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#megadrive

2 posts

RetrogamingDeep Dive October 4, 2026 7 min read

Sega Genesis YM2612 Channel 3 Special Mode: Four Frequencies, One FM Channel

Decode YM2612 register 27h special mode, map channel 3 operator frequencies, preserve timer controls, and test key-on and frequency-latch behavior.

#sega-genesis#megadrive#ym2612

RetrogamingDeep Dive October 3, 2026 8 min read

A hardware-grounded guide to Mega Drive VDP DMA modes, 68000 bus stalls, FIFO status, display-time limits, and emulator validation.

#megadrive#genesis#vdp