tag

#joypad

3 posts

RetrogamingDeep Dive October 4, 2026 7 min read

SNES Auto-Joypad Read: VBlank Sampling, Result Words, and Manual Reads

Understand SNES auto-joypad enable and busy flags, four result words, bit ordering, VBlank sampling, and when software must switch to manual polling.

#snes#controller#vblank

RetrogamingDeep Dive October 3, 2026 8 min read

Game Boy JOYP Input: Active-Low Matrix Scanning and Interrupt Edges

Read Game Boy buttons correctly through FF00 by scanning its active-low matrix, handling selection-induced edges, debouncing input, and testing joypad interrupts.

#game-boy#joypad#input

RetrogamingDeep Dive October 3, 2026 9 min read

Super Game Boy Command Protocol: Packets, Timing, and Multiplayer Input

Implement Super Game Boy commands with correct JOYP pulse encoding, packet framing, transfer delays, multiplayer requests, and emulator validation.

#game-boy#super-game-boy#joypad