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Added SetRNGIndex event command (opcode: A4) #126

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Added SetRNGIndex event command (opcode: A4) #126

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18 changes: 18 additions & 0 deletions instruction/field/custom.py
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Original file line number Diff line number Diff line change
Expand Up @@ -402,3 +402,21 @@ def __init__(self, function_address, arg = 0):
LongCall.__init__ = (lambda self, function_address, arg = 0 :
super().__init__(opcode, function_address.to_bytes(3, "little"), arg))
self.__init__(function_address, arg)


class SetRNGIndex(_Instruction):
def __init__(self, value):
src = [
asm.LDA(0xeb, asm.DIR),
asm.STA(0x1f6d, asm.ABS), # 0x1f6d is the current index to the RNG table
asm.LDA(0x02, asm.IMM8), # Command size
asm.JMP(0x9b5c, asm.ABS) # Jump to next command
]

space = Write(Bank.C0, src, 'set RNG index')
address = space.start_address
opcode = 0xa4
_set_opcode_address(opcode, address)

SetRNGIndex.__init__ = lambda self, value: super().__init__(opcode, value)
self.__init__(value)