Sunday, 5 July 2009


A very frustrating day, first I blew my last LCD panel by getting the power connections mixed up...

Then about 6 hours trying to figure out an intermittent problem that has now become permanent:
  • Stepping through program slowly / by hand register contents are random
  • Sometimes works at full speed
  • Sometimes randomly jumps out of program
Tomorrow will have a few checks:
  • Is interupt /NMI getting generated? I've not noticed any IORQ + M1s - these lines should be pulled high
  • Is ROM corrupted - had trouble then it worked then trouble so doubt its the ROM
  • More decoupling!
  • Buffer memory data bus?
Very frustrating!

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