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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?

    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


      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.


        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.


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


            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.


              I meant IRQ controllers U5/U6


                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.


                  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



                    Good 'ol ebay


                      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