May 2025 - cctalk - classiccmp.org

by Peter Ekstrom

I am putting together a PDP-11/23 and have a working RSX-11M 4.4 OS running in simh while I wait for a few parts. I want DECnet as well. I have the 4.7 kit and have done a netgen, but I can't install it because I don't have the CEXPAR partition in my system image. I have gone over the VMR command in the manual a few times and tried various things to try and create the partition in my image, but have not been successful. I assume (from looking in the manuals) that I either need to create that partition in my image, or make room for it? The netgen process has the defaults of 113500 as the base and 4300 as the size. VMR complains about 'non-existing memory' for the base and if I try the wild card I get 'alignment error'. I have 512KW of memory that I plan to use in the real machine, so simh is configured with that as well. Any pointers would be greatly appreciated. -Peter

1 year, 1 month

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Uploading PDFs to Bitsavers

by Christian Liendo

I'm sorry if this has been asked before. How can I send PDFs to Bitsavers? I know I cannot just FTP and create a directory. I am looking on the website but I am probably not reading what is right in front of me. Any help would be appreciated.

1 year, 1 month

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Wang TTL BASIC

by Steve Lewis

Is anyone out there familiar with the Wang 2200 BASIC? Of about 1973/1974 C. Corti, I think you still have one of these complete and runnable? My question is, was its basically really "built" using TTL logic/chips? The system didn't really have a microprocessor (neither did the early Alto, right?) I recall that system had many boards, the whole "CPU" box was external to the monitor (and in the earliest versions, the power supply was also a large external box). I can't really fathom creating a BASIC out of raw TTL, or maybe I'm misunderstanding the approach. -Steve

1 year, 2 months

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Wang TTL BASIC

by Bob Yates

Schematics for your viewing pleasure. More detailed information can be found in other parts of the website. https://www.wang2200.org/schematics.html

1 year, 2 months

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PDP-11 hardware clock

by Peter Ekstrom

Hello PDP-11 Gurus, I am looking for a better time-keeping alternative than the LTC in my PDP-11/23-PLUS. Is the KWV11-C card the best option for that or are there other options? I have looked around a bit and have seen some other RTC boards but don't know if they would work. -Peter

1 year, 2 months

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Re: Looking for an IF-20 interface for an Brother AX-45 typewriter

by Stefaan Ponnet

I'm attempting to interface with the 15-pin connector on the AX-45. I'm assuming it uses a similar protocol as the IF-50 / IF-30 interface which has been described in other forums https://forum.classic-computing.de/forum/index.php?thread/29023-panasonic-r… and has a working interface emulation https://www.youtube.com/watch?v=1UJ5cyvNC_M I opened up the typewriter and traced the pins of the 15-pin centronics connector. So far I came up with this pin 1 : GND pin 2 : connected to the IC + has a pulldown resistor pin 3 : GND pin 4 : connected to the IC + has a pulldown resistor pin 5 : GND pin 6 : connected to the IC + has a pulldown resistor pin 7 : GND pin 8 : N/C pin 9 : N/C pin 10 : connected, but haven't been able to trace yet pin 11 : connected, but haven't been able to trace yet pin 12 : connected, but haven't been able to trace yet pin 13: N/C pin 14: N/C pin 15: N/C Probably these pins map to DATA CS CLK and ACK But this is still a work in progress - If we can figure out how to get the typewriter to listen to our commands we're one step closer to getting it to print.

1 year, 2 months

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Re: Wang TTL BASIC

by cclist＠sydex.com

The Packard-Bell PB440 (1963) was microprogrammable: https://bitsavers.org/pdf/packardBell/PB-440/SP-149A_PB-440_microprogrammin… Various earlier systems used microprogram-like techniques, but I don't know how many were earlier than PB in their use of the word. Was the PB-250's floating point microprogrammed? --Chuck

1 year, 2 months

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Mac SE disk cleaning

by Brian Knittel

Passing on a request: anyone know of a way to erase user data off a Mac SE hard disk that will leave the disk and Mac OS intact? The machine works and could go to a new home but has privileged medical data on it so just deleting files isn’t sufficient — the free space has to be overwritten. Are there any utilities available on floppy disk that could do it? Plan B is taking a sledgehammer to the drive, but seems a waste to go right to euthanasia if there’s another option.

1 year, 2 months

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QRAM-2 SAB-1 manual?

by Peter Ekstrom

So I have one of these boards, but I haven't been able to locate a manual for this specific one. Does anyone have the manual for this specific board? - Peter

1 year, 2 months

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kennett classic surplus sale open, NeXT cube for sale, more.

by Bill Degnan

https://www.kennettclassic.com/surplus/ Lots of items remain. Priced cheap for pick-up only Also have a complete NeXT cube with display, mouse, keyboard. SCSI2SD card harddrive installed. Works $2700. Will consider shipping this. Contact me privately with questions. Bill

1 year, 2 months

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