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Thread: Compaq Portable, Portable Plus, and Deskpro BIOS ROM J, 106265-002

  1. #21
    Join Date
    Feb 2018
    Location
    Toronto, ON, Canada
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    43

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    Quote Originally Posted by kgober View Post
    I have this information from the Compaq "Service Quick Reference Guide" which is a small spiral-bound book.
    If you ever consider scanning it, I would be very very grateful! Even phone photos would be ok.

  2. #22
    Join Date
    Feb 2018
    Location
    Toronto, ON, Canada
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    43

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    Folks, is there some place I can download Compaq setup disk image for Deskpro 286 2550 (8mhz)?

    I downloaded something from here: https://archive.org/details/CompaqPo...DiagnosticDisk

    But it's 720kb and I don't have 3.5" floppy in my Deskpro 286, only 5.25".

    Update: I needed ftp://ftp.hp.com/pub/softpaq/sp0000-0500/sp0316.zip. It is the same as ftp://ftp.hp.com/pub/softpaq/sp0000-0500/sp0308.zip but uses two 360k disks instead of one 720k.
    Last edited by dhau; August 6th, 2020 at 09:02 PM.

  3. #23

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    Quote Originally Posted by Casey View Post
    Is there a simple way to tell which bios your system has? It never occurred to me to look.
    If you can boot the Compaq, the byte at F000:FFE6 is the revision.

  4. #24
    Join Date
    Feb 2018
    Location
    Toronto, ON, Canada
    Posts
    43

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    Hi folks, just wanted to thank you for the information and links provided. I successfully upgraded the BIOS on my Deskpro 286 model 2550 from D to S.1.

    I used what I had: two winbond w27e257-12. Those are 32KB, so I doubled each rom:

    copy /b u28.bin+u28.bin u28.32k
    copy /b u29.bin+u29.bin u29.32k

    I burned those, installed u28 in upper socket and u29 in lower, that didn't work. I swapped, and now it works!

    Also, in checkit, speed went from 7.9 to 8.01 MHz. I guess it is because old BIOS ROMs were 200ns and new are 120ns.

    S.1 roms are from here

    bios-before.jpg

    bios-after.jpg
    Last edited by dhau; August 25th, 2020 at 02:19 PM.

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