15 Mar
2005
15 Mar
'05
4:04 p.m.
From: "Eric Smith" <eric at
brouhaha.com>
river wrote:
Hi
Giving it some thought, the only compute application
for parity that I can think of would be reverse bit
swapping. This is generally done on an address though
and might not be all that useful on a byte value.
( FFT's often need this function ).
Dwight
Yes, the 8080/8085/8086 series chips did parity
checking. The PSW had a
flag for odd/even parity. Naturally, the Z80, being a superset of the 8080,
also had this ability.
In that regard, the Z80 is not a proper superset of the 8080. The
parity flag is usurped to act as an overflow flag after arithmetic
operations. It is still partity after moves and logical operations.
Eric