near Seattle.

19 years, 6 months

Dilog DQ-20 & DQ-130 docs? (More Mystery Qbus boards)

by oldcpu＠rogerwilco.org

I've got a couple of additional boards that I've rustled up, and can't seem to locate any information on them. Can anyone point me to a source? I've also posted images of these two boards on my Mystery Qbus Boards page: www.rogerwilco.org/mystery_boards/#Dilog_DQ20 www.rogerwilco.org/mystery_boards/#Dilog_DQ130 A big thanks to all that have responded to my request for more information on my handful of 'Mystery Boards'. Thanks, Charles, I now have enough information on the Clearpoint Q-RAM 44B (I thought it was 11B) 2MB memory board to make use of it (still not sure what the 'F' jumpers are for...) J

19 years, 6 months

wtd - pc tech journals

by chrism3667＠yahoo.com

I also have Jan and Feb of 85 --- cctalk-bounces at classiccmp.org <chrism3667 at yahoo.com> wrote: > 86 and prior. I have some from 86-87, so trades are > also of interest. And if anyone (even Pat ;) should > need an issue or article, cram it! LOL LOL only kidding > > > > ____________________________________________________________________________________ > Do you Yahoo!? > Everyone is raving about the all-new Yahoo! Mail beta. > http://new.mail.yahoo.com ____________________________________________________________________________________ Want to start your own business? Learn how on Yahoo! Small Business. http://smallbusiness.yahoo.com/r-index

19 years, 6 months

by technobug＠comcast.net

An article on Yahoo News <http://news.yahoo.com/s/ap/20061123/ ap_on_hi_te/digital_copyright> dealing with recent copyright exemptions granted by the US Library of Congress had an item of interest for classiccmp listers buried down at the bottom: "He granted two exemptions dealing with computer obsolescence. For computer software and video games that require machines no longer available, copy-protection controls may be circumvented for archival purposes. Locks on computer programs also may be broken if they require dongles ? small computer attachments ? that are damaged and can't be replaced." CRC

19 years, 6 months

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