ASCI u68 (SystemX)
unclefalter at yahoo.ca
Fri Oct 16 15:37:56 CDT 2015
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.
From: cctalk [mailto:cctalk-bounces at 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 at classiccmp.org>
Subject: Re: ASCI u68 (SystemX)
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
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