Routines
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B9FB: Guard Heading North
Keeps a guard heading north, at a speed of 02, until it hits something. It then turns east.
Input
IX Address of the guard
Output
H Speed in Y
L Speed in X
GuardHeadingNorth B9FB LD HL,$0200 Set the speed in X to 00 and the speed in Y to 02.
B9FE BIT 1,(IX+$0C) Test whether the guard has hit something along the Y axis.
BA02 RET Z Return if it has not.
BA03 LD HL,$0002 Set the speed in X to 02 and the speed in Y to 00.
BA06 JR TurnGuard Jump to TurnGuard to turn the guard.
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