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Type: Posts; User: Eudimorphodon

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  1. Replies
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    I just couldn't help but find it ironic that the...

    I just couldn't help but find it ironic that the keyswitches and keycaps that happened with were the most expensive thing I've ordered from Aliexpress, by about a factor of two at least.
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    I've done a few orders from AliExpress, and out...

    I've done a few orders from AliExpress, and out of, I dunno, 20 items, I only had one complete no-show, and one other case that I don't know if I should feel sorry/guilty over, both of which I did...
  3. But in the same vein, it seems a perfectly...

    But in the same vein, it seems a perfectly reasonable assumption on the part of an expansion card designer to assume that if you’re plugged into a computer that’s turned on and the address bus...
  4. I guess what I was envisioning wasn't actually a...

    I guess what I was envisioning wasn't actually a flux transition device, more along the lines of a conventional "higher level" floppy emulator. So strictly speaking it'd only have to store the actual...
  5. The reason I worry it could actually be...

    The reason I worry it could actually be significant is when I was hacking around with my “ROM override” scheme I discovered, well, this (I explained it, sort of, in the linked thread):

    All the...
  6. What about the case of a 74LS245 buffer that's...

    What about the case of a 74LS245 buffer that's activated by the same chip select line as the peripheral(s) it's buffering? For instance, how the 245 is activated on the Low Tech memory board:
    ...
  7. I was thinking specifically of a device that...

    I was thinking specifically of a device that could work in the Northstar 10 sector Double Density controller, and the rough line of thinking was along the lines of:

    1: My memory isn't certain on...
  8. I've been wondering about the possibilities for...

    I've been wondering about the possibilities for this myself, although it's a significantly more involved project than I've pulled off up to this point. The germ I've been pondering is if this could...
  9. Ideas for a "switchable" 8-bit ISA Riser.

    Recently I did some hacking on my Tandy 1000 HX test mule to figure out strategies for freeing up the parts of the memory map occupied by the mostly useless onboard DOS and Deskmate resources so they...
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    The PCjr technical manual says it does indeed...

    The PCjr technical manual says it does indeed have a conventional character generator ROM in a socket it explicitly says is compatible with 2716 or 2732 EPROMS. See page 2-49.
  11. I went to the store yesterday and they were...

    I went to the store yesterday and they were completely sold out of both isopropyl and... distilled water. (I'd heard of the isopropyl shortage but, distilled water, really?) Did try a little vinegar...
  12. To expand on what durgadas311 said, yes, there...

    To expand on what durgadas311 said, yes, there were some fairly early "PC Clones" like the Tandy 1000 or AT&T 6300 that diverged significantly from the "IBM standard" (although strictly speaking the...
  13. The motherboard is completely pulled out until I...

    The motherboard is completely pulled out until I can find something effective at getting that flux residue off, so that’s not a problem. The connection lugs were in good shape and it unplugged...
  14. Okay. So, I’ll take inventory of what I have to...

    Okay. So, I’ll take inventory of what I have to work with and what I need to buy to do it with using an external supply instead of the transformer outputs. The power supply wiring is in very good...
  15. ... Also, re: my earlier speculation that this...

    ... Also, re: my earlier speculation that this was built from a kit instead of pre-manufactured, in addition to all that flux residue on the motherboard it may be significant that the S-100 slots are...
  16. Some pictures from yesterday. Here's an extreme...

    Some pictures from yesterday. Here's an extreme closeup of that nasty gunk I found all over the solder side of the motherboard. I assume it's ancient flux residue:

    62569

    There's also some on...
  17. I've been looking for an excuse to get a decent...

    I've been looking for an excuse to get a decent bench power supply, so maybe I can use this as the occasion to pull the trigger; I'd probably get a lot more use out of that than an AC variac.

    So,...
  18. Okay. Just so I’m 100% clear, the resistors...

    Okay.

    Just so I’m 100% clear, the resistors should go between the leads from the transformer and the capacitors? Just on the hot side, leave the grounds wired up as normal? That should be easy...
  19. I put about three hours of elbow grease into the...

    I put about three hours of elbow grease into the N* today; took quite a few pictures but I’m too done at the moment to curate and scale them. Some brief updates:

    1: All the s100 cards look pretty...
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    I wonder if one of the facts that's mixed up in...

    I wonder if one of the facts that's mixed up in there and badly misremembered is DRI's work on the "IBM 4680 OS", which was a variation of FlexOS, itself an evolution of Concurrent DOS 286, which was...
  21. The data sheet I looked at estimated three weeks,...

    The data sheet I looked at estimated three weeks, I believe?, but I didn’t want to be too melodramatic.

    (Although the estimate in said sheet may have defined “erased” as “starts to lose data”, not...
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    Glad it worked for you. I mean, sure, I get why...

    Glad it worked for you. I mean, sure, I get why people would rather not use them because they steal a little bit of conventional memory (although I believe with EZ-Drive there's a driver you can load...
  23. Heh. If you want a project I'm sure you could...

    Heh. If you want a project I'm sure you could flip them with a bit (or a lot) of elbow grease. But the "smell terrible" detail is definitely a little off-putting.
  24. That's good to keep in mind if I settle on...

    That's good to keep in mind if I settle on something I want to burn in "forever", certainly. For this situation, though, I'm thinking it's very likely that I might want to re-flash this chip a few...
  25. Yeah, that's why I'd rather use it than a...

    Yeah, that's why I'd rather use it than a UV-erase 2716.
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