This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
Make sure that your serial ports are connected together, and run the comm
program on your PC. Now, for our purposes, lets assume you have the serial card
in Slot #2.
Force the PC into terminal mode; and, make sure that the PC and II's baud rates
are the same-- at least 9600 for a fairly speedy transfer.
Make sure the ][ is displaying a 40-column screen.
Now, try typing "IN#2" on the ][. Type something on the PC. It should appear
on the Apple. (Cool, ain't it?!)
In fact, try typing "PR#2". On either computer. Now, you should get an
Applesoft prompt on your terminal screen! In fact, you can use the PC comm
program as a keyboard for your ][!
All right, at this point, you should have data flying back and forth between
the two machines. On the ][, type "POKE 33,33".
Now, on the PC, tell your comm program to start a text capture. Tell it to add
line feeds after carriage returns.
On the ][, load the BASIC program, and type LIST. The program listing will
appear on the Apple screen and be dumped into the PC comm program's capture
buffer.
To break communications, type "IN#0" and "PR#0" on the ][.
By: Brian Hammack
 
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