identifying PC Simms

Jules Richardson julesrichardsonuk at yahoo.co.uk
Sat Oct 1 10:40:18 CDT 2005


Chuck Guzis wrote:
>>Isn't that the other way around? Nearly all PCs I've come across don't 
>>care about parity, but the rest of the world always seemed to make use 
>>of it.
> 
> Nope, PC's right up through the PS/2 used NMI (int 2) to 
 > memory parity and bus errors, as well as 80x87 exceptions.

Interesting. I do recall the real IBM hardware using parity, I've 
obviously misremembered the parity situation during the days of clones 
and 30 pin SIMMs though!

My impression was always that Mac hardware was better designed and less 
kludgy, so it seems a little surprising that they'd throw away the need 
for parity whilst the "make it as cheap as possible" PC manufacturers 
kept it.

cheers

J.


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