cctech Digest, Vol 78, Issue 3

[Chuck Guzis]

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 
sake.

--Chuck