[sdiy] Prophet 5 Q & which z80?

[Ken Stone]

That sounds like the basic Z80 CPU.
A Z80 CPU, Z80A CPU or Z80B CPU should all work in there fine. Why do I
specify CPU? because there are Z80 SIO, Z80 PIO etc also which aren't what
you want.

Ken

>
>HI All:
>
>I've got this P5 that's been driving me crazy - i finally had to bring it
>somewhere to get repaired.
>
>basically, right now it goes through it's tuning procedure & looks like it
>comes up ok, but when you press a key, you it just makes a click (ie really
>fast attack & decay)... the kb scanning *might* be ok (it sounds as though
>the clicks are the right pitch, but really hard to tell)
>
>the repair tech tells me that the address lines (a0-a2) from the z80 don't
>have any action on them & they *should*.  it seems as though the mux's are
>not getting a proper clock -  So, he says the z80 is most likely bad.  the
>crystal timing circuit seems to be ok.
>
>2 q's:
>
>- does this diagnosis make sense?
>- the cpu is basically just labelled a z80.. .Now, there are a million
>different types... what is the right one that goes in the P5?  it's a 40 pin
>one.  I think it's ttl - will a cmpos one work ok i i can't find a ttl?
>
>thanks!
>paul
>
>
_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au  
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
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