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FC57: Hide the play area
Used by the routines at 7866 and FB52. Hides the play area and clears the screen refresh buffer (SRB).
FC57 LD HL,$5A7F Set the attribute bytes for the top 20 rows of the screen to 9 (INK 1: PAPER 1)
FC5A LD (HL),$09
FC5C DEC HL
FC5D BIT 3,H
FC5F JR NZ,$FC5A
FC61 LD HL,$7F5F Set every byte in the SRB to 0
FC64 LD (HL),$00
FC66 DEC L
FC67 JR NZ,$FC64
FC69 RET
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