collapseos/blk/305
Virgil Dupras e4a4a9800d z80: Use BC as IP register instead of IY
It's a bit more inconvenient in terms of register protection (BC
is much more generally useful than IY), but it makes tight spots
such as next and execute much faster, so I think it's worth it.
2020-07-06 23:31:00 -04:00

12 lines
175 B
Plaintext

CODE EXECUTE
DE POP,
chkPS,
lblexec @ JP,
CODE EXIT
PC ORG @ 0x0d + ! ( stable ABI JP )
C 0 IX+ LDrIXY,
B 1 IX+ LDrIXY,
IX DECd, IX DECd,
JPNEXT,