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#sega-master-system

2 posts

RetrogamingDeep Dive October 4, 2026 7 min read

Sega Master System Line Interrupts: VDP Counter Reloads and Raster Timing

Implement Master System horizontal interrupts by separating the VDP line counter, active-display reload rules, frame IRQ, status acknowledgement, and model timing.

#sega-master-system#vdp#interrupts

RetrogamingDeep Dive October 4, 2026 8 min read

Master System YM2413 FM Unit: Detection, Port Control, and Voice Modes

Explain the Mark III and Japanese Master System YM2413 path, from F2 control and hardware detection to OPLL instruments and rhythm-mode testing.

#sega-master-system#ym2413#fm-synthesis