Apple II Graphics - Peculiarity of Graphics Modes

Peculiarity of Graphics Modes

The graphic modes of the Apple II series were peculiar even by the standards of the late 1970s and early 1980s. One notable peculiarity of these modes is a direct result of Apple founder Steve Wozniak's chip-saving design. Many home computer systems of the time (as well as today's PC-compatible machines) had architecture which assigned consecutive blocks of memory to non-consecutive rows on the screen in graphic modes, i.e., interleaving. Apple's text and graphics modes are based on two different interleave factors of 8:1 and 64:1.

A second peculiarity of Apple II graphics—the so-called "color fringes"—is yet another by-product of Wozniak's design. While these occur in all modes, they play a crucial role in Hi-Resolution or Hi-Res mode (see below).

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