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? --------- 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