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Type: Posts; User: bladamson

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  1. Wow, that right-angle PCB jobbie looks a lot...

    Wow, that right-angle PCB jobbie looks a lot better than I was expecting!

    Nice job.
  2. I have some ISA proto cards whose brackets have a...

    I have some ISA proto cards whose brackets have a break-out section (kinda like you see on electrical junction boxes) that's set up so you can break it out for different sizes of d-sub connector. ...
  3. What qualifies as "not low volume"? Could...

    What qualifies as "not low volume"? Could several of us do a group buy?
  4. It could be used for any sort of geek port, but I...

    It could be used for any sort of geek port, but I plan to plug it into the GPIO header of a raspberry pi. I want to eventually try to write a DOS packet driver bridged to the pi's ethernet, and I...
  5. So I've spent part of the morning trying to...

    So I've spent part of the morning trying to figure out the most efficient way to handle the bus driver(s)' /enable decoding for my multifunction card. My first thought was to use a single '245 and a...
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    Howdy from Appalachia.

    I've been here for a bit, but I just realized I never posted an introduction!

    Howdy! My name is Lee, from Fort Seybert, West Virginia (population ~50). I used to be a software engineer and Unix...
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    Anyone recommend any kicad tutorials?

    Anyone recommend any particular kicad tutorials, oriented towards the CAD newbie? This latest project is too complicated to hand-wire, and I'm too dumb to know which tutorials are decent and which...
  8. This, for sure. You've got to take advantage of...

    This, for sure. You've got to take advantage of the bulk pricing break points. If you spend ~$300 now to stock up on all the basic logic gates, discretes (10k resistor packs and pullups, and bypass...
  9. Yeah, I guess you really don't lose any board...

    Yeah, I guess you really don't lose any board space with your riser, do you? I was coming at it from the angle of "gotta cram in as much as I can in a limited footprint", heh.

    Now if we could...
  10. I am trying to dream up a way to design my...

    I am trying to dream up a way to design my eventual printed board such that it has an ISA edge connector (for standard PC/XT systems), but also has a spot where an optional PLUS header can be...
  11. Adlib, on a 90 degree ISA riser.

    Adlib, on a 90 degree ISA riser.
  12. Positive pressure on the inside of the enclosure....

    Positive pressure on the inside of the enclosure.

    Keeps the magic blue smoke in the chips. :3
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    Aha, very good. Thank you. Apparently I need...

    Aha, very good. Thank you.

    Apparently I need to learn to read. XD
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    I wonder why it's part of the ROM area. I was...

    I wonder why it's part of the ROM area. I was under the impression that populating the ROM area was optional. But if RP2 is left out, and that connection really means D7 on the IDE connector rather...
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    Oh jeez yeah, I forgot all about the SSL...

    Oh jeez yeah, I forgot all about the SSL certificate. Thanks for the reminder! I meant to check up on that today. =:3

    I've had a Let's Encrypt certificate on order through Dreamhost, but it...
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    On the rev 4 schematic... ...

    On the rev 4 schematic... http://minuszerodegrees.net/xtide/rev_4/XT-IDE%20Rev%204%20-%20schematic%20diagram%20-%20at%2015MAR2018.pdf

    Down about area D-1 way down at the bottom left of the...
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    Acceptable signature content?

    So I've been kinda working on setting up a blog and a youtube channel for my old computer projects.

    Would it be too gauche if I put links to them in my forum signature? I haven't found any...
  18. I have one of those Tandy 1000/1000A RAM/DMA...

    I have one of those Tandy 1000/1000A RAM/DMA cards. I don't remember the specifics off the top of my head, but IIRC it just has a couple of simple PALs on it. Nothing that could have flipflops or...
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    Closet-Fresh Software...

    I was digging around in my old room at my dad’s old house, and found a few neat things…

    https://www.oldcomputerfun.com/wp-content/uploads/2019/11/IMG_20191031_220053-1024x768.jpg

    Macintosh LC...
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    No 386es though? :< Will the 286 boards drop...

    No 386es though? :< Will the 286 boards drop into the Model 25-XT without having to modify anything? What's the clock speed on that 286?
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    Just had the thing open again to install the RAM....

    Just had the thing open again to install the RAM. Working great!



    Here ya go.
    https://i.imgur.com/GtTD3YW.jpg



    Here they are, if this helps you identify them:
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    Yeah, I have read articles about converting...

    Yeah, I have read articles about converting regular 30-pin 9-chip parity simms to work in the PS/2s that require them. You have to cut a couple traces and run some jumper wires.

    As for whether...
  23. Exactly! :D :D :D Not to mention the...

    Exactly! :D :D :D

    Not to mention the possibility of emulating other old systems. If one were running a CGA->VGA converter (I assume it would work with TGA too....), along with an HDMI->VGA on a...
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    Sorta, but I *think* the Model 25 16-bit riser...

    Sorta, but I *think* the Model 25 16-bit riser uses a single card-edge without a bite out of it, where it plugs into the system board. And it's shorter than all those, and only has slots on one...
  25. 4 pins must be +5v, ground, and +/- 12v (for the...

    4 pins must be +5v, ground, and +/- 12v (for the serial part).

    I find it strange that they'd waste a slot instead of making it into some kind of external device with its own power supply.
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