May 2025 - cctalk - classiccmp.org

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.

2 months

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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

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

2 months, 1 week

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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

2 months, 1 week

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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.

2 months, 1 week

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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

2 months, 1 week

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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.

2 months, 1 week

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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

2 months, 1 week

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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

2 months, 1 week

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Compute's Gazette returning

by wrcooke＠wrcooke.net

I saw on the BASIC Programming group on FaceBook that a new venture is going to start publishing Compute's Gazette again. https://www.computesgazette.com/ Perhaps interesting to some of you. Will You just can't beat the person who never gives up. Babe Ruth

2 months, 1 week

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