Routines
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31647: XOR pixel
XORs the screen pixel at x,y
This is the entry in the jump table handled by the routine at 32374 when that code is called with A=2
Input
B ypos
C xpos
pixel_xor 31647 CALL pxy2saddr pxy2saddr of B=ypos, C=xpos
31650 XOR (HL) Toggle screen bit
31651 LD (HL),A XOR in the required pixel
31652 RET
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