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Is anyone interested with the Z80?

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The Z80 is still manufactured today and I was wondering whether there is any interest for a community or discussion group.

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  • in reply to e14 Contributor

    As they say in Mortal Kombat - "Most Impressive!"

     

    For NMOS CPUS I'd use higher value pull down resistors to cater for the one TTL (or 4 LSTTL) load limit.

     

    If you put an 8 way dip switch in series with R1-R8 and a LED and current limiting resistor on the /HALT pin to VCC you can perform other programs.

     

    Here are some examples to try;

    11000011  C3  -> JP C3 C3 (continually loops at address C3C3 through C3C5

    01110110  76 -> HALT     (Turns the HALT LED on - and Address LEDS still change value (for REFRESH))

    00011000 18 18 -> JR (+18) similar to the NOP loop but in bigger steps.

    11001001 C9 -> RET

    11001101 CD -> CALL CDCD

    11010011 DB DB -> IN A,(DB) (If you hook up a LED and current limiting resistor to the /IORQ line to VCC - it should blink)

    10101010 10 10 -> DJNZ +10