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SkillsMP has collected 5 skills from sunsided/6502-skills. Open a skill to review its source and details.
Showing 5 of 5 collected skills.
How to read and write 6502/65C02/65816 assembly source for the Merlin macro assembler (Merlin 8, Merlin Pro, Merlin 16/16+, Merlin 32 on Apple II/IIgs, and Merlin 64/128 on Commodore). Covers Merlin's source column layout, its pseudo-opcodes/directives (ORG,…
Reference and semantics for the MOS 6502 / 65C02 / 65816 instruction set: mnemonics, addressing modes, opcode bytes, cycle counts, and exact flag effects. Use this skill WHENEVER you read, write, disassemble, trace, explain, or port 6502-family assembly…
Memory maps, I/O register layouts, ROM entry points, and zero-page conventions for the main 6502 home computers: the Apple II family, the Commodore 64, and the Atari 400/800/XL/XE. Covers Apple II soft switches ($C000-$C0FF), language card, Monitor ROM and…
Reference for SWEET16, Steve Wozniak's 16-bit interpreted pseudo-processor built into the Apple II Integer BASIC ROM (entry $F689). SWEET16 is a tiny virtual machine with sixteen 16-bit registers (R0-R15) living in zero page, invoked by JSR SWEET16 followed…
A workflow for porting 6502/65C02/65816 assembly (Apple II, Commodore 64, Atari 8-bit, NES, Merlin source, SWEET16) to modern Rust by first lifting it to an explicit intermediate language (IL) and then raising that IL to idiomatic Rust. Covers the two-stage…