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7211: Reset Screen Buffer
Used by the routine at ResetAttributes.
Clears the display file by filling it with 00. The screen attributes are left as they were.
ResetScreen 7211 LD HL,$4000 HL=4000 (screen buffer).
7214 LD B,$58 B=58 (i.e. finish once we reach the start of the attribute buffer).
7216 LD C,$00 C=00 (value to write).
Continue on to ResetCopier to blank the screen buffer.
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