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6

The HES MON 64 cartridge, by Terry Peterson, seems to have been available as early as 1982 (same year as the C64). This, according to the copyright notice on the manual. While it is referred to as a "ML Monitor", it really comprises all the basic utility software you'd need to create assembly language programs on a C64. HES MON 64 can be used to ...


5

I guess the answer is "all of the above, and more". I was just a kid with a C-64 in his bedroom at the time, but from my recollection: Cross compilers / assemblers existed; they were sometimes mentioned in magazine articles, usually involving a minicomputer, in the late 80s also a PC. However, this was rare and expensive, and limited to big ...


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