From Newsgroup: comp.os.cpm

Hi,

at https://github.com/z80playground/sargon-cpm a slightly modified
version of the original CP/M-80 Sargon chess program from 1978 can be downloaded. I tried this one, and it looks great with Codepage 437 and
ANSI terminal emulation on a PC, but looks very ugly on a SC126 (RC2014 compatible Z180 SBC) with RP2040 VGA Terminal, which has also some sort
of ANSI/VT100 emulation. The codepage 437 graphics chars are NOT the
problem (because RP2040 VGA Terminal supports this), but the ESC
sequences for color. I tried to modify the binary at the address of the
ESC sequence stored in the file, but the program crashes immediately
(thought the ESC sequences are null-terminated strings, but it seems
they are not). The source code seems to be assembled with "PASMO", but I
don't know PASMO. The unmodified original source code (?) can be found
at https://github.com/billforsternz/retro-sargon/blob/master/stages/sargon-z80.asm
... does anybody tried to adapt/modify the Sargon78 to run with
non-color VT100/ANSI codes but keep the CP437 graphics chars ?

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From Newsgroup: comp.os.cpm

Peter Dassow <z80eu@arcor.de> writes:

Hi,

at https://github.com/z80playground/sargon-cpm a slightly modified
version of the original CP/M-80 Sargon chess program from 1978 can be downloaded. I tried this one, and it looks great with Codepage 437 and
ANSI terminal emulation on a PC, but looks very ugly on a SC126 (RC2014 compatible Z180 SBC) with RP2040 VGA Terminal, which has also some sort
of ANSI/VT100 emulation. The codepage 437 graphics chars are NOT the
problem (because RP2040 VGA Terminal supports this), but the ESC
sequences for color. I tried to modify the binary at the address of the
ESC sequence stored in the file, but the program crashes immediately (thought the ESC sequences are null-terminated strings, but it seems
they are not). The source code seems to be assembled with "PASMO", but I don't know PASMO. The unmodified original source code (?) can be found
at https://github.com/billforsternz/retro-sargon/blob/master/stages/sargon-z80.asm
.... does anybody tried to adapt/modify the Sargon78 to run with
non-color VT100/ANSI codes but keep the CP437 graphics chars ?

I had a heavily-modified Sargon working under North Star DOS way back in the 80s. Instead of working with screen graphics, I was using a teletype so my Sargon reprinted a new diagram of the chessboard after each move.

At some point I tried to convert that to CP/M assembled with MAC. I can't remember whether or not I had it working under CP/M.

I dug up that CP/M code and it assembles cleanly. But when I try to run it using xterm, there is a fault, in that there seems to be an infinite text
input or output loop. (I didn't spend time with the debugger to determine which - I suspect it's an output loop.)

I can email the (faulty?) code to your email if you like, but you will
probably be better off playing with the original Sargon code like I did back
in the 80s.

Regards,

Jack
--
90% of people who are bald still own a comb.
They just can't part with it.
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