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Xi8088 won't boot

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    Xi8088 won't boot

    Having a problem with my Xi8088. The machine will POST (through code 00), I can see RAM count, ROM code is seen and executed if existing.

    two issues:

    1. The keyboard does not work
    2. The machine POSTs all the way to "Booting OS", but then won't go further.

    Any thoughts on where to go from here?

    #2
    My first thought: do you have the correct keyboard controller? I had various keyboard controllers laying around and none worked. At the end Sergey had to send me one. And it is possible that a bad controller is the cause of your second problem.
    With kind regards / met vriendelijke groet, Ruud Baltissen

    www.baltissen.org

    Comment


      #3
      It is very possible that I have a bad keyboard controller, but I don't have a spare to test with. I used a VIA VT82c42N as suggested.

      Comment


        #4
        What crystal are you using right now? Depending on parts you used, it may not work well above ~4.77MHz, so I'd start at 14.31 xtal. If it works, then more to may be 24, then 30 and finally to 36.

        Comment


          #5
          I use LS parts and it works well with a 36 MHz crystal.
          With kind regards / met vriendelijke groet, Ruud Baltissen

          www.baltissen.org

          Comment


            #6
            I'm using a 30MHz Crystal and a V20 CPU. The BIOS POST screen is great, just won't "do the next thing" - POST code is 00

            This board has some LS parts, some F parts, I double checked that all parts are in the right place.

            I don't know other than "boot the OS" what the next part in the cycle is, so not sure what to troubleshoot on that front.

            Yesterday I tested RAM and I swapped the DMA controllers with no improvement.

            I've also reflashed the ROM a few times and it gets to the same spot each time.

            Today I'm trying to trace out the connections between the VT82c42N and the PS/2 port to make sure the CLK and DATA signals are making it.

            Comment


              #7
              I meant IRQ controllers U5/U6

              Comment


                #8
                Following up on this, I figured out why newer ROMs wouldn't flash - MacOS uses a different default language and the command that was `tr "\000" "\377" didn't produce `FF` hex like it should have. After that fix and some additional tracing/testing/troubleshooting, I'm now getting an "08" POST Code that continues to lead me down the "bad VT82c42" route. I've ordered a 10pk and we'll see how that works out. I'm fairly certain I won't wind up with 11 bad keyboard controllers, but you never know.

                Comment


                  #9
                  Originally posted by TO. View Post
                  I've ordered a 10pk and ...
                  Where did you order them?

                  With kind regards / met vriendelijke groet, Ruud Baltissen

                  www.baltissen.org

                  Comment


                    #10
                    Good 'ol ebay

                    Comment


                      #11
                      New keyboard controllers arrived, no joy. Although I don't think its the backplane causing grief, I've ordered a 2nd backplane and we'll see if that is the problem. If not, I'm also looking for a 486 SBC

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