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  1. Replies
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    joeyd3119 Pay attention to this book...

    joeyd3119 Pay attention to this book
    http://publ.lib.ru/ARCHIVES/D/DODEKA/Vse_otechestvennye_mikroshemy.(2004).[djv-fax].zip
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    http://www.cpu-ns32k.net/Matrox.html

    http://www.cpu-ns32k.net/Matrox.html
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    2,599

    Chuck(G) > I Ican use an ST506 drive to record,...

    Chuck(G)
    > I Ican use an ST506 drive to record, or any other modulation scheme, such as FM or Manchester encoding

    One TV static frame fits just on a single track on a typical MFM HDD rotatating...
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    For old PIC families the PICKIT2 is better than...

    For old PIC families the PICKIT2 is better than PICKIT3 (IMHO). Clones are still available at aliexpress/ebay/amazon.
    (It's rather cheap so you could buy both, including 'free' PCB with socket )
    ...
  5. RiP2 Did you try 3.3.0 ? BIOS collection:...

    RiP2 Did you try 3.3.0 ?
    BIOS collection:
    http://minuszerodegrees.net/rom/rom.htm
    (search Seagate)
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    XUB does not boot disk formatted by ADM. I've...

    XUB does not boot disk formatted by ADM.
    I've found a bit newer version of ADM (at warez site, sorry)
    http://old-dos.ru/files/file_887.html
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    XT IDE Universal BIOS bug? I've found an old...

    XT IDE Universal BIOS bug?

    I've found an old XT-compatible computer with WD-1002 MFM controller and ST-225 HDD.
    HDD is formatted with MITAC ADM v1.0 and divided onto two partitions (10Mb+10Mb)....
  8. Ruud Don't bother! I'm just telling it's not a...

    Ruud Don't bother! I'm just telling it's not a (your) software problem!

    Both my motherboards (semi-dead and working) are XL-7 Turbo, rather popular (and clonable :) ) Taiwanese Turbo XT.
    Later...
  9. Ruud thank you for support. Unfotunately my...

    Ruud thank you for support.

    Unfotunately my XT-clone motherboard is faulty. It hangs forever when I/O card trying to use IOCHRDY ISA signal.
    My CGA card has slow DRAM so it uses IOCHRDY. Hence it...
  10. Ruud Read a Private Mail please. I'm trying to...

    Ruud Read a Private Mail please.

    I'm trying to repair a dead XT clone (taiwanese XL-7 motherboard). I've replaced dead 2x74LS245 and one 74LS273 (a latch on hi addresses between CPU and ISA...
  11. Good book: "The Art of Electronics" by Horowitz...

    Good book: "The Art of Electronics" by Horowitz and Hill
    https://en.wikipedia.org/wiki/The_Art_of_Electronics
    https://artofelectronics.net/
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    Kaigan Unfortunately I did not find any books...

    Kaigan Unfortunately I did not find any books explaining PC schematic in detail. You may find Intel databook useful...
  13. "Early MSDN CD’s on archive.org"...

    "Early MSDN CD’s on archive.org"
    https://virtuallyfun.com/wordpress/2019/03/27/early-msdn-cds-on-archive-org/
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    1) Check a RESET circuits (CPU and i8284) 2)...

    1) Check a RESET circuits (CPU and i8284)
    2) Check a clock generator circuits (witch oscilloscope, i8284). Quartz is fragile.
    3) Check address and data lines are not connected to ground (w/o power...
  15. OK, I will try to add OAK OTI077. I have this...

    OK, I will try to add OAK OTI077. I have this 8-bit VGA card and have nor MDA nor CGA...
  16. Ruud JFYI: A VGA initialization sequence for OAK...

    Ruud JFYI: A VGA initialization sequence for OAK OTI077 and Trident 9000i (also known by Sergey Kiselev's 8-bit VGA)
    It would be good to add it as optional module for diagnostic ROM....
  17. JUKO, Acer, Faraday and another 'chipset'-based...

    JUKO, Acer, Faraday and another 'chipset'-based XT boards are hard-to-reair... Memory tester is only useful feature or you have to replace a 'chipset'.
  18. I'm trying to reapir XT clone motherboard but I...

    I'm trying to reapir XT clone motherboard but I have no CGA nor MDA cards. Will your test ROM work with (uninitialized) VGA ?
  19. CPU test is very useful since there are alot of...

    CPU test is very useful since there are alot of "fryed" CPUs (i.e. NEC V20) from China.
    https://www.youtube.com/watch?v=L4WplIZ02cI
  20. JFYI: There was yet another "branded" SYSVR3 from...

    JFYI: There was yet another "branded" SYSVR3 from the Wyse, but earlier version 3.2.1A
    It was virtualized recently.
    https://virtuallyfun.com/wordpress/2012/12/07/wyse-unix-lives-again-sort-of/...
  21. I've successfully run Microport V/386 (System V...

    I've successfully run Microport V/386 (System V 3.2.2) on the PCem v14. The only issue is a video - it does something wrong with VGA so use GCA/80.
    The emulated machine is "AMI 486", HDD type is 9...
  22. Tested with XT-turbo clone, LPT card and 8 LEDs:...

    Tested with XT-turbo clone, LPT card and 8 LEDs:
    http://wiki.sensi.org/images/ISA_LPT_LEDs.jpg
    (DB-25, 8 LEDs and 8 resistors 240Ohm in serial).

    It WORKS but it's rather uncomfortable to read...
  23. The Microport and AT&T 6386 versions SysVR3 are...

    The Microport and AT&T 6386 versions SysVR3 are very close, 3.2.2 (Microport) and 3.2.3 (AT&T 6386).
    ISC version is slightly different.

    Unfortunately both Microport and AT&T 6386 SysVR3 have no...
  24. It seems there is another issue with port 80h, XT...

    It seems there is another issue with port 80h, XT and new POST card. AFAIK new POST cards work in the Slot8 on the original IBM PC XT 5160 motherboard. Slot8 is an internal motherboard bus to access...
  25. Port 80h is a DMA0 ''page" or "segment" register...

    Port 80h is a DMA0 ''page" or "segment" register implemented in 74LS670 (since i8237A can't cross 64K boundary).
    DMA0 is used for refresh RAM (reading any sequential addresses) so it should be safe...
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