Saturday 11 July 2009

Memory problems

There are still a few problems with memory, running a memory test routine at 4MHz throws up a few spurious errors every now and again, fewer at 2MHz and non so far at 1MHz....more capacitor swapping might be in order. I'll get the soldering iron warmed up!

I've got a simple PS/2 PIC microcontroller program working - well it will display the scan code of the currently pressed key on a row of LEDs and send / receive keyboard commands. I'll hook this up to the PIO when I get it going.

First though I think I'll have a crack at getting the SIO going. I've got an SIO/2 chip here and a MAX232, should be enough to get a terminal interface going!
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2 comments:

  1. Whizzkid12 July 2009 at 08:50

    Hi There dominic

    great work on your z80

    i have sent this message both to blogger and youtube

    i too am building a z80 from scratch and am not getting very far lol

    i have the idea in my head and the schematics in my head

    i was wondering if u used msn if i may add u to discuss both your and mine z80 together

    thanks

    Barry

    ReplyDelete
  2. Dominic Beesley12 July 2009 at 09:12

    Thanks Whizzkid, I'll message you on Youtube

    Dom

    ReplyDelete

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