ASCI u68 (SystemX)

[Henk Gooijen]

-----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?

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>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