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Type: Posts; User: blackepyon

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  1. It works with the original DMA/RAM expansion...

    It works with the original DMA/RAM expansion board, and with the 3-chip solution we worked out.
  2. Na, the 8237A was for my board later. I've got a...

    Na, the 8237A was for my board later. I've got a few other projects I want to finish up first before I can get back to that (including TTL a monitor with a bad vertical circuit that I need to fix and...
  3. There aren't any left in my area :cry: I miss...

    There aren't any left in my area :cry: I miss Radio Shack. Nothing but cellphone and gadget shops these days.
    I order almost everything I need from Digi-Key now. Just keep a cart open and keep...
  4. Not likely the library symbol itself, but all the...

    Not likely the library symbol itself, but all the PLCC chip and socket footprints are in the default libraries. One thing that I liked about Altium CircuitMaker was the cloud library (don't like that...
  5. They do make through-hole sockets for PLCCs,...

    They do make through-hole sockets for PLCCs, thankfully, so there's no need to worry about DIP adapters or surface-mount soldering. Digi-Key PN ED90008-ND

    The total card clearance for the second...
  6. It was just luck that the guy brought the HP...

    It was just luck that the guy brought the HP 16500 into the club around the time I was thinking of buying one off Amazon. He already had another one at home. Probably end-of-service surplus from his...
  7. I happen to have an old UART chip kicking around....

    I happen to have an old UART chip kicking around. That was a future project I had in mind, but wanted to finish the current stuff first. But I can pretty much guarantee that there'll be a demand for...
  8. Well, that means whatever is going on, it's on my...

    Well, that means whatever is going on, it's on my end. I'm gonna yank all the chips and test them in the programmer just to make sure it's not something stupidly simple.
  9. You can do basic logic probing with an...

    You can do basic logic probing with an oscilloscope as well, even an analogue one. And unlike with a logic analyzer, you can use an oscilloscope to measure voltages too!
  10. A bad PCB in the batch? That's rare. My logic...

    A bad PCB in the batch? That's rare.

    My logic analyzer is an HP 16500 mainframe with a 16510 card installed. Picked it up at my local retro-computer meetup where one guy was trying to thin out his...
  11. Well, I reversed my dual bodge, and did it as you...

    Well, I reversed my dual bodge, and did it as you did, but still locks up after detecting 640K. Either I've got a bad chip, or the LS and HCT aren't playing nice.
  12. The '00 and '08 are LS, the '245 and '138 are...

    The '00 and '08 are LS, the '245 and '138 are HCT. The speeds are around 10 and 12ns, I think? The main difference between them is how much current and voltage they can receive and drive, but that...
  13. Well, at least you're faring better than I am. I...

    Well, at least you're faring better than I am. I wonder if I might have a bad socket and one of the wipes isn't making proper contact? I can't get your board to work. It detects 640K, and...
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    Apparently they did actually make sound cards for...

    Apparently they did actually make sound cards for it. But as you say, they were quite rare, and expensive. A parallel port OPL3 dangley thingie might be a good half-way point.

    Non sound MCA cards...
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    Sweet! Thanks! That's going onto my next...

    Sweet! Thanks!
    That's going onto my next Digi-Key order.
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    Story of all our lives, I'm afraid. My Tandy...

    Story of all our lives, I'm afraid. My Tandy 1000HX and 1000RSX, I held on to for nostalgia reasons, but I had a sizable collection over a decade ago (IBM 5150 and several other PC/XT clones, Mac...
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    I wouldn't mind getting a PS/2... IF I can find...

    I wouldn't mind getting a PS/2... IF I can find one at a fair price. Like the TRS-80, it's got a nice aesthetic, but they also tend to be pricey, like around the $400-500 CDN mark on eBay.
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    I haven't tested it with the resistor removed, so...

    I haven't tested it with the resistor removed, so I can't say if it's for the charging circuit or not. I only desoldered it to try and get a read off it, then I put it back in.

    My benchtop PSU...
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    I'm in no rush. It's working for the moment, I'm...

    I'm in no rush. It's working for the moment, I'm just making a list of parts for my next Digi-Key order. I also need to find an appropriate power brick for it. Mine never came with one, and I'm just...
  20. The HX with a CF solution installed is actually a...

    The HX with a CF solution installed is actually a pretty nice compact setup for the old DOS games that supported Tandy video/sound.



    If you're thinking of getting an RSX for the Tandy Sound,...
  21. Oh, I see that LGR just did a video on this...

    Oh, I see that LGR just did a video on this motherboard!
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    Yeah, the PS/2 line was IBM's attempt to wrest...

    Yeah, the PS/2 line was IBM's attempt to wrest back control of the market after everybody copied them. Didn't work too well, probably due to the same reason as the PC-Jr: ridiculous price tag, and...
  23. More or less. "Modern" floppies (PC standard)...

    More or less. "Modern" floppies (PC standard) need a couple pins swapped to make it work (I think it's pin 10 & 12 for A:, I need to check my notes) besides lifting the power pins. If you've got a...
  24. I'm curious as to where he's getting all these...

    I'm curious as to where he's getting all these Tridents, because he's got them for 8-bit VGA cards as well.
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    Yeah, so long as they've been parked before...

    Yeah, so long as they've been parked before moving, a little lube in the stepper motor and they last near side of forever. Or so I hear, I haven't had any on hand to play with for years.

    Its not...
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