January 2024 - cctalk - classiccmp.org

imd2raw.c correction - linearizing ImageDisk images

by David Schmidt

There have been a few versions of the utility imd2raw.c floating around that will take Dave Dunfield's ImageDisk-created images (i.e. an .IMD file) and make a linear binary image devoid of any metadata. This is similar to the function of Dave's IMDU.COM program's /b switch. I've corrected a problem with the assumption that all imd2raw.c descendants to date have made: sectors that have a skew (i.e. not 1-1 interleaved) weren't linearized correctly. The skewed sectors need to be written out in "sorted" order, which is not necessarily captured/physical order. This is easily verified by comparing output from "IMDU /b" to earlier imd2raw outputs on any .IMD that has a sector skew that isn't 1, 2, 3 [...]. It's up on github here: https://github.com/RetroFloppy/imd2raw

2 days, 19 hours

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NRAO Data tapes

by Dani Werts

Hello, I'm an employee with the National radio astronomy observatory here in Socorro New Mexico. As part of our NGVLA upgrades, we are seeking to get rid of old data tapes from the tape reel days of Computing. These contain things such as the boot loaders, OS, specific collection programs and antenna movement programs. I personally would hate to see these just wind up in the literal dumpster and would like to see them sent out to a museum or an archiving body that can preserve them and keep them safe as a dynamic part of history. If anyone is interested or knows someone who would be interested in the VLAs data tape library please let me know. V/R Danielle Werts Front end engineer VLA Socorro New Mexico

5 months

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WTB: PSU for DEC PDP8F

by robinson＠tuberadio.com

Hi there, I need a power supply for my PDP8F computer. It is missing. The PDP8F 19" chassis box came in 3 different depths, 600 mm (PSU front to back) 370 mm (PSU across the back) 300 mm (PSU front to back) I need the shallow one, the 300 mm PSU front to back. Do you have one available, or know where I can get one please. Even if it is dead! regards ray

2 years, 3 months

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VCF SoCal

by Sellam Abraham

I'll be attending VCF SoCal on February 17-18 in Orange (California) in the capacity of a presenter (on a panel and a solo presentation). Is anyone else planning to attend the event? Sellam

2 years, 4 months

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FTGH: (3) Qualstar 1260 9 track tape drives pertec interface

by js＠cimmeri.com

2 units working when properly stored a few years ago. 1 unit, parts unit. Must take all 3. Tested successfully only with a PC and a VAX. Located in Frederick, Maryland, USA

2 years, 5 months

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Re: Vmebus

by Wouter de Waal

> >Anyone have a VMEbus system they use at least occasionally? If so, what >make/model/config? I still use a couple of PPC VME boards (DY4 / Curtiss Wright 182/183/184, both Conduction-Cooled and Air-Cooled) to test the tail end of hardware that we are still shipping (by now EOL and basically NOS). But it's work, I don't find them interesting. If someone here has the warm fuzzies for PPC VME, we can talk :-) W

2 years, 5 months

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vt220 firmware source?

by Fritz Mueller

Hi folks, I’m working on a vt220 debug/repair and have gotten to the point where I need to trace firmware execution at boot. I’ve managed to dump the proms (close to but slightly different from the versions in Lars’ GitHub) and the 8051 internal rom, and can load and disassemble these with the s51 simulator. I also have an HP 1660 logic analyzer successfully configured and clipped up to capture instruction traces. I’m about to dive in to commenting the disassembly listings, but figured I’d ping here to see if anybody might have done this already in case I wouldn’t have to start from scratch? thanks much, —FritzM.

2 years, 5 months

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Re: VCF SoCal

by Wouter de Waal

>I have found that computers are much like motorcycles: many of the >most interesting were never available in the US. Computers are much like motorcycles: many of the most interesting ones were TERRIBLE! W

2 years, 5 months

10
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Vmebus

by Bill Degnan

Anyone have a VMEbus system they use at least occasionally? If so, what make/model/config? Bill

2 years, 5 months

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NEC APC external floppy drivers needed

by Just Kant

I don't even have an APC anymore. But since this thing is eyeing me menacingly I figured I'd put the request out. Butler Flats Associates dual external 5 1/4" accoutrement, has it's own controller card (based on wd1771/1772 iirc). Contact me off list if you have these. Much appreciated. Sent with [Proton Mail](https://proton.me/) secure email.

2 years, 5 months

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cctalk January 2024