5 Aug
2016
5 Aug
'16
9:56 a.m.
RAM could certainly be an issue. I had *tons* of bad RAM dogging me with my Digital Group
Z80. That took two weeks of testing to get through it. I might just test out all this
RAM in the DRC boards first and see if I can get away with just using those rather than
bringing the soldered MP-M boards into the mix right now.
-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Dave Wade
Sent: Friday, August 5, 2016 2:42 AM
To: 'General Discussion: On-Topic and Off-Topic Posts' <cctalk at
classiccmp.org>
Subject: RE: SWTPC 6800
-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Brad
H
Sent: 05 August 2016 07:46
To: General Discussion: On-Topic and Off-Topic Posts
<cctalk at classiccmp.org>
Subject: RE: SWTPC 6800
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.
If the data received is inconstant then bad RAM is a likely cause, ROM usually fails
consistanly.
but as with all problem solving, Conan Doyle had it right when he said "after
eliminating the impossible, whatever is left, however improbable, must be the
solution"
Dave
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