Strange leon test rom behavior with sys 7

(Topic ID: 198798)

Strange leon test rom behavior with sys 7


By supermoot

1 year ago



Topic Stats

  • 11 posts
  • 5 Pinsiders participating
  • Latest reply 1 year ago by MarAlb
  • Topic is favorited by 3 Pinsiders

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    #2 1 year ago

    Hi,
    It look like a clock problem, and testing with another 6808 was a good idea. But, does the Phi2 signal (on pin 37 / 6808) stable ? did you check it using a scope ?
    I sometimes encounter strange clock behaviour (like a divide by 3 using a 7474 on 6502 systems ! ) and checking the clock at Phi2 is a base for repairing.
    May be, a good idea will be to replace the XTAL (CR1, 3.579 Mhz) and the two associated capacitors (C25 and C26, 27pF). A defective capacitor may lead to an unstable clock signal.

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