Routines
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45682: Prepare a message in the message graphic buffer (1)
Used by the routine at 45032. Clears the buffer at 23296 in preparation for the message.
Input
DE Message address
45682 XOR A Clear the buffer at 23296 in preparation for the message
45683 LD HL,23296
45686 LD (HL),A
45687 INC L
45688 JR NZ,45686
45690 LD C,254 Initialise the pixel column counter
45692 JP 45937
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