A 6803 based computer, modelled on the Tandy MC10
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The MC10 is based on the 6803 and the 6847. The 6803 is a 6800 with extra i/o and instructions. The MC10 firmware uses the extra instructions often. I used a 6811 assembler and made a file that assembles but I have not checked to output against a known-good file.
I'm currently more interested in my other 6803-based project, for which I have a board that I wish to get running.
To get started I'd just replace the keyboard and text routines with a USB-FIFO module, so people can run BASIC without needing a keyboard and 6847 and TV. But if people want to have games and graphics, a 6847 and real keyboard will be needed.
Could also use 6811 assemblers as is. Just don't use the op codes NOT in the 6803!
I used that for assembling 12k of disassembled 6803U4 automotive EFI code.
This one is mentioned in the Wikipedia entry:
http://www.aspisys.com/asm11.htm
so I used that to get a file that assembles.
The asxxx family of assemlblers supports 6803, according to the docs https://shop-pdp.net/ashtml/asxdoc.htm Can't vouch for this but I use the other members of the family.
Keith
zeeleez
Benjamin
EM
May be duplicate post ... didn't see my replay.
AS11M.exe. I seem to remember compiling it to eliminate automatic jmp -> bra substitution for close jumps.
many of these out there.
I actually debugged a 6803 uart bootloader for in application reflash using 6811 then assembled with selective areas around uart to run on 6803. Much easier as HC11 had serial bootstrap mode.
disassembler is now on sourceforge:
https://sourceforge.net/projects/m6811dis/
worked very well. code seeking - give it IRQ vectors and other indirect entry points and it follows code and leaves data alone.