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62733: Keep Only The Bits That Are Set
Used by the routine at DrawingFill.
Reads the screen byte under the pen and keeps only the bits already set there.
KeepOnlyBitsThatAreSet 62733 PUSH HL Call PixelAddress to work out the pixel address.
62734 CALL PixelAddress
62737 AND (HL) Keep only the screen bits already set under the pen.
62738 POP HL Restore the saved pointer from the stack.
62739 RET Return.
View the equivalent code in;
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