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80EE: Drawing: Mask One Screen Byte
Used by the routine at DrawingSetup.
Masks one screen byte. It turns the row into a screen address and keeps the picture pointer.
Drawing_MaskOneScreenByte 80EE PUSH HL Call Drawing_ScreenAddressFromTheRow to turn the pen into a screen address.
80EF CALL Drawing_ScreenAddressFromTheRow
80F2 AND (HL) Apply the mask in A and restore HL from the stack.
80F3 POP HL
80F4 RET Return.
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