Flunky: Routine at 9AB9

9AB9: Graphic layout routine: (246) Decrease timer value, and if zero, reset and write random attribute from list into next instruction

Input
IX	Address of first parameter in current graphic layout data instruction

Output
B	Do-not-recalculate-display-buffer-address flag (00)
IX	Address of next graphic layout data instruction to process

9AB9

LD B,$00

Prepare to recalculate display buffer address.

9ABB

DEC (IX+$00)

Decrease timer value.

9ABE

JR Z,$9AC6

If timer is zero, then reset timer, advance to next instruction and set that instruction's attribute to random value from sequence.

This entry point is used by the routine at 9AA9.

9AC0

CALL $9AE7

Advance to next instruction and process.

9AC3

JP $989E

9AC6

CALL $9ACF

Reset timer to maximum, advance IX to start of next instruction and set second value here (attribute) to random value from sequence of data following previous instruction.

9AC9

LD (IX+$01),E

9ACC

JP $989E

Read / process data at address in IX.