It was only about the size of THAT screen. But it doesn't - it can't - there are NO inches and NO dpi in ANY video system - our screens are dimensioned in pixels. However it was unfortunately also detrimental to our understanding how things work, because it let us assume 72 dpi had some significance to the video system. But that one early screen was always the same size then, and this advertising was very effective for Apple back then.
It is not possible now because modern screens vary in size. 10-Point fonts could be represented to be 10 pixels tall, to be 10/72 inch on the screen, even if they weren't. A printer's Point (on the printed page) was 1/72 inch, so this first Logical Inch declares that 72 pixels is an inch, without regard for which screen size (which was Not true on other screen sizes, but it was simplification). The size accuracy was not because of the number 72 dpi per se, it was because this logical inch size was selected to match this ONE physical Mac screen size. MS-DOS screens did not show graphic text, and instead used screens dimensioned as 80x25 fixed-width characters of one bit-mapped font.Īnd back then, Apple did brag about 72 dpi and about WYSIWYG (What You See Is What You Get), meaning text on that screen looked the same, and matched the size of the same text printed on paper. We take this for granted today, but graphic text on the video screen was a new idea then. That 1984 Macintosh graphical system was something new, it could show various font faces and sizes, italics and bold, even proportional fonts on the screen for the first time. Apple still uses that number today for text logical inches, but that number was only about the size of THAT screen. Apple's 72 dpi logical inch was close to accurate text size on the early Macintosh screen (1984), which is why Apple selected the 72 dpi number back then.
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