A PDF file containing the listing of MIKBUG 2.0 can be found in a few places on the internet. There does not appear to be a source file available.

In a moment of stupidity or bravery I suggested to the MOTOROLA 6809 / 6309, 6800 ASSEMBLY LANGUAGE PROGRAMMING group on Facebook that we could share the work in converting this PDF into a source file so we could run it again.

The source compiles (albeit with one syntactical change) using as0. The change is replacing uses of X when used as an indirection pointer with 0,X.

• mikbug20.pdf is the original file.
• mikbug20srconly.pdf is the original file with only the listing of the code.
• pages/* are the transcriptions of the individual pages
• mikbug2.asm is the combined output of the transcription effort
• mikbug2.lst is the output listing from the assembler

Note for transcribers:

• Comment lines start with an asterisk - *
• Labels start in column 1
• Opcodes start in column 8
• Operands start in column 15
• In-line comments usually start in column 24

e.g.

000000000111111111122222222223333333333
123456789012345678901234567890123456789
|------|------|--------|---------------
SWI    EQU    $3F      SWI OP CODE