is a Nintendo Entertainment System emulator for the Nintendo 64, written
in MIPS R4000 assembly by Halley's Comet Software and assembled with U64ASM,
our own R4000 assembler. It can be run on the N64 by using a backup
device, such as a v64jr. It is also the first program of any kind that can be
run on the N64 with a Gameshark Pro.
As of 2019-05-21, the latest version I'd recommend is Visor's Neon64 With Savestates 0.3b or 0.3c (see this thread for archival purposes).
Neon64 development log
Some comments about Neon64
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