The SWTPC 6800 computer system used a bit banger serial port based on the
Motorola MIKBUG ROM monitor. It was limited to 110 or 300 baud. The I/O card
(SWTPC MP-C) use a 6820 parallel interface. It was great when SWTPC released
a new ROM that allowed for a real serial chip (6850) and you could get your
TV Typewriter going at 1200 baud.
I later used my MP-C card to interface to an IBM Selectric terminal at 134.5
baud. I had to convert the ASCII to IBM code in software anyway.
Motorola MIKBUG
http://www.swtpc.com/mholley/MP_A/MP_A_Index.htm
SWTPC 6800 System
http://www.swtpc.com/mholley/swtpc_6800.htm
A 1978 picture of me at my Trendata 1000 Selectric terminal (IBM 2741
compatible).
http://www.swtpc.com/mholley/MySystem/MySystemPhoto.htm
Michael Holley
www.swtpc.com
----- Original Message -----
From: "Richard Erlacher" <edick_at_idcomm.com>
To: <classiccmp_at_classiccmp.org>
Sent: Sunday, March 24, 2002 7:00 AM
Subject: software UART
> If you don't mind listings provided as GIF files, here's one URL
> http://www.avocetsystems.com/company/articles/magazine/auart.htm
>
> Dick
>
>
>
Received on Sun Mar 24 2002 - 14:20:21 GMT