Routines
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CB1E: Script Routine: (4F) Task-four entity action
Pick a new extra-state value for the task-four creature's next beat.
Input
IX Address of complex state data for an entity
ScriptRoutine_TaskFourRandomiseExtra CB1E LD (IX+$0C),$04 Write 04 to the current entity's extra state.
CB22 LD A,$05 Load A with 05.
CB24 CALL PseudoRandom Call PseudoRandom to pick a pseudo-random value.
CB27 ADD A,$06 Add 06 to A (adjust a task-four index/counter).
CB29 LD C,A Keep the index in C.
CB2A LD A,$02 Load A with 02.
CB2C CALL PseudoRandom Call PseudoRandom to pick a pseudo-random value.
CB2F OR A Is A zero? If so, jump to ScriptRoutine_TaskFourRandomiseExtra_StoreDeltaClearBit4.
CB30 JR Z,ScriptRoutine_TaskFourRandomiseExtra_StoreDeltaClearBit4
CB32 LD A,C Copy the saved count/flag from C into A.
CB33 NEG Negate A (flip a delta/direction).
CB35 LD C,A Keep the delta in C.
Keep the signed step delta, drop the upstairs latch on GameEventFlags, and continue the script.
ScriptRoutine_TaskFourRandomiseExtra_StoreDeltaClearBit4 CB36 LD (IX+$09),C Store C in the current entity's direction / state.
CB39 LD A,($72B3) Load A with the game event flags (GameEventFlags).
CB3C RES 4,A Clear bit 04 of the flag byte in A.
CB3E LD ($72B3),A Set the game event flags (GameEventFlags).
CB41 JP AdvanceScriptInstruction Jump to AdvanceScriptInstruction to run the next script instruction.
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