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

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    That looks very useful. Thanks!


      Originally posted by dhau View Post
      In my Compaq Deskpro 286 model 2550, I have two ROM chips 105620-001 and 105622-001. I wonder what BIOS versions that is.
      Yours is revision D.

      It looks like Revision K marks the introduction of the 12MHz Deskpro 286 because that was the first available ROM available for it, and all ROMs after that were available for both the 8MHz and 12MHz models (same part numbers): K, M, N.3, P.1, R.2, and S.1. The 8MHz lists all those, plus these earlier revisions: A B C D E F G J.


        Originally posted by kgober View Post
        Yours is revision D.

        It looks like Revision K marks the introduction of the 12MHz Deskpro 286 because that was the first available ROM available for it, and all ROMs after that were available for both the 8MHz and 12MHz models (same part numbers): K, M, N.3, P.1, R.2, and S.1. The 8MHz lists all those, plus these earlier revisions: A B C D E F G J.
        This is awesome, thank you! Where did you find this information?

        Also, where can I find a later version of ROMs? Like this S.1 version?

        And last question: is it possible to replace 2 roms in my magnum card with the AMI/AWARD/Quadtel ROMs from -0c site?


          It looks like those are the same as the portable II. If you look on the link above from modem7 you’ll see a couple of newer versions for that system.


            Yes, just like with the original (8086) Deskpro and the Portable, the list of ROMs is the same for the Deskpro 286 8MHz and the Portable 286 (also commonly known as the Portable II). I have this information from the Compaq "Service Quick Reference Guide" which is a small spiral-bound book. I understand there was also a version of this available in PDF format at one time (several hundred small files, one file per chapter) but which I cannot now find online. Perhaps it was on a Compaq support CD.


              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.


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

                I downloaded something from here:

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

                Update: I needed It is the same as but uses two 360k disks instead of one 720k.
                Last edited by dhau; August 6, 2020, 09:02 PM.


                  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.


                    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


                    Last edited by dhau; August 25, 2020, 02:19 PM.