SWTPC 6800

[Brad H]

Yes.. I tried 7 bits.. different parity settings, speeds etc.  Couldn't quite nail it down.  In every tutorial online for the 6800 being used with PC terminal, they go 8 N 1.. nobody mentions specifically if you are supposed to use hardware or xo/off or nothing though.  So that's another thing.  I'm also confused because some docs mention baud rate settings for the cpu board?
I'm also not sure if bad RAM or bad TTL etc could be contributing to just throwing out random junk too.


Sent from my Samsung device

-------- Original message --------
From: Dave Wade <dave.g4ugm at gmail.com> 
Date: 2016-08-04  11:33 PM  (GMT-08:00) 
To: "'General Discussion: On-Topic and Off-Topic Posts'" <cctalk at classiccmp.org> 
Subject: RE: SWTPC 6800 

"Random Stuff" on serial ports can be a speed, data-bits, or even parity
mis-match. 
I assume you have tried tweaking these?

Dave

> -----Original Message-----
> From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Brad H
> Sent: 05 August 2016 06:58
> To: 'General Discussion: On-Topic and Off-Topic Posts'
> <cctalk at classiccmp.org>
> Subject: RE: SWTPC 6800
> 
> I think this 6800 is live but I am being dogged by my inabilities when it
comes
> to cabling.  I'm going to purchase a 'proper' db25 female connector and
the
> molex pins for the MP-S connector and solder it up.  I tried sort of using
> jumper wires to make it go.  When I turn the 6800 on, the PC terminal I'm
> using reacts by producing single or strings of random characters.
> According to the SWTPC 'system checkout' stuff, if I get anything at all
> showing up on the terminal it usually means the 6800 is alive.  Based on
the
> notes written on the MP-S, I'm confident I have the correct baud rate and
bit
> (8) and parity (1) settings, but alas, doesn't seem to work.  When I ran
into
> this sort of thing with MSI 6800 it turned out the baud rate switch on the
> serial card wasn't correct, despite factory labelling.  That might be the
case
> here but not really sure how to sort it.
> 
> -----Original Message-----
> From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Paul
Birkel
> Sent: Thursday, August 4, 2016 12:29 PM
> To: 'General Discussion: On-Topic and Off-Topic Posts'
> <cctalk at classiccmp.org>
> Subject: RE: SWTPC 6800
>