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  1. 1

    Printer ribbon type?

    Thanks Tofro, Google found an advert in Digital Design (June 1981) for Two-Day Corp printer mechanism, the matching one is the GPM-80-A (or B), with 80 columns, 8" platen and 60 lpm. Now need to find some other printers that used this mechanism to help find some ribbons. Regards, John
  2. 1

    Printer ribbon type?

    Hello, I'm looking for a new printer ribbon for a 1980 dot matrix printer (Nascom IMP). Attached are some photos, was this compatible with any other printer please? I doubt Nascom designed s custom ribbon. Note on the base is a slotted axle for winding the ribbon. Thanks, John
  3. 1

    Rainbow CP/M user manual?

    Apologies, I see there are two versions of this manual on archive.org, this has the missing pages: https://archive.org/details/Rainbow_100_CP-M_86-80_Users_Guide/ Regards, John
  4. 1

    Rainbow CP/M user manual?

    Thanks to all the people who scanned in this and the many other Rainbow manuals. I spotted a gap in the CP/M manual, it jumps from page 123 to 140 so if anyone has an original a scan of these would be fantastic. Regards, John
  5. 1

    Rainbow CP/M user manual?

    Thanks! Don't know why I couldn't find it, I guess I searched for DEC Rainbow, not Rainbow 100. Regards, John
  6. 1

    Rainbow CP/M user manual?

    Hi, Has anyone got a scan of such a manual please? I've found the CP/M technical manual on archive.org which has some useful info on ports and disk formats, but I'm looking for more basic info. One question I have (yet to try out) is how to adjust serial baud rate. I assume if I change it in the...
  7. 1

    Installing and running Kermit under CP/M on a Northstar Advantage

    Update: Kermit archive for CP/M-80 is now here: http://www.columbia.edu/kermit/archive.html
  8. 1

    Formatting non-RX50 diskettes in an RX50 drive

    Hi, Thanks desaster for the info. He is probably too modest to mention it, but he has made a couple of very useful Youtube videos on bringing up his Rainbow 100A: Unfortunately the http://www.softsector.aplaholm.se/computers/ is down (for me?), so has anyone else got a copy of RFMAT.ZIP, I...
  9. 1

    Two Q1s found in London

    Thanks Mattis, Glad you got to the bottom of this. The Q1 Lite is still an interesting machine, but not a 'Pre-Altair Microcomputer' so apologies for posting in this section of the forum. So looks like there is only one known Q1 (1972) machine left? Is it on shown somewhere? Regards, John
  10. 1

    Two Q1s found in London

    Ok, please let the interestingengineering.com people know, and also Kingston university who are showing it at an exhibition: https://www.kingston.ac.uk/news/article-amp/2920/13-feb-2024-worlds-first-microcomputer-goes-on-display-alongside-range-of-other-vintage-computers-in-public-exhibition/...
  11. 1

    Two Q1s found in London

    Anyone come across the Q1? This article: https://interestingengineering.com/innovation/worlds-first-desktop-computers-unearthed-in-london-house-clearance claims the Q1 microcomputer was launched in 1972 (using the Intel 8008), so about the same same as the Datapoint 2200 came out with the...
  12. 1

    Review and evaluation of some vintage educational computer systems

    Thanks for making these videos, it's always interesting to see working examples of historical machines I would otherwise never come across. Regards, John
  13. 1

    Who knows something about the old NEC PC-6001A around here?

    Thanks, the NEC C2373 looks like a package with two diodes back to back. Normally one of the output voltages is fed back to a control circuit on the primary side. Regards, John
  14. 1

    Who knows something about the old NEC PC-6001A around here?

    Hi, I don't know details about the 6001 but can comment about PSUs in general. Were you measuring the supply outputs with any dummy loads attached? Often you need to draw the rated current from the +5V output (which is normally regulated) which then causes the +12V / -12V outputs (unregulated)...
  15. 1

    NEC PC-8031 floppy power supply notes (part of PC-8001 computer)

    Hello, A rather later follow-up on PC-8000 series power supplies, this time for my PC-8012BE (I/O unit with 230V PSU). This uses a slightly different PSU, a CYG290/41 by Shingenden. This has a power plug with +5V, +12V, -12V outputs to the PCB (so no -5V hence the difference). Again supply was...
  16. 1

    NEC PC-8001 memory size - 32K or 16K

    I expect NEC were aware of CP/M 3 which supported banked RAM on the Z80, but never developed / released it for the PC-8001. NEC supported paged RAM on the PC-8801MkII and later machines. Other 8-bit PC makers added paged RAM in a variety of ways, eg Acorn supported sideways RAM, HP added an...
  17. 1

    NEC PC-8001 memory size - 32K or 16K

    Either please. I was wondering if maybe there were revisions of the motherboard with different RAM sockets, or if 16K machines just had 8 empty DIL sockets. Regards, John
  18. 1

    NEC PC-8001 memory size - 32K or 16K

    Hello, According to wikipedia the PC-8001 came with either 16K or 32K of RAM. I've only seen the 32K version (picture of my motherboard attached with 16 RAM chips each 16Kx1 bit on the left). If anyone has a 16K machine please confirm wherever their motherboard is the same or has only 8 RAM...
  19. 1

    Searching for NEC PC-8001A software & hardware

    Many thanks Carl, these are essential reading for any PC-8001 owner (who can't read the Japanese manuals). Has any one managed to run the disk version of N-Basic? This needs a boot disk (single sided for PC-8032). Regards, John
  20. 1

    Searching for NEC PC-8001A software & hardware

    Hi, Here are some books with type-in programs for the PC-8001. Books are in Japanese but all listings are in English: https://archive.org/details/pc-8001_202312 https://archive.org/details/pc-8001-basic Following has a tutorial section with step-by-step small type-in programs...
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