> Intel's web site still has some information abotu the 8255:
>
> www.intel.com/design/periphrl/overview/7190.HTM
> www.intel.com/design/periphrl/technote/7012.HTM
>
http://www.intel.com/design/periphrl/datashts/index.htm
>
> I have used this chip a LOT in the past, and still have a 1978 edition of
> the Intel Peripheral Design Handbook... what would you like to know? It
> provides three independent 8-bit I/O ports. Each can be set for input or
> output, and PORT C can be split 4 bits in and 4 out. CPU interface is
> pretty standard, 8 bit data bus, !CS, !WR, !RD, and A0/A1 to select port
> or config register. The last link above will score a complete data sheet
> for you from 1995.
>
> It's really a pretty old chip, and a lot of what you'd want to do can be
> done with a 16F877. The '55 had a pretty low drive capacity, nothing near
> the PIC's. Still, it was really the standard for many years, used in
> numerous PC I/O cards, data acquisition cards, etc. I think they're
> probably still made by companies other than Intel and probably still used
> in some products.
>
> Dale
> --
> "Curiosity is the very basis of education and if you tell me that
> curiosity killed the cat, I say only the cat died nobly."
> - Arnold Edinborough
>
>
> On Thu, 25 Jul 2002, Richard Mellina wrote:
>
> > Anyone know of any good websites concerning the 8255-PPI from
mitvma.mit.edu
