Gunfright: Routine at C910

C910: Handle Mounted Sheriff

Type 15: the sheriff on a horse. On every fourth frame it counts RidingTimer down. When that reaches zero, TopSpeed is set to 0A the speed to 08 and the type to 01.

Input
IX	The address of the sheriff

Jump to HandleSheriff unless it is time to count down.

HandleMountedSheriff

C910

LD A,($A216)

Fetch FrameCounter.

C913

ADD A,$02

Add 02.

C915

AND %00000011

Keep the lowest two bits.

C917

JR NZ,HandleSheriff

Jump to HandleSheriff if this is not every fourth frame.

Count down RidingTimer.

C919

LD HL,$A209

Point HL at RidingTimer.

C91C

LD A,(HL)

Jump to HandleSheriff if RidingTimer is zero.

C91D

AND A

C91E

JR Z,HandleSheriff

C920

DEC (HL)

Count RidingTimer down.

C921

JR NZ,HandleSheriff

Jump to HandleSheriff if it is not zero.

Get off the horse.

C923

LD A,$0A

Set TopSpeed to 0A.

C925

LD ($A21F),A

C928

LD (IX+$05),$08

Set the speed to 08.

C92C

LD (IX+$00),$01

Make the type 01.

Continue on to HandleSheriff.