Everyone's A Wally: Routine at 81D4

81D4: Change direction

Used by the routines at B1A6, B288 and EFC7.

Input
IY	Current character pointer (BC67 - BC6B)

81D4

EXX

Exchange all registers.

81D5

XOR $01

Invert bit 1.

81D7

LD (IY-$3C),A

Set this for this character

81DA

LD E,(IY+$23)

Put the graphic ID in DE.

81DD

LD D,(IY+$28)

81E0

LD BC,$0400

Copy 0400 bytes (size of all frames). Control passes to 81E3.