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This forum is part of our mission to promote the preservation of vintage computers through education and outreach. (In real life we also run events and have a museum.) We encourage you to join us, participate, share your knowledge, and enjoy.

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Other suggestions
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Inboard 386/PC 2mb expansion CLONE

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    #16
    I know it has been a while and wanted to follow up. Due to other reasons I had to shelve this project right after the holidays, and hope to resume it one day!

    I had a 2MB board working rock solid with 8x256K 80ns SIMMs but was never able to get 4MB working stably with 8x512K SIMMs @ 80ns. I believe Jonas was able to. I'm sure I'll pick it back up but no idea on the timeframe.

    If it gets enough interest we can order another batch of prototype boards, or if anyone wants to continue the project here let me know!

    Here are a few more pics too. I had never designed a PCB of this complexity before (not to mention a daughterboard) but figured I'd take a stab at it. I was amazed that it mated to the InBoard so well and actually (mostly) worked, thanks to a lot of discovery and research done by stynx. It is a bit taller than the InBoard to accommodate the SIMM slots but it will fit in the XT case.





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      #17
      Nice! It would be great if it could be an 8MB daughter board....not sure if that would even be technically feasible. I'm already running Win 3.1 in enhanced mode with 5MB (using an exceedingly rare 4MB InBoard daughter card) - 9MB combined with the 486 CPU I had replaced might actually boot Win95 and/or OS/2 off a CF XTIDE LOL.

      Regards,
      Mike

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        #18
        mike Seeing your Mega XT blog post was what pushed me to actually pursue this project! lol. If I couldn't find an original, I had to make one! Luckily stynx and I got in touch and he was kind enough to share his work.

        I think it's safe to say that 8 should be possible but I think PAL mods and/or jumpers would be necessary.

        One of the potential problems we would have with trying to run Win95 is the weird stuff the InBoard does with the interrupts. I don't think it would run without some software mods. (Unless there's something you know that I don't!) I spent hours fiddling with those .386 files in the system.ini trying to get WFW 3.11 running (because networking) but ended up settling for WinSock on 3.1.

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          #19
          Originally posted by stynx View Post
          [ATTACH=CONFIG]64623[/ATTACH]
          Those are the weirdest looking lowercase L's I've seen in a text mode font!

          EDIT: Does quoting attachments not work anymore?

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            #20
            Originally posted by vwestlife View Post

            Those are the weirdest looking lowercase L's I've seen in a text mode font!

            EDIT: Does quoting attachments not work anymore?
            He's in the EU, so non-US Eng character map, I'd assume! It took us a while to ship boards between there and the US this fall!

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