Plus/4 RS232 woes

From: Bo Zimmerman <bo_at_zimmers.net>
Date: Mon, 3 Sep 2018 02:49:19 -0500
Message-ID: <ed89da13-517f-4300-232e-8d941d293cf0@zimmers.net> 
Hello all,

After check both(!) books on Plus/4 programming, and the 6551 schematic, 
and doing experimenting... I have a question.  Does anyone know the 
kosher way to change the user port RTS signal so that the modem knows to 
stop transmitting data while a program catches up?  I'm initializing the 
Command Register to 5 (RTS low/enabled, DTR enabled, IRQ, no party, no 
echo).  But bad things seem to happen when I attempt to touch it again 
to change RTS to high/disabled.  Does anyone have any knowledge or 
experience with this?

- Bo
Received on 2018-09-03 10:00:05

Archive generated by hypermail 2.2.0.