Udo Juerss minimized the original monitor written by Alois Nachtmann by removing the socalled “assembler”.
And added Intel Hex and MOS Technology papertape upload.. Furthermore some routines can be use in own programs like: TTY_INIT, TTY_PUTC, TTY_PUTS.
Here an archive with the source, binary and documentation.
See also:
Proton PIM-1
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Here his photos of...
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...
MACH-9 MMS Inc 6809 CPU Plug-in for AIM 65
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He sent me his design to be pu...