Parity Checking in CPUs (was: Byte sizes...
Dwight K. Elvey
dwight.elvey at amd.com
Tue Mar 15 18:04:27 CST 2005
>From: "Eric Smith" <eric at brouhaha.com>
>> 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.
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 ).
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