test-drb

test-drb@ccmp.vtda.org

101090 discussions

by chrism3667＠yahoo.com

I know I've seen ads for these in the past. Can anyone inform as to those models that were available here or in the great white north (er Canada).

15 years, 10 months

Commodore C 900 documentation and software required ...

by bernd＠kopriva.de

Hi, a short time ago, i got hold of a C 900 (bare machine only, no keyboard/monitor), that i want to get working again ... I have already searched the Web for specs of keyboard and monitor but without success. The machine has an AT-type keyboard plug, but it's not clear (at least for me), if a normal IBM compatible keyboard will work. As i have the workstation version, the display resolution should be 1024*800 which seems to be a bit uncommon, so i'm not sure, which monitor could work ... Can anyone provide some documentation, that would help to find a working keyboard/monitor ? Getting the software for the machine would be very helpful too ! ... Thanks a lot Bernd

15 years, 10 months

IBM S/370 retrieved

by mcguire＠neurotica.com

I've just taken possession of a small IBM System/370 mainframe, and I thought I'd share the joy. This system has been sitting in North Carolina waiting for me for about six months; I've only now been able to arrange for transport due to financial restrictions. I've got 450 pictures and nearly a gigabyte of video to sort through, but here's a quick series of shots, including one or two with yours truly striking a pose: http://www.neurotica.com/misc/s370/ The system is a member of the 9370 family. It consists of a 9375 processor, five 9335-B01 disk drives (824MB/ea), two 9335-A01 controllers, and a 3430 tape drive. Everything was shrink-wrapped and sealed with IBM anti-tamper stickers. All the cabling is present; it's all coiled up in the back of the processor cabinet. I also received a mountain of documentation which I've not yet gone through. Everything is absolutely pristine save for some tape residue. I broke the seals and unwrapped the system personally, with camera rolling and heart pounding. Thanks to my friend George Adkins for the Herculean effort of loading it onto a truck in North Carolina and bringing it down here, and my friends James Sharp and Pat Sherrill for assisting with the unload. If I can get it running, I'd like to run VM/370 and/or MVS on it. It originally ran VSE/SP. On that note...does anyone have an appropriate console terminal for this system that might be available? I believe that'd be a 3215, or perhaps an early (C.U.T. protocol I think) 3270. I am so happy about this I can hardly contain myself. =) -Dave -- Dave McGuire Port Charlotte, FL

15 years, 10 months

OS/8 editors, was Re: Programing PDP-8 assembler - details

by djg＠pdp8online.com

> I'm very much interested in both of those. Can I talk you into making >them available? > I have a copy of vista here http://www.pdp8online.com/pdp8cgi/os8_html?act=dir;fn=images/os8/dewar-edit… In a search I found this http://vandermark.ch/pdp8/local/Sources/read_dir.php?f=Other/new-22-vista-2… It appears to be the vista editor source. The actual vista source seems to be in the empty at the end if its complete. I haven't tried to build it. Has modules for a couple different terminals.

15 years, 10 months

Making Amiga Disks

by alhartman＠yahoo.com

Just to let all the folks on the list know... There's a program just like the Disk Transfer Utility for Apple ]['s called "Amiga Explorer". It's sold by Cloanto, who makes "Amiga Forever". Being an owner of that, I have the program. All I need to do is find one of my Null Modem Cables to attach a PC to the Amiga 500 to transfer disk images. It will even install the program needed on the Amiga end over the serial connection. So, once I get the Amiga 500 sorted out (the unit came badly packaged, showed up in pieces and isn't working...), I'll be able to transfer OS disk images to it. Anyone have advice on which version of Kickstart ROMS and OS is the best/most useful on an A500? Is there a driver to use a ZIP Drive as mass storage? Or use an old Adaptec Parallel Port SCSI adapter to run a Disk Drive? Al

15 years, 10 months

Dynalogic Hyperion MS-DOS disks

by bear＠typewritten.org

I'm helping a local school district with a technology exhibit. They have a Dynalogic Hyperion, and are looking for the custom MS-DOS for it. Anyone who might be able to help is encouraged to contact me off-list. Thanks! ok bear

15 years, 10 months

OC/OD 48 ma transceivers

by cclist＠sydex.com

I'm working on a controller to drive some long >1m bidirectional lines that require 220/330 termination and 48 ma. drive current capability. For sake of argument, call them SCSI-1 SE (but they're not SCSI (or HPIB)). I'm finding that my choices are pretty limited. I could use a 74F621, 74FCT621 (CMOS) or a good old 75160. All appear to be within the same approximate price range. Can anyone make any recommendations? Thanks, Chuck

15 years, 10 months

Authentic PDP-11 rack available for rescue in London

by jonathan.pdp11＠gmail.com

Dear All I have a PDP-11 rack available for rescue in central London. It's just the metal rack, no computer or power supply. Sadly space is no longer available for it. It's the cream-coloured style, about 42-inches tall, with a radiused top, to match your 11/34 and RL02s. Has both sides, top, and two front blanking panels. Has a few rust spots but not too bad. Castors. It looks like this 11/94 <http://www.pdp11.co.uk/profiles/item-enlarge.ehtml?i=38>. It would really suit someone trying to achieve an authentic "cream period" PDP-11 which I believe began with the 11/04 in 1976. I might be able to find one or two more pieces, I think even an old power supply for a 11/34. Free for anyone who would like to collect it. Would require a van or at least an estate car. Any takers? Kind regards, Jonathan.

15 years, 10 months

pinout for Vector Graphic's ZCB cable

by dm561＠torfree.net

It's just a straightforward 16-pin DIP to DB25 IDC ribbon cable, DIP pin 16 aligned with DB25 pin 1. Boy, those are huge files, almost 70MB; my copy from Howard Harte's site is only 3MB (there are several revisions BTW). mike ******************************************* Date: Wed, 16 Jun 2010 08:35:50 -0400 From: "Bill Degnan" <billdeg at degnanco.com> Subject: re: pinout for Vector Graphic's ZCB cable > > I have a Vector Graphic's ZCB cable that is wired for a 9600b 8/n/1 serial > terminal. It was working yesterday, but the connections were brittle and a > few of the wires have come loose from the 25-pin connector. I can see the > spots where the solder was applied but I am not confident that I have the > correct repair points. Does anyone have the pinouts for this cable so I > can re-solder/replace? <snip> I believe this is the answer to my question page 10 of http://vector-graphic.info/vg_zcb.aspx (download/part 2) Bill

15 years, 10 months

quick test: floppy motor speed variation

by keithvz＠verizon.net

Since I've been failing miserably coming up with a working verilog PLL, I decided to do something easier tonight. I captured about 1,000 index pulses from a Sony MPF920-E(if I read date code right, it's from April 1997) with a 20+ year old floppy disk with a logic analyzer. I exported the data, and then massaged the data into some results with Excel. My average pulse was 200.487ms apart. All pulses were within 55us of each other, range was 200.464ms -> 200.519. Standard deviation was 9.46us. This sounds way way better than the NatSemi AN-505 note of 1-2%. Is anyone else surprised by this result? I was expecting differences measured in milliseconds not micros. Thanks Keith

15 years, 10 months

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