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upd77c25

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gufranco / snes-dsp-python

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The NEC uPD77C25 as Nintendo shipped it across four microcodes. The DSP-2 is modelled with its commands proved rather than sampled: the tile conversion exhaustively over all 256 bits, the merge over every input it accepts, and the whole chip differentially against a reference validated on 71,970,987 recorded bytes.

emulator nintendo graphics emulation reverse-engineering snes bit-manipulation retrocomputing coprocessor super-famicom super-nintendo hardware-emulation dungeon-master property-testing retro-gaming conformance-testing dsp2 exhaustive-testing upd77c25 nec-upd77c25
  • Updated Aug 21, 2026
  • Python

gufranco / nec-upd7725-96050-python

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NEC uPD7725 and uPD96050 DSP emulator in Python, cycle accurate. Held to NEC's data book for every flag each ALU operation touches and to a per-encoding corpus for the whole processor state: 1,002,240 instructions compared, zero disagreements. 100% branch coverage, no firmware ever

emulator simulator dsp processor emulation retrocomputing coprocessor cycle-accurate hardware-emulation instruction-set-simulator cpu-emulator nec hardware-model conformance-testing digital-signal-processor upd77c25 upd7725 upd96050 nec-upd7725 dsp-emulator
  • Updated Aug 25, 2026
  • Python

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