27 Mar
2007
27 Mar
'07
4:14 p.m.
Jules Richardson wrote:
Does anyone know if the above is identical in spec to the "official" Zilog PIO
chip? The manual's dated November 1976 and stamped as preliminary, which is
a little unsettling :)
I want to do some messing around with a Z80 CPU and PIO, and having a physical
paper reference to hand would sure be useful - I'm just not sure if I'm going
to shoot myself in the foot using this particular one!
I should go and google for Zilog / Z80 history I suppose to see where Mostek
fit into things - I've got a rather thick Mostek UK Z80 programming manual
(V2.0) too which would also make a useful reference, assuming it's sound for
all Z80 chips regardless of source...
Not quite a definitive answer, but the ECG cross-reference shows the Z80-PIO
replaceable by ECG type 3881. Or more precisely:
3881
Z80A-PIOB1
Z80A-PIO-CS
Z80A-PIOD1
Z80A-PIO-PS
Z80-PIOB1
Z80-PIO-CS
Z80-PIOD1
Z80-PIO-PS
all cross-ref to ECG 3881.
That would (should) make the 3881 a plug-in replacement for the Z80-PIO (not
just a "use in new design" type), but I guess it leaves open the possibility
of some additional functionality in the 3881.