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2 posts

RetrogamingDeep Dive October 4, 2026 8 min read

Famicom Disk System Transfers: Byte Service, CRC, and IRQ State

Model FDS transfers as controller-driven byte events, separating timer IRQs, data service, motor state, CRC, BIOS sequencing, and uncertain acknowledgements.

#famicom#fds#disk-system

RetrogamingDeep Dive October 4, 2026 8 min read

NES Controller Serial Strobe: Latching, Port Reads, and Open-Bus Bits

Implement NES controller reads as a shared strobe and two timed serial ports, preserving button order, open-bus lines, device variants, and DMA edge cases.

#nes#famicom#controller