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7439: Reset Screen Buffer
Used by the routine at CreateWindow.
Clears the screen buffer to zero, but leaves the attribute buffer alone.
ResetScreen 7439 LD HL,$4000 HL=4000 (the start of the screen buffer).
743C LD B,$58 B=58 (i.e. finish once we reach the start of the attribute buffer at 5800).
743E LD C,$00 C=00 (value to write).
Continue on to ResetCopier to blank the screen buffer.
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