Image Map Image Map
Page 1 of 3 123 LastLast
Results 1 to 10 of 30

Thread: Unique S-100 computer (Z-80/Vector Graphic/Micropolis)

  1. #1

    Default Unique S-100 computer (Z-80/Vector Graphic/Micropolis)

    So I'm pretty certain this is a Vector Graphic S-100 computer but I haven't seen any others like this with the built-in CRT display. I know nothing about this machine. It came with a Micropolis 1053-II disk drive. Would this computer have originally ran CP/M? I'm going to do a lot of cleaning before trying to power it on. How would I go about testing it?

    20191023_080113.jpg20191023_080118.jpg20191023_080152.jpg20191023_153223.jpg20191023_153358.jpg20191023_153918.jpg20191023_153926.jpg20191023_153934.jpg20191023_154004.jpg20191023_154101.jpg20191023_154129.jpg20191023_154144.jpg20191023_154247.jpg20191023_154255.jpg20191023_154319.jpg20191023_154340.jpg

  2. #2
    Join Date
    May 2018
    Location
    Melbourne, Australia
    Posts
    172

    Default

    Micropolis also had their own DOS called, unsurprisingly, MDOS - so that might be another possibility.

  3. #3

    Default

    Some cleaning has revealed it is a Cincinnati Milacron "George" computer, or similar.

    20191024_115025.jpg20191023_223135.jpg

  4. #4

    Default

    After checking the power supply voltages, I went ahead and booted it up. The screen is bright & clear, however all I get is a block of random characters..

    20191024_1307392.jpg

    20191024_130755.jpg

  5. #5

    Default

    The ribbon cable for the floppy drives is still there, but the Micropolis floppy controller is missing. This system could run CP/M or MDOS. The version of VG PROM monitor will also help know what it ran. What exactly is shown in the two EPROM labels?

    The system has 56K or RAM (48K + 8K) so most likely it is a version 4.x monitor. The Micropolis controller would have been strapped at F800h See https://deramp.com/downloads/vector_...ler/ReadMe.pdf for a bit more info.

    Mike

  6. #6

    Default

    That’s actually a very good first power-up! The CRT, CRT driver, and video boards look like they’re probably all good. They are typically more difficult to troubleshoot than CPU and memory. The VG PROMs only need the 1K RAM on the PROM/RAM board in order to run, so I’d focus on the PROM/RAM board and CPU board first.

    Mike

  7. #7

    Default

    Quote Originally Posted by deramp5113 View Post
    The ribbon cable for the floppy drives is still there, but the Micropolis floppy controller is missing. This system could run CP/M or MDOS. The version of VG PROM monitor will also help know what it ran. What exactly is shown in the two EPROM labels?

    The system has 56K or RAM (48K + 8K) so most likely it is a version 4.x monitor. The Micropolis controller would have been strapped at F800h See https://deramp.com/downloads/vector_...ler/ReadMe.pdf for a bit more info.

    Mike
    You're right - there was no Micropolis controller in there - the ribbon cable was just hanging inside the case.

    The 12K PROM/RAM board has 2 chips installed. "VG MON VERS 4.0" - one marked "#0 E000" and the other marked "#1 E400".

    I agree, I was glad I at least got something when I powered it on. So how would I go about testing this board? Even when I left only the Flashwriter in there, I got the same garbled screen. How would you suggest troubleshooting?
    Last edited by nullvalue; October 24th, 2019 at 06:14 PM.

  8. #8
    Join Date
    Jan 2010
    Location
    Central VA
    Posts
    4,706

    Default

    The Vector 3 was a similar system, from Vector Graphic of course. If it's a Cincinnati Milacron product, that'd certainly explain the industrial-ish design: they made NC and CNC machine tools.

  9. #9

    Default

    The display you’re seeing is from the uninitialized video RAM on the Flashwriter. The fact you’re seeing that display means the Flashwriter is probably OK and the CRT driver and CRT are good. The code in the monitor PROM that would initialize the display RAM is not being executed upon power on/reset. This could be due the CPU board or the PROM/RAM board. Do you have another S-100 system you can put the PROM/RAM board in and test it (e.g., see if you can dump the PROMs, access the 1K RAM)?

    Mike

  10. #10

    Default

    Quote Originally Posted by deramp5113 View Post
    Do you have another S-100 system you can put the PROM/RAM board in and test it
    I do not, this is my first S-100 system of any kind. I'll try to get some hi-res shots of the boards up here.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •