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64599: Hide the play area
Used by the routines at 30822 and 64338. Hides the play area and clears the screen refresh buffer (SRB).
64599 LD HL,23167 Set the attribute bytes for the top 20 rows of the screen to 9 (INK 1: PAPER 1)
64602 LD (HL),9
64604 DEC HL
64605 BIT 3,H
64607 JR NZ,64602
64609 LD HL,32607 Set every byte in the SRB to 0
64612 LD (HL),0
64614 DEC L
64615 JR NZ,64612
64617 RET
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