tag

#vdp

3 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

Sega Master System VDP Sprites: Overflow Index, Collision Latch, and Status Reads

Model Master System VDP sprite selection as scanline state, including the eight-sprite limit, overflow index, pixel collision latch, and read-to-clear timing.

#master-system#vdp#sprites

RetrogamingDeep Dive October 3, 2026 8 min read

Mega Drive VDP DMA and FIFO: Bus Ownership, Queues, and Safe Transfers

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

#megadrive#genesis#vdp