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Debugging the Neo6502 over SWD: a Pico W flashed with debugprobe, three wires (GP2, GP3, GND), OpenOCD, reading the running RP2040's memory, injected keystrokes, the core 0 rule — with photos of the bench. Read the article →
On the Neo6502, the first DIR command in Hercules mode switched the screen off. Twelve fixes, eleven refuted by measurement, four miscalibrated instruments — and at the end, an SDK spinlock shared between the two cores, delaying the video interrupt by a single scanline. Read the article →