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  1. The modem board has few components that violate...

    The modem board has few components that violate that; there's a metal isolation transformer that goes as far as the pin 2 row near the connector itself, and there's a big fat... filter? on the other...
  2. It's unlikely the line drivers on a standard...

    It's unlikely the line drivers on a standard serial card will work right without those voltage feeds, though, and RS-232 is bipolar, so a "1" is actually represented by a negative voltage. So if you...
  3. Heh. Yeah, that's all of five minute's work...

    Heh. Yeah, that's all of five minute's work there. ;) Figured a card for these old dinosaurs deserved appropriate branding.

    Anyway, yeah, no problem you've been busy. I was a little worried I was...
  4. For what little's it's worth I've been banging my...

    For what little's it's worth I've been banging my head on laying out a serial port card for a Tandy EX, and the schematic I'm adapting (one by Sergey) does indeed imply that (...^D^D) the RS-232...
  5. That's a really good point. EX manual says the...

    That's a really good point.

    EX manual says the minimum load on the 12v line is .1 amp. The fan is 12v, perhaps that's enough.
  6. I hope the EX's PSU doesn't also melt its 12v...

    I hope the EX's PSU doesn't also melt its 12v without a load. I may regret installing that internal Gotek.
  7. Layout finished for a CF-only daughtercard. (The...

    Layout finished for a CF-only daughtercard. (The "easy" part.)

    55371

    I'm really glad I double-checked everything before I got too deep into laying the traces; I discovered that one of the two...
  8. Doh! It *is* interesting to find out that a...

    Doh!

    It *is* interesting to find out that a Tandy 1000 is entirely 12v logic. I guess it makes sense given the vintage of the machine.
  9. I have no intelligent suggestions, I just want to...

    I have no intelligent suggestions, I just want to say I approve of that big black rocker switch you hacked into the Gotek case. I don't care what it does, I want one in my Gotek.

    Okay, well,...
  10. This is another shot in the dark, but... I've...

    This is another shot in the dark, but... I've been banging on KiCad today, and I noticed while cleaning up traces on a potential Rev 2 of the board that the MEMR trace takes a *really* torturous path...
  11. ... although, I definitely want to make clear...

    ... although, I definitely want to make clear that if you're sick of it and want to take a break to work on your stuff that's awesome, don't feel obligated to bang your head on this wall. I really...
  12. So that almost certainly has nothing to do with...

    So that almost certainly has nothing to do with it... I do have two stupid ideas.

    1: if you have the board fully occupied with ICs... Does it make any difference if you sever the connection...
  13. I was thinking about this a little today, and...

    I was thinking about this a little today, and just to sanity check: your HX still works with other RAM expansions, right?

    A theory that brewed in my head is I was wondering if it's possible there...
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    Yeah, that's what I was was suspecting. A Jr-IDE...

    Yeah, that's what I was was suspecting. A Jr-IDE should be roughly the equivalent to SRAM in a Tandy for expansion RAM speed, and would be another data point for "your machine will be faster with no...
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    Also, re: how comparable the Tandy 1000's video...

    Also, re: how comparable the Tandy 1000's video ASIC is to the PCjr's, I think these scores:



    Compared to these:

    [UID7F5C71D]
    MemoryTest=5926
    OpcodeTest=3584
    VidramTest=3373
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    Paging through my copy of the DATABASE.INI for...

    Paging through my copy of the DATABASE.INI for Topbench it doesn't look like there are results for an original 1000/1000A in there, the closest thing there is is a 1000 SX in slow mode. And comparing...
  17. ... forgot this earlier, but this probably would...

    ... forgot this earlier, but this probably would be an interesting experiment to try, with the one correction that the external memory you want to see if it detects should be in the 8-9000h segments....
  18. FWIW, congratulations on the purchase, I hope the...

    FWIW, congratulations on the purchase, I hope the machine is working fine. Purely coincidentally I randomly happened to see the Craigslist ad I'm guessing you bought it from yesterday, and it was...
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    Does your T1000 have a RAM card installed or is...

    Does your T1000 have a RAM card installed or is this part of a demo meant to run on an un-expanded machine? RAM access to the shared planar RAM probably is slower than a PC; faster than a PCjr but...
  20. So, this is a common misconception about what...

    So, this is a common misconception about what that extra 128kb in a TX or TL does. It does *not* reside in the A or B segments. (Annoyingly I cannot find online a technical manual for the TL, but I'm...
  21. In a previous thread you mentioned you have one...

    In a previous thread you mentioned you have one of those Lo-Tech RAM boards that lets you map RAM in 64k chunks? I'm curious if you've tried using it to fill the 80000 - 9FFFF space with an extra...
  22. So I did just find a datasheet (of sorts, it's...

    So I did just find a datasheet (of sorts, it's pretty minimal) for Light Blue; it's in the PDF of the 1000 HX manual that's floating around the web.

    Honestly about the only strategy I can think of...
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    It might be interesting for you to run Topbench...

    It might be interesting for you to run Topbench with your card set for backfill and the original card (assuming you have one lying around) in your 1000/A and see if there's also a measurable...
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    Does your EMS card replace the normal base memory...

    Does your EMS card replace the normal base memory card you'd have in a 1000, or is it an add-on (and therefore you're still running with a DMA chip present)?

    This morning I pulled out my old...
  25. I laid it out earlier, but, yeah, the issue is I...

    I laid it out earlier, but, yeah, the issue is I can't feed an alternative frequency into light blue for just the CPU, it's completely different from the timing chip in the SL. A single 28 mhz clock...
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