[Coco] WiFi modem.

[RETRO Innovations]

On 1/20/2018 2:12 AM, Gene Heskett wrote:
> I don't recall writing the above, Jim.
Yep, I forgot to clean out the attrib line.
> I've not been advised what the
> differences are between the 65C51S and the 65C51N that I can get from
> the likes of Mouser.

Both are the 65c51N from Western Design Center.  There are two 
variants.  S version and N version:

https://en.wikipedia.org/wiki/WDC_65C51

Note that one or both 65c51N variants have a serious transmit register bug

http://forum.6502.org/viewtopic.php?f=4&t=2543&start=90
> Obviously for new designs, one should use the
> smaller square version packaging, but does that lend itself to
> piggy-backing like the minidips for a poor man's dual port?
Not really.  PLCC cannot easily be straightened.
> I again do
> not know if tsop legs can be straightened to stack them. It may be that
> with the modern packaging, just lay out a 2nd pattern so that a 2nd chip
> can be added later if a dual port is needed,
This would be preferred.  And,it's no big deal to lay out a second ACIA 
on the PCB.

Jim