26 Jan
2014
26 Jan
'14
3:04 a.m.
Tony Duell wrote:
[7201 .vs. Z80-SIO)
OK, there are 8 data liens and 2 address lines, and a chip select.
But the actual cotnrol lines are quire different. The 7201 hads Rd/ and
Wr/. The Z80-SIO, like most (all?) Z80 peripheral chips makes do with
Rd/,. It also takes IORQ/ and a clock of the same freqeuncy as the CPU
and if there is no read at the apporpriate time, it assumes it's a write
cycle. Dido the intterupt acknowledge.
In my experience the Z80 peripheral chips are a right pain to use with
anything other htan a Z80. The 7201 can be linked to just about any CPU.
-tony
I wouldn't say that using Z80 chips on other CPUs are problematic, the only
thing you have take care about is the RETI Instruction that is decoded from
the Chips to reset the interrupt Chain.
I've experimented with an Z80-CTC on a Z8001 CPU which has such a different
Bus. The Problem was easy to solve with only a GAL16V8.
Otherwise the 7201 isn't that easy to use for processors other than the
8086 family since it want's 3 Int ACK Pulses.
Regards,
Holm
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The bus
itnerface signals are rather different too.
Yes, the Pinout is very different, but the signals, altough they have
different Names, are very similar.