6502 is nice to program in assembler. For a compiler it is an atrocious platform to support. The limited stack, the 8 bit limit, the zero page idiosyncrasies, t

6502 is nice to program in assembler. For a compiler it is an atrocious platform to support. The limited stack, the 8 bit limit, the zero page idiosyncrasies, the page crossing bugs (some corrected in 65C02), etc. Z80, while also full of adhoc-isms is a much more pleasant target for a C compiler, only just for its 16 bit register and stack.