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Re: MZ-80K displaying garbage chars on screen
Posted: Sun Oct 10, 2021 4:05 pm
by S_U_C
You reported that pin 26 is low, look at the power on reset circuit.
The Z80 only needs a short low pulse to reset itself.
It must he high for the Z80 to run.
Re: MZ-80K displaying garbage chars on screen
Posted: Sun Dec 26, 2021 3:56 pm
by charminator
fetch all RAM ics and clean the contacts ... i just had this issue with some dust on the chips. And i had to replace my system EPROM ... a fresh burnt one runs fine.
Have an eye on the tantal caps inside the powers supply and dont forget to check the cap in the power SWITCH
Re: MZ-80K displaying garbage chars on screen
Posted: Mon Dec 27, 2021 5:35 pm
by hlide
Good!
