Bill Budge Preshift

Bill Budge's preshift routine for Apple 2

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Last Update: 2026-03-27

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Code from article in Dec 1984 Byte magazine outlining Bill Budge's preshift routine for drawing Apple 2 bitmaps shifted horizontally.
Article here:
https://mirrors.apple2.org.za/ftp.apple.asimov.net/documentation/programming/6502assembly/Preshift.pdf

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