Image Map Image Map
Page 2 of 3 FirstFirst 123 LastLast
Results 11 to 20 of 30

Thread: Compaq Portable + Compaq EGA

  1. #11

    Default

    As a last follow-up, I decided to treat the switches on the back of the card just like the IBM EGA, which is well documented. Of course Compaq was very diligent in replicating IBMs feature set, so it was no surprise that the IBM monitor switch setting on the IBM card were replicated on the Compaq EGA card. My Portable now boots into the hi-res text mode, as opposed to the 640x200 mode it was set to. No need to play around with MODE.EXE to fix it. The switch setting on the back of the card look like this, for anyone searching in the future:
    IMG_0877.jpg

  2. #12
    Join Date
    Dec 2008
    Location
    United States of America
    Posts
    74

    Default

    Was this EGA card a fully Compaq designed product? If not, it may have a non-Compaq branded cousin listed somewhere on TH99.

  3. #13

    Default

    Quote Originally Posted by Moogle! View Post
    Was this EGA card a fully Compaq designed product? If not, it may have a non-Compaq branded cousin listed somewhere on TH99.
    It's a Compaq PCB and BIOS using a C&T chipset. What makes it so unique is the internal header for connecting to the Portable's CRT and the timings to work with its dual frequency operation.

  4. #14

    Default

    COMPAQ EGA board SW1 (1 2 3 4) as primary display adapter; these configure default video mode at boot time

    color 80x25 (640x350) - off on on off
    color 80x25 (640x200) - on on on off
    color 80x25 (640x200) - off off off on
    color 40x25 (320x200) - on off off on
    mono 80x25 (720x350) - off off on off
    mono 80x25 (720x350) - on off on off

    The two 640x200 color modes differ in that the second one also supports RGBI color monitors, in addition to the COMPAQ color monitor, EGA monitor, or COMPAQ Dual-Mode monitors the first supports. I'm not entirely sure what that means in technical terms.

    The two mono modes differ only in which mode is allowable for a secondary color board (80x25 for the first, 40x25 for the second). both modes only support the COMPAQ Dual-Mode monitor.

    COMPAQ EGA board SW2 (1 2 3 4 5 6); these configure the attached monitor.

    External monitor: SW2 - 1 & 2
    COMPAQ Color Monitor or EGA - off off
    COMPAQ Dual-Mode monitor - off on
    RGBI color monitor - on off
    no external monitor - on on

    Internal monitor: SW2 - 3
    COMPAQ Dual-Mode monitor - off
    no internal monitor - on

    Reserved: SW2 - 4, 5 & 6 (always on off on)

    COMPAQ EGA board JP1; external monitor type
    COMPAQ Color monitor or EGA - 1&2
    COMPAQ Dual-Mode or RGBI - 2&3

    JP3 (always 1&2)

  5. #15

    Default

    Thanks for all that! Do you have the manual for the Compaq EGA (and where were you three months ago )?

  6. Default

    Hi, can you post the pinout of the cable of the internal monitor of the portable?
    I have an EGA wonder and I am trying to do the same thing. Also can you post a photo of the internal connector of the Compaq EGA to internal monitor?

  7. #17
    Join Date
    Jun 2019
    Location
    Portland, OR
    Posts
    14

    Default

    Quote Originally Posted by ghosthuntergr View Post
    Hi, can you post the pinout of the cable of the internal monitor of the portable?
    I have an EGA wonder and I am trying to do the same thing. Also can you post a photo of the internal connector of the Compaq EGA to internal monitor?
    For reference, the pinout of the VDU->CRT connector on my system is:

    ----------------
    | 1 2 3 4 || 5 |
    | 6 7 8 9 || 10|
    ----------------

    1 - Red - VSync - Negative Pulse ~150us All Modes, 50Hz MDA, 60Hz CGA
    2 - Black - CGA Mode Active? - High in CGA mode, low in MDA mode. My CRT appears to multi-sync and ignore this.
    3 - Orange - Analog video data - ~3V max observed
    4 - Brown - Hsync - Positive Pulse ~5us All Modes, 15.7kHz CGA, 18.5kHz MDA
    5 - Grounding Strap
    6,7,8,9 - White - Video Ground
    10 - NC

    See: http://www.vcfed.org/forum/showthrea...paq-Portable-1

  8. #18
    Join Date
    Jun 2019
    Location
    Portland, OR
    Posts
    14

    Default

    Quote Originally Posted by ghosthuntergr View Post
    Hi, can you post the pinout of the cable of the internal monitor of the portable?
    I have an EGA wonder and I am trying to do the same thing. Also can you post a photo of the internal connector of the Compaq EGA to internal monitor?
    http://www.vcfed.org/forum/showthrea...paq-Portable-1

    For reference, the pinout of the VDU->CRT connector on my system is:

    ----------------
    | 1 2 3 4 || 5 |
    | 6 7 8 9 || 10|
    ----------------

    1 - Red - VSync - Negative Pulse ~150us All Modes, 50Hz MDA, 60Hz CGA
    2 - Black - CGA Mode Active? - High in CGA mode, low in MDA mode. My CRT appears to multi-sync and ignore this.
    3 - Orange - Analog video data - ~3V max observed
    4 - Brown - Hsync - Positive Pulse ~5us All Modes, 15.7kHz CGA, 18.5kHz MDA
    5 - Grounding Strap
    6,7,8,9 - White - Video Ground
    10 - NC

  9. #19
    Join Date
    Jun 2019
    Location
    Portland, OR
    Posts
    14

    Default

    Can you tell us the Compaq Assembly number of your Portable EGA card?

  10. #20
    Join Date
    Jun 2019
    Location
    Portland, OR
    Posts
    14

    Default

    Quote Originally Posted by rdmguy View Post
    Can you tell us the Compaq Assembly number of your Portable EGA card?
    Nevermind, I found the part numbers: 000410-003 and 000412-001. I actually managed to locate one on ebay! Catacombs 3D, here I come!

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
  •