Often you have to press RETURN or SPACE a few
times to wake up the serial connection and set the
baud rate; if you put a scope on the RX and TX
lines, do you see the incoming signal from the
terminal and does anything get sent back?
Can you trace the RX and TX signals to see what
chips are used to convert RS-232 to TTL?
m
----- Original Message -----
From: "Brad" <unclefal...@yahoo.ca>
To: "'General Discussion: On-Topic and Off-Topic
Posts'" <cctalk@classiccmp.org>
Sent: Friday, October 16, 2015 4:37 PM
Subject: RE: ASCI u68 (SystemX)
Thanks Henk,
I tried that. No prompt comes up with PUTTY on
serial set at any baud rate. Instead on the LED
display I get a C, or an S sometimes.
-----Original Message-----
From: cctalk
[mailto:cctalk-boun...@classiccmp.org] On Behalf
Of Henk Gooijen
Sent: Friday, October 16, 2015 11:56 AM
To: General Discussion: On-Topic and Off-Topic
Posts <cctalk@classiccmp.org>
Subject: Re: ASCI u68 (SystemX)
-----Oorspronkelijk bericht-----
From: Brad
Sent: Friday, October 16, 2015 8:27 PM
To: 'General Discussion: On-Topic and Off-Topic
Posts'
Subject: RE: ASCI u68 (SystemX)
Many thanks. I'll take a quick look online just
to see if I can save you the trouble. I'm
surprised at how little documentation there is for
this thing.
As a general rule, does anyone know -- if you have
a single board computer like this with serial
connector, is that 'live' all the time? Or do you
usually have to invoke a program in order for a
terminal to connect to it and use it?
---------
From all the SBCs that I know, the standard serial
port is always active. The on-board monitor with
very basic commands uses it as only means of
communication.
After reset the monitor will "print" possible a
one-line identification and on the next line some
form of prompt.
Could be * or . or > or - or whatever.
You need to know the com ports settings, but it
prints an ID line you can try several baudrates.
9600 is a good start.
If you want 6800 info, ask. I can dream 6800
opcodes!
INX=$08, LDA # =$86, DEX=$09, STAindexed =$A6.
etc.
Depending on the RAM size, I have a StarTrek
version in 6800 assembler that uses a serial port
... IIRC, it is some 1.5k
- Henk
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