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Rotated Page Half Indexing

IP.com Disclosure Number: IPCOM000052675D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Hanna, SD: AUTHOR

Abstract

Scan-type printers can be modified to print a rotated page. In one version of such a system, a rotated font is used which utilizes a character box (matrix) of 18 x 24 dots. The height of the character corresponds to an escapement of six, the escapement being a unit of measurement. The rotated page is printed with alternate lines blank when using half-indexing.

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Rotated Page Half Indexing

Scan-type printers can be modified to print a rotated page. In one version of such a system, a rotated font is used which utilizes a character box (matrix) of 18 x 24 dots. The height of the character corresponds to an escapement of six, the escapement being a unit of measurement. The rotated page is printed with alternate lines blank when using half-indexing.

To print a half-indexed rotated character, a blank character with an escapement of three is inserted in the character column of the half indexed character in the preceding blank line. After the escapement of three has been scanned, the character to be half-indexed is inserted. This character overlaps the next printed line and is followed by another blank character with an escapement of three. The next character in the column must be another blank with an escapement of three (if another half-indexed character is to be inserted) or six.

The printing of the half-indexed character, as described, requires the insertion of four characters -- a three-escapement blank, the half indexed character, another three-escapement blank, and a third blank in three lines of printing. This is shown in the figure.

Adding an extra bit to the escapement portion of the control word to increase the maximum escapement value from seven to fifteen alleviates the problem by permitting a blank with an escapement of nine to be inserted after the half- indexed character. This results in three characters in three...