[Coco] Reading data through the bitbanger port

[tim lindner]

On Mon, Mar 29, 2021 at 10:04 AM Salvador Garcia via Coco
<coco at maltedmedia.com> wrote:
>
> Hi all, I am interested in knowing how the CoCo serial port works.

You have to use assembly language, because the signals change way too
fast to handle in BASIC.

But the short and sweet info dump is:

Read serial data by reading $FF22 bit zero.
Write serial data by writing to $FF20 bit one.

http://tlindner.macmess.org/wp-content/uploads/2006/09/cocopias-R3.pdf

Here is a nice article about the RS-232 protocol, both software and
hardware aspects.

http://wilsonminesco.com/RS-232/RS-232primer.html



-- 
--
tim lindner

"Proper User Policy apparently means Simon Says."