Image Map Image Map
Page 1 of 4 1234 LastLast
Results 1 to 10 of 37

Thread: IBM PGC appears "dead"

  1. #1

    Exclamation IBM PGC appears "dead"

    Ok, finally I took IBM PGC graphics card...very hard to find anyway.
    Its looks like new, totally shiny, but...without any image.

    I need the main info:

    1) IBM XT DIP switch is set to special graphic mode (EGA, VGA) 5(ON)6(ON) ok?
    2) Monitor TVM color is set to analog signal and automatic colors (PGC) mode ok?
    3) CGA emulation switch pins: [0-1]2 native, 0[1-2] CGA emulation, or?
    4) When is set CGA emulation its needed to set monitor to digital signal or its still analog?

    There are no error beeps on computer startup, normally boot to DOS.

    I tried all modes on the monitor, no image.
    IBM PC 5150(A): IBM PC 5150(B): IBM PC 5160 (64-256k): IBM PC 5160 (256-640k): IBM PC 5170 (099): IBM PC 5170 (319/339): IBM PC 5140: IBM PC 5162: IBM PC 5155: IBM PC Expansion Unit 5161:
    WANTED! : IBM 5175 monitor, IBM 5145 monitor, IBM PC screws,
    My IBM PC hardware collection

  2. #2

    Default

    All that sounds correct to me. The complicated parts of the PGC don't need to be working for the CGA emulation to display (using the same 640x480 analog signal as the high-function mode -- the 5175 isn't multisync nor has TTL signal capability).

    I'll be curious to hear if you resolve this as I have a couple Matrox PG-1280s with a similar failure mode (display only a solid white raster) but appears fully functional from a software perspective (using diags from a secondary display, with emulation disabled). I had a couple ideas for things to check but haven't had time to pursue them yet.

  3. #3
    Join Date
    Sep 2017
    Location
    Principality of Xeon
    Posts
    1,861
    Blog Entries
    1

    Default

    Trying setting the motherboard dip switches for CGA.

  4. #4

    Default

    I second that- the PGC card appears as a CGA card for most software, only specialized software knows about the PGC FIFO's.

    I have two PGC Cards in the basement. Have not plugged them into a computer in years.

  5. #5

    Default

    The PGC doesn't have a BIOS extension, and is meant to be used besides a CGA, MDA or EGA card (will even work alongside IBM's own VGA card too, but most clones have a BIOS that overlaps the PGC memory area). Like the 8514/a, the PGC is a secondary interface which needs to be used with software that supports it.

    You therefore need to set the switches to whatever other graphics card you have in there, and then using the MDA/CGA/EGA run your PGC-compatible software from DOS.

    Note about CGA emulation: It's still analog, yes, and you need the motherboard switches set to CGA.
    Current systems owned by me:
    Vintage:IBM PC/XT submodel 087 ( 1983 ), [Kon]tiki-100 rev. C (1983), Compaq Portable I ( 1984 ), IBM PC/XT submodel 078 ( 1985 ), IBM PC/XT286 ( ~1986 ), 3x Nintendo Entertainement Systems ( 1987 ).
    Obsolete:Commodore A500 ( ~1990 ), IBM PS/2 model 70/386 type 8570-161 ( 1991 ), Atari Lynx II ( ~1992 ), Generic Intel 486SX PC ( ~1993 ), AT/T Globalyst Pentium w/FDIV bug MB ( 1994 ), Compaq 486DX4 laptop ( ~1995 ).

  6. #6

    Default

    What software do you have that makes use of the PGC? I've written a good bit for it, uses the math coprocessor. Mostly RM Fortran-77 and assembly. The most used is a graphics package for making plots from x,y text files.

  7. #7

    Default

    I will try tomorrow. Only for clarification. CGA emulation is on jumper W1, when [0-1]2 is native mode and 0[1-2] is for CGA emulation? I have not found it anywhere
    IBM PC 5150(A): IBM PC 5150(B): IBM PC 5160 (64-256k): IBM PC 5160 (256-640k): IBM PC 5170 (099): IBM PC 5170 (319/339): IBM PC 5140: IBM PC 5162: IBM PC 5155: IBM PC Expansion Unit 5161:
    WANTED! : IBM 5175 monitor, IBM 5145 monitor, IBM PC screws,
    My IBM PC hardware collection

  8. #8
    Join Date
    Sep 2017
    Location
    Principality of Xeon
    Posts
    1,861
    Blog Entries
    1

    Default

    Truthfully, and to my eternal shame, I never saw my PGC work. I plugged it into a P166MMX and an AT. It didn't occur to me at the time that changing the moon switches could make a difference. My VM clone on the other hand worked readily in that Pentium box. Not sure if it did with the AT. That was a mish mosh of hardware to say the least. IBM 5175 + VM clone + P166MMX box I cobbled together to imagin disks. Worked nice though.

  9. #9

    Default

    The Pentium 166MMX- too fast for the PGC to work. It should have worked in an IBM 80286 based AT without problems. I used mine in a Zenith Z241, later in a Zenith 386/16 and a Compaq 386/20. I had to switch out to an Orchid Turbo PGA for the 386/26 and 486.

  10. #10
    Join Date
    Sep 2017
    Location
    Principality of Xeon
    Posts
    1,861
    Blog Entries
    1

    Default

    The VM card though has an 80188 operates at the same clock speed. It worked in the Pentium. Older 8/16 bit VGA cards work fine with Pentiums also.

    Could you post photos of the Orchid card.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •