Routines
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B272: Prepare a message in the message graphic buffer (1)
Used by the routine at AFE8. Clears the buffer at 5B00 in preparation for the message.
Input
DE Message address
B272 XOR A Clear the buffer at 5B00 in preparation for the message
B273 LD HL,$5B00
B276 LD (HL),A
B277 INC L
B278 JR NZ,$B276
B27A LD C,$FE Initialise the pixel column counter
B27C JP $B371
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