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#commodore-64

3 posts

RetrogamingDeep Dive October 4, 2026 8 min read

Commodore 64 SID Envelopes and Filters: Register Semantics Across Revisions

Model SID voice timing, ADSR state, filter routing, and chip-revision uncertainty with register-level traces and repeatable Commodore 64 tests.

#commodore-64#sid#6581

RetrogamingDeep Dive October 4, 2026 7 min read

Model C64 VIC-II bad-line conditions, video-matrix fetches, BA/AEC arbitration, and raster interrupts without assuming a constant CPU budget.

#commodore-64#vic-ii#raster

Tech HistoryDeep Dive October 3, 2026 8 min read

A technical history of the Commodore 64's 6510 CPU, VIC-II, SID, memory map, BASIC environment, manufacturing strategy, and broad software market.

#commodore-64#home-computers#6502