Browse Prior Art Database

Character Position Control Apparatus

IP.com Disclosure Number: IPCOM000053185D
Original Publication Date: 1981-Sep-01
Included in the Prior Art Database: 2005-Feb-12
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Findley, GI: AUTHOR [+2]

Abstract

For an all-points-addressable raster printer, the X and Y positional information for different characters is utilized according to ascending (or descending) order of X(or Y) so that the characters which start in any predetermined group of scan lines can be linked together into a group scan table.

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Character Position Control Apparatus

For an all-points-addressable raster printer, the X and Y positional information for different characters is utilized according to ascending (or descending) order of X(or Y) so that the characters which start in any predetermined group of scan lines can be linked together into a group scan table.

The predetermined group (called subscan) of scan lines is chosen so that conveniently sized blocks of writable storage can be allocated and controlled to store the character data for an entire page. A Group Scan Table is prepared whereby only one entry is required in the table for each group of consecutive scans. The subscan information in the Group Scan Table is stored along with the character size information in the Pattern Address Table. This information carries the scan offset value within the group of scans. The subscan information is extracted from the Pattern Address Table and logically ORed into the Group Scan to properly offset the character into its exact location by the character generator at print time.

An example is used to better illustrate the use of this invention in which a printed page with `ALONG THE SCAN EXAMPLE', as shown in Fig. 2, is transformed into entries in the Group Scan Table and Pattern Address Table, as shown in Fig. 1. The entry PAL in the Pattern Address Table includes the information on character size, starting pel (picture element) and the pattern address of the character. The subscan two bits are al...