Application programs may display a different page width on different Macintosh monitors. For example, a Macintosh Classic can display a Microsoft Works document up to 6.5 inches. A Macintosh LC with a 12-inch RGB monitor displays up to 6.5 inches.

This is because the page width on a Macintosh monitor is determined by the number of pixels available, not by the physical screen size. The Macintosh Classic (and other compact Macintosh 9-inch screens) and the 12-inch RGB monitor are 512 pixels wide. They display the same ruler length.

The 9-inch monitor is 342 pixels tall, while the 12-inch RGB monitor is 384 pixels tall. The 13-inch RGB monitor and the 12-inch monochrome monitor are 640 pixels wide and 480 pixels tall.

Here is a table of some monitors and the pixels per inch available:

Monitor	Pixels Per Inch
9-inch	72
12-inch RGB	64
12-inch monochrome	76
13-inch RGB	69
Performa Display	67
Performa Plus Display	67
14-inch Color	69
AudioVision 14	69
Performa 575	69
Multiple Scan 15, 17, 20	64-79
16-Inch Color	70
Portrait Display	80
Multiple Scan 20 1152x870	79
21-inch clolor	79
Two-Page monochrome	77

Text Pixels Per Inch Chart

QuickDraw is based on 72 pixels per inch. Unless the application takes into consideration the monitor used, the displayed measurements on the screen use 72 pixels per inch. When the application considers the pixels available, the measured size of the displayed ruler varies according to the monitor.

Since all Apple printing devices take into consideration the 72 pixels per inch of QuickDraw, they provide correct measurements shown on the screen-displayed ruler.

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