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Jeff Parsons 2016-05-06 09:06:15 -07:00
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@ -9,7 +9,7 @@ Challenger 1P Programming Guides/Samples
### 6502 ASSEMBLER/DISASSEMBLER ### 6502 ASSEMBLER/DISASSEMBLER
This "source code listing" from June 19, 1980 represents the first piece of software I sold, right around the 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 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 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 HEX monitor that was built into the C1P. And so my **6502 ASSEMBLER/DISASSEMBLER** was born, with full-screen
@ -17,12 +17,12 @@ 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 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 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 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 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. 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 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 using the program to disassemble itself, combined with information 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. from hand-written notes (which I may still have somewhere). Here it is, many decades later, for your amusement.
[<img src="http://archive.pcjs.org/pubs/c1p/programming/thumbs/OSI_Assembler-Disassembler_Listing-thumb.jpg" width="200" height="260" alt="6502 Disassembler Listing (by Jeff Parsons, June 1980)"/>](http://archive.pcjs.org/pubs/c1p/programming/pdfs/OSI_Assembler-Disassembler_Listing.pdf) [<img src="http://archive.pcjs.org/pubs/c1p/programming/thumbs/OSI_Assembler-Disassembler_Listing-thumb.jpg" width="200" height="260" alt="6502 Disassembler Listing (by Jeff Parsons, June 1980)"/>](http://archive.pcjs.org/pubs/c1p/programming/pdfs/OSI_Assembler-Disassembler_Listing.pdf)