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Type: Posts; User: nztdm

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  1. Are JP3 and JP4 closed when using 74F00, and open...

    Are JP3 and JP4 closed when using 74F00, and open when using SPLD?
    I can't think of anything else at present.
  2. Are you sure the SPLD is programmed with the...

    Are you sure the SPLD is programmed with the correct configuration? The speaker still works with the SPLD?
  3. I did reply to your message. I recommend...

    I did reply to your message. I recommend contacting me via email instead. VCF has message limits for new users.
  4. Hello 1. I haven't, no. Perhaps at a later...

    Hello

    1. I haven't, no. Perhaps at a later date via a 16C552 or FDC37C665GT.
    2. As above.
    3. Yup ED is supported too. This is based on Sergey's Floppy/Serial card, using the PC8477 floppy...
  5. They are certainly in limited supply, along with...

    They are certainly in limited supply, along with FE2010A. I keep seeing the tridents pop up on various places. I made a custom test jig for them with a QFP-160 ZIF socket.
  6. Looks like it just went down for an hour earlier...

    Looks like it just went down for an hour earlier today. Should be fine now.
  7. I've written a small NuXT user manual. Some of...

    I've written a small NuXT user manual. Some of the info is redundant as it's on the PCB too, but it's clearer in the manual.
    ...
  8. USE!UMBS.SYS allows UMBs on XTs. DOSMAX allows...

    USE!UMBS.SYS allows UMBs on XTs.
    DOSMAX allows loading DOS5.0 and up into UMB.
    With that config you end up with 10K conventional memory used after booting up DOS6.22, with more free upper memory...
  9. The Rev1.2 seems to be bug-free. I've built a...

    The Rev1.2 seems to be bug-free. I've built a whole bunch and all work without issue with the serial port

    Changes:
    Rev1.2:

    replace memory decoder SPLD with discrete logic, since I have board...
  10. I can't remember what I did exactly to read my...

    I can't remember what I did exactly to read my Compaq ROMs, but it did require something a lil extra.

    I believe I lifted a pin or two from the programmer and connected to GND or VCC.

    I know I...
  11. Replies
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    983

    Yup! Most are based off of open source creations....

    Yup! Most are based off of open source creations.
    My modified designs are on the Github, linked on product pages, as well as my original designs.
  12. Ahh that was you! You seem like a nice chap...

    Ahh that was you!
    You seem like a nice chap yourself! :D




    Yup! It's based on Sergey's. Just smaller.
    More info and links are on my site. eBay doesn't like links.

    Cheers
  13. Try moving the serial card closer to the...

    Try moving the serial card closer to the Micro8088. Does that help?
  14. The DeluxeFloppy card that was mentioned...

    The DeluxeFloppy card that was mentioned previously is what you're after if you'd like support for any PC floppy drive.
    I may be able to supply a floppy cable if I have spares. I seem to have an...
  15. That is normal, and related to not using DRAM....

    That is normal, and related to not using DRAM. You can ignore it :)
  16. I am also looking for more, as my two vendors are...

    I am also looking for more, as my two vendors are dried up; I don't have many.
    PM me if you'd like to buy one.
  17. This one has the 16550 connected to the bus...

    This one has the 16550 connected to the bus directly. (The bus itself is goes through a 245 from the CPU, but that's to separate AD bus and D bus, and maybe for driving it if the CPU/chipset is too...
  18. Was there a noisy bus? I couldn't tell. But...

    Was there a noisy bus? I couldn't tell.

    But moving the serial circuitry close to the bus rather than on the far end of the board, fixed it.
    I decided to try this after I was able to reproduce the...
  19. The NuXT Rev1.1 is ready. Uploaded to GitHub. ...

    The NuXT Rev1.1 is ready. Uploaded to GitHub.

    I have built and tested one, with as many cards and software as I can, and I can't get the serial port to drop out. It passes the CheckIt Serial Port...
  20. Thread: 10 message limit

    by nztdm
    Replies
    10
    Views
    2,065

    I have 72 posts and I have the 400 message limit....

    I have 72 posts and I have the 400 message limit.
    When I was a new user, I had the 10 message limit. Can't remember when it was lifted.
  21. Replies
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    3,123

    That's awesome! I have been wanting to get CMS on...

    That's awesome! I have been wanting to get CMS on my CT1336A SB.
    I have some GALs and a programmer, and can get the SA1099 chips.
    What software do you use to compile the equations you've provided...
  22. Replies
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    851

    Can't you upgrade the BIOS with the official DOS...

    Can't you upgrade the BIOS with the official DOS AWDFLASH utility and ROM image that Gigabyte still provides on their website?

    I'm assuming you mean GA-686LX, not GA-868LX.
  23. Nope I tried that. And they may have to be on...

    Nope I tried that.
    And they may have to be on the other side of the PCB by the serial circuitry.

    The spikes also seem to be in a working 5150 so I can't tell if they're bad or not.
    I'm having an...
  24. I've made the adapter PCB, that doesn't block the...

    I've made the adapter PCB, that doesn't block the first ISA slot. Can be purchased from my store in signature, or made yourself. Source files here:...
  25. Here's the 5V rail at various places on the...

    Here's the 5V rail at various places on the board, with both an awful PSU and a decent PSU.

    https://i.imgur.com/Yz6Z4r8.png
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