Browse Prior Art Database

Universal A/N Panel Sequence

IP.com Disclosure Number: IPCOM000078509D
Original Publication Date: 1973-Jan-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 3 page(s) / 65K

Publishing Venue

IBM

Related People

Criscimagna, TN: AUTHOR [+2]

Abstract

In a gas panel display designed for alphanumeric use in a conventional typewriter mode, a universal control sequence using the control architecture illustrated in the accompanying flow diagram is both flexible and inexpensive. The architecture is designated universal in that it will perform the following functions: (1) panel erase and initialize cursor; (2) character write and move cursor; (3) backspace and move cursor; (4) line feed and move cursor; (5) new line (erase remainder of line) and initialize cursor.

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Universal A/N Panel Sequence

In a gas panel display designed for alphanumeric use in a conventional typewriter mode, a universal control sequence using the control architecture illustrated in the accompanying flow diagram is both flexible and inexpensive. The architecture is designated universal in that it will perform the following functions: (1) panel erase and initialize cursor; (2) character write and move cursor; (3) backspace and move cursor; (4) line feed and move cursor; (5) new line (erase remainder of line) and initialize cursor.

Referring to the flow diagram, an erase panel command checks the column or frame end carry and if positive, conditions the character generator to write a cursor. If negative, a signal is issued to inhibit the character generator. If the erase panel command is negative, a new line command will be issued which, if positive, will then initiate erase panel command. The new line command, if negative, will check the second pass flag which, if positive, will condition the character generator to write a cursor, or, if negative, will generate a backspace, line feed or new line command; any of which will inhibit the character generator. When the character generator is inhibited, the writing sequence writes blanks.

When the character generator is conditioned, the present character location is written and the erase panel command is tested. If positive, the column or frame end carry is checked which, if positive, will terminate the command, and, if negative, will step to the next column location. If the erase panel command is negative, a new line command will be checked and, if positive, will test the column or frame end carry and terminate the command as described above, or, if negative, will check the second flag pass to either terminate the command or check the space function command.

The space function command has thr...