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  1. Thread: Won a Poly 8813

    by falter
    Replies
    8
    Views
    126

    Yeah I noticed that after - I wondered why it had...

    Yeah I noticed that after - I wondered why it had the ribbon cable going to the rear. I have on occasion seen the proper controller come up on ebay but not very often. I'll bet the disk drives are...
  2. Thread: Won a Poly 8813

    by falter
    Replies
    8
    Views
    126

    Won a Poly 8813

    Wow.. I did not expect to win this one:
    ...
  3. Replies
    63
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    4,331

    Can't wait to see progress reports and pictures! ...

    Can't wait to see progress reports and pictures! I was looking forward to building one on the original design but being gifted an original sort of killed the motivation for that. Still trying to...
  4. Replies
    19
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    1,227

    Well I mean just literally having.. not that it...

    Well I mean just literally having.. not that it works. :)

    I have some confidence though as I was able to resuscitate the 400k on my Lisa.
  5. Replies
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    1,227

    Okay I don't know if this is really an NOS 400k...

    Okay I don't know if this is really an NOS 400k drive, or just the unit removed when a replacement was ordered. I note the drove sticker says Sep 1984 and the box says 1986. But I'm taking a chance...
  6. Thanks Larry. Ok so I think this is coming...

    Thanks Larry.

    Ok so I think this is coming down to the attributes controller. It's a pity the only places that have them want a minimum order of $200. There are quite a few Hyperions out there...
  7. I decided to put this on the bench and get it...

    I decided to put this on the bench and get it apart to check things. The first thing I wanted to do was make sure the Character generator ROM was good. I desoldered it and did a dump. Here is what...
  8. Thread: Nascom

    by falter
    Replies
    223
    Views
    15,711

    Ah.. I found the mistake... I didn't put a space...

    Ah.. I found the mistake... I didn't put a space in between the quotes in line 50. Doh. Now it works - although the snow effect is so bad as it does it I get nervous because I think the thing is...
  9. Thread: Nascom

    by falter
    Replies
    223
    Views
    15,711

    One other thing I don't remember BASIC doing that...

    One other thing I don't remember BASIC doing that it does now.. if I do a list... it'll do the first five lines or so and then stop, and then I have to hit enter to see more? Is that normal behavior?
  10. Thread: Nascom

    by falter
    Replies
    223
    Views
    15,711

    So far so good. I tried to do a little 'test'...

    So far so good. I tried to do a little 'test' program I have in my head... didn't quite work as imagined. Basically I do something like this:

    10 CLS
    20 FOR A=1 TO 30
    30 CLS
    40 FOR I=1 to A...
  11. Thread: Nascom

    by falter
    Replies
    223
    Views
    15,711

    Interesting. I decided to try swapping out the...

    Interesting.

    I decided to try swapping out the 74S04 in IC9 with another. I didn't have another S04 but I did have a brand new 7404. So I put that in IC10 and moved the S04 in IC10 to IC9. Now...
  12. Thread: Nascom

    by falter
    Replies
    223
    Views
    15,711

    Made a quick check in between family stuff......

    Made a quick check in between family stuff... there is no cap installed for IC9. It is a 74s04. There is also a 74s04 next to it in ic10.
  13. Thread: Nascom

    by falter
    Replies
    223
    Views
    15,711

    Yes I've been a bit negligent with this office PC...

    Yes I've been a bit negligent with this office PC but now we seem to be on a happier path.

    Anyway, I got the scanner installed, here's both sides of the board:
    ...
  14. Thread: Nascom

    by falter
    Replies
    223
    Views
    15,711

    Thanks Dave. I have been dealing with a meltdown...

    Thanks Dave. I have been dealing with a meltdown in my main PC so I haven't been able to do much except replace the 7402... just to see if it made any difference (nope). Even before I changed it...
  15. Thread: Nascom

    by falter
    Replies
    223
    Views
    15,711

    Strange... yeah this is over my head -- don't...

    Strange... yeah this is over my head -- don't really understand why there's a 7402 involved but I see one of its legs is plugged into where the memory adddress ports are.
    ...
  16. Replies
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    355

    Well, I'm using them for actual vintage computer...

    Well, I'm using them for actual vintage computer projects -- like for example, I have all the parts for a digital group 8080 system here but lack an authentic keyboard to go with. Modern just...
  17. Replies
    22
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    355

    I wish I could find somewhere to get replacement...

    I wish I could find somewhere to get replacement keycaps for my SWTPC CT82. Is it super expensive getting them made? The SWTPC has kind of a dark grey color to them I've not been able to find...
  18. Replies
    6
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    174

    Win 10 Circle of doom

    Gah. I shut down my PC - no problem... started back up... boom, blue screen of death. Restarted... now all I get is a black screen with an alternating pointer/blue circle. Hard drive runs...
  19. Replies
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    This is the only thing I could find about the...

    This is the only thing I could find about the Scientific Devices keyboard:

    http://retro.hansotten.nl/kim-1-rev-b-ceramic-cpu-ascii-display-ascii-keyboard-brutech-4k-ram/

    Only other references...
  20. Replies
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    355

    I ended up buying these two: ...

    I ended up buying these two:

    https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F223439007393
    ...
  21. Replies
    22
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    355

    Are these parallel ASCII?

    These Microswitch units always seem to grab big bucks.
    ...
  22. Thread: Nascom

    by falter
    Replies
    223
    Views
    15,711

    I'll try to check that when I finish work... sort...

    I'll try to check that when I finish work... sort of think I can figure out how.

    I was looking around for a schematic for this card but no luck. One thing I will note, don't know if it's...
  23. Thread: Nascom

    by falter
    Replies
    223
    Views
    15,711

    Basically what happens when it goes sideways is...

    Basically what happens when it goes sideways is you can only use and modify 0000-0FFF. All other RAM is locked down. The contents of everything from 1000 to FFFF all show up as 7E and you cannot...
  24. Replies
    6
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    263

    My guess would be some rando CPM thing or maybe a...

    My guess would be some rando CPM thing or maybe a word processor. Very cool looking. But for a few more points of resolution you could read the tag... blast you pre-4k world!
  25. Thread: Nascom

    by falter
    Replies
    223
    Views
    15,711

    RAM has all been tested in the working A2+ and...

    RAM has all been tested in the working A2+ and all comes up just fine.

    So what seems to be happening is the Nascom is somehow 'losing' much of its available RAM. I have 32K of 4116s installed on...
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