clear
power on
regs

op a0 55

# IY should now be set to 55
test iy = 55

op 88

# IY should now be set to 54
test iy = 54

# Wrap and negative case --------------
power on

op a0 00

# IY should now be set to 00
test iy = 0

op 88

# Should be: IY=FF, S=1
test iy = ff
test s = 1

# Zero case --------------------------
power on

op a0 01

# Should be: IY=01, Z=0
test iy = 1
test z = 0

op 88

# Should be: IY=00, Z=1
test iy = 0
test z = 1

save verify_88.txt