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The known differences between the v0 and v1 ROMs are:
0x9f, 0xbf, 0xdf, 0xff
to port 0x7f
), for some reason this does not always work. v1 has a workaround for this bug: it moves the muting code into the IRQ handler, writing the bytes on every interrupt (once per frame?) while the game is paused.
rl c; rl c; rr c; rr c
, starting at address 0x27ee
.
0xc000-0xc084
in v0, 0xc000-0xc0c8
in v1).
It is unknown whether there are any other differences between the ROMs.
Researched by RetroSpark