31 Jul
2005
31 Jul
'05
7:09 p.m.
Subject: Serial Configurations (was Devilish Altair Serial ConfigurationProblem)
From: "Richard A. Cini" <rcini at optonline.net>
Date: Sun, 31 Jul 2005 12:35:05 -0400
To: "'General Discussion: On-Topic and Off-Topic Posts'" <cctalk
at classiccmp.org>
All:
The problems I'm having have to be related to status bits and
device initialization. The board is an SSM 2p+2s which is based on the
TMS6011 (which has lots of equivalent UARTs such as the COM2502, 2017,
TR1402, AY3-1015). The SSM board is very flexible -- I can change status
bit order and polarity to match almost any configuration need. Right now
I have it strapped to match the Altair Revision 1 SIO board (ports 0/1,
RxStat=bit0, TxStat=bit1, active high polarity). I've also tried TxStat
at bit7.
That should work.
Does someone have sample working code for initialization, input
and output? I have a few datasheets but none of them give sample code
sequences. I'm missing something here and I'd appreciate a push.
OH, one more detail.. Most of the MITS software when loaded inits
based on the front pannel sense switches (IN FFh). The configuration
sets the board in use and bits. T he setting are in the MITS software
manuals.
Allison