Last time I checked, OKI still made the 82C55. Also, I have been
looking at the MCP23016 I/O expander. It uses I2C as the interface
and is made by Microchip. There is definitely a speed limitation,
so using it for memory might not be good. But hey, maybe you can
put some of your other hardware on one and then free up PIC pins
for accessing memory at high speed.


Andrew


On Thu, Apr 15, 2004 at 03:02:25PM +0100, Alan B. Pearce wrote:
> >the 82C55A was commonly used for this. Not sure if it is still
> >made, but I imagine there are similar upgraded devices today...
>
> It is still made, mainly by Asian sources, although Intersil also seem to
> source it for the 80C86 line that they do.
>
> another possibility along the same lines would be the Motorola PIA, but the
> part number escapes me, 6850? or was that the UART?
>
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