cctech Digest, Vol 78, Issue 3
cclist at sydex.com
Fri Feb 5 17:51:54 CST 2010
On 5 Feb 2010 at 23:04, Tony Duell wrote:
> I am trying to think of where the 8255 was used. OK, on the 5150 and
> 5160 motherboard to handle the keyboard interface and DIP switches,
> where glitches don't matter. What other major uses did it have? Very
> frw of my classic computers use one.
Quite a few 8-bit x80 micros used them them for various purposes
(yes, even Z80 systems); The 5150 BIOS refers to an 8255 in the
printer code, even though they didn't use one. A FAX machine I
looked at not long ago used one. I've got a 90's PCI-bus data
aquisition card that uses 3 of them.
But there really is no good reason to use an 8255, a Z80 PIO, a 6820
or even a 6522 in a new design today, other than for nostalgia's
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