Routines
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D1DC: Calculate Handler Offset
Used by the routine at ProcessObjectDisplayLogic.
Adds 0F to the record's flag byte and steps IX on by that many bytes.
CalculateHandlerOffset D1DC PUSH DE Read the record's flag byte and add 0F to the total.
D1DD LD D,A
D1DE LD A,(IX+$00)
D1E1 ADD A,$0F
D1E3 LD E,A
D1E4 LD A,D Step to the next record.
D1E5 LD D,$00
D1E7 ADD IX,DE
D1E9 POP DE
CalculateHandlerOffset_Loop D1EA CP (IX+$00) Jump ahead to CalculateHandlerOffset_Next if this id matches the record's flag byte.
D1ED JR Z,CalculateHandlerOffset_Next
D1EF INC (IX+$00) Jump to CalculateHandlerOffset_TestSignalStepFailed if this byte was the FF end marker.
D1F2 JR Z,CalculateHandlerOffset_TestSignalStepFailed
D1F4 DEC (IX+$00) Go to CalculateHandlerOffset_0 if stepping this byte down leaves zero.
D1F7 JR Z,CalculateHandlerOffset_0
D1F9 INC IX Skip this handler and try the next one.
D1FB INC IX
D1FD JR CalculateHandlerOffset_Loop
The condition holds, so the caller continues.
CalculateHandlerOffset_Next D1FF SCF Mark the condition as met.
D200 RET Return.
CalculateHandlerOffset_TestSignalStepFailed D201 DEC (IX+$00) Restore the end marker.
CalculateHandlerOffset_0 D204 XOR A Clear A.
D205 RET Return.
View the equivalent code in;
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