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| layout | title | permalink |
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| page | Challenger 1P Programming Guides/Samples | /pubs/c1p/programming/ |
Challenger 1P Programming Guides/Samples
6502 ASSEMBLER/DISASSEMBLER
This "source code listing" from June 19, 1980 is for the first piece of software I sold, right around the time I graduated from high school. I had had my Ohio Scientific Challenger 1P for maybe a year when I decided to write something that would make it easier to write "machine language" programs than the incredibly tedious HEX monitor that was built into the C1P. And so my 6502 ASSEMBLER/DISASSEMBLER was born, with full-screen editor, assembler, and disassembler.
One of the conditions of the sale, however, was that I provide a "source code" listing. I don't think the buyer understood that I had essentially written the program in machine language -- because that's how I had to enter it into the machine. Maybe some lucky C1P users had disk drives and editors and assemblers, but I had none of those of things. I had never even used tools like that before, which is why the 6502 ASSEMBLER/DISASSEMBLER is a bit of an odd duck. I'll post some screenshots and a demo eventually, and you'll see what I mean.
Anyway, to satisfy the buyer, I sat down at my old manual typewriter and banged out my version of a "source code" listing. I produced it mostly by using the program to disassemble itself, combined with information from hand-written notes (which I may still have somewhere). Here it is, many decades later, for your amusement.
