Routines
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54123: Subtract From Bounty
Used by the routines at ReloadRevolver and TakeFromBounty.
Subtracts an amount from Bounty, as AddToBounty adds to it.
Input
BC The amount, as four packed decimal digits
Output
F The carry flag is set if the amount is more than the bounty
Subtract the lowest two digits.
SubtractFromBounty 54123 LD HL,41561 Point HL at Bounty_LastByte.
54126 LD A,(HL) Subtract the lower two digits.
54127 SUB C
54128 DAA Make it decimal.
54129 LD (HL),A Store the lowest two digits of Bounty.
54130 DEC HL Move on to the next byte.
Subtract the middle two digits.
54131 LD A,(HL) Subtract the next two digits and the carry.
54132 SBC A,B
54133 DAA Make it decimal.
54134 LD (HL),A Store the middle two digits of Bounty.
54135 DEC HL Move on to the next byte.
Subtract the highest two digits.
54136 LD A,(HL) Subtract the carry.
54137 SBC A,0
54139 DAA Make it decimal.
54140 LD (HL),A Store the highest two digits of Bounty.
54141 RET Return.
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