Commodore's Assemblers: Part 1: MOS Cross-Assembler – pagetable.com
Part 4: HCD65 [coming soon] Part 5: Commodore 6502 ASM [coming soon] History Cross-Assembler”, available for various mainframes and minicomputers, and the “ Resident Assembler”, running on natively on 6502 systems. According to the master’s thesis A Cross-Assembler/Simulator for a Microprocessor-Based Industrial Controller, the original MOS Cross-Assembler, together with a simulator, was implemented by the student Robert E. Blanton at the University of Illinois at Urbana-Champaign. It was written in FORTRAN and used a 6-bit (i.e. all uppercase) character encoding. On the university...
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