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80B4: Reset Screen Buffer
Used by the routine at ClearScreen.
Points at the start of the screen buffer and fills it with 00.
ResetScreen 80B4 LD HL,$4000 HL=4000 (the start of the screen buffer).
80B7 LD B,$58 B=58 (i.e. finish once we reach the start of the attribute buffer at 5800).
This entry point is used by the routine at ResetPlayerData.
ResetScreen_Fill 80B9 LD C,$00 Set the value to write in C to 00.
Continue on to ResetCopier to blank the screen buffer.
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