Porting Astéroric (a study clone of Asteroids for the Oric-1) to the Neo6502: arcade logic kept, XOR rendering through the firmware API, half-open lines, 16-bit coordinates, 30 Hz, HID keyboard, 4-channel sound, the cc65 OptStackOps case, bit-for-bit tests in Phosphoneo — then the tests on a real board. Read the article →
Forty phases to fit Asteroids into 20,000 cycles per frame: the budget that did not hold, XOR drawing and its vanishing vertices, the VSync that does not exist, flicker, the ROM we bypass, the BSS, sound borrowed from another machine, and what the emulator was hiding. Read the article →