Hi-speed serial interfacing from A2

[Steven Hirsch <snhirsch@gmail.com>]

I just _know_ there was discussion of this subject within the last year or so, 
but )&(^ Google doesn't turn up anything.  I'm interested in writing a 
filesystem driver to support an A2 as client on a DriveWire server.  This is a 
simple protocol developed for the Tandy CoCo, but it's generic enough to be 
adapted for almost any small box.

The CoCo can bit-bang serial communications at 115k baud, so I'm hopeful that 
something like this is possible for some flavor of Apple 2.  There was some 
talk of folks achieving hi-speed serial I/O on bus cards (Super Serial card?), 
but cannot find the thread.

Also, some years back Don Lancaster had some sort of bit-banging serial driver 
that used the game paddle connector to talk with a laser printer. Can't find 
any detail on that either, just some peripheral mention of it on the "Ask the 
Guru" website.

What is the overall picture in terms of max serial rate for the various 
machines - slot-based card, //c, IIGS?

Pointers to the pertinent message threads would be great.  I have the world's 
worst luck using Google for things like this.  No doubt the first person 
reading this will find it immediately and make me feel quite stupid.

Steve