CSA-101 §11.10 · Cached references
Offline-cached copies of the external 6502 references the curriculum cites, mirrored locally so they keep working when the source URL goes dark. Surfaced from the workbench tools under §11.10.
Canonical 56-instruction lookup table: opcodes, addressing modes, and cycle counts.
Tutorial walkthrough of the 6502's addressing modes with byte-level examples.
Browser-friendly intro to 6502 assembly with an in-page emulator; same instruction subset as SPK-101 wk-3.
In-browser transistor-level 6502 simulator; the canonical "look inside the silicon" surface.
Primary-source memoir: the 1976 decision that put the 6502 in the Apple ][ and shaped retro computing.