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michaelcmartin / Ophis

A cross-assembler for the 6502 series of microprocessors.
http://michaelcmartin.github.io/Ophis/
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Future 65816 support (Apple IIgs, SNES) #18

Closed Hamtaro126 closed 9 months ago

Hamtaro126 commented 11 years ago

Hello, I've wondered if someone can add 65816 (16-bit) support in the future as it has great stuff!

Otherwise, Seems Complete!

michaelcmartin commented 9 months ago

Having finally gotten around to learning enough 65816 to see how it is used in the Apple IIgs and SNES, I don't think it's actually a good fit for Ophis. Most traditional syntaxes use symbols (^, []) that conflict with Ophis's own use of them, and these would vastly complicate the parser to the point that it would effectively be a new application.

Added to this, the IIgs needs special linking work to produce its final binaries, and Ophis's memory model is a poor fit for this.

For future readers who come to this ticket looking to do 65816 development, "Merlin 32" is an excellent tool for creating fully-fledged Apple IIgs applications and either "WLA-DX" or the "ca65" and "ld65" tools from the cc65 suite for SNES work.