Differences by Emulator

psst:
http://www.romhacking.net/forum/index.ph...#msg410463
(read the next few posts.)

Code:

C3/F0D0:  8D 03 42      STA $4203       (multiply by 12)
C3/F0D2:  EA            NOP
C3/F0D4:  EA            NOP
C3/F0D6:  AD 16 42      LDA $4216       (result of multiplication)

because your instructions' addresses don't match up with their sizes, instead just being 2 bytes apart, i can't tell whether you indeed have a mere 2 NOPs here, or more.  go for 4, though 3 will probably technically be safe.