Browse Prior Art Database

Column Separators for CRT Display

IP.com Disclosure Number: IPCOM000050170D
Original Publication Date: 1982-Sep-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Millar, PL: AUTHOR [+5]

Abstract

Column separator marks for data entry on a CRT terminal are displayed as dots in the lower corners of each character position, instead of single vertical lines as in U.S. Patent 4,146,879. Also, character underscore s are segmented instead of continuous when both column separators and underscore are present in a display field.

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Column Separators for CRT Display

Column separator marks for data entry on a CRT terminal are displayed as dots in the lower corners of each character position, instead of single vertical lines as in U.S. Patent 4,146,879. Also, character underscore s are segmented instead of continuous when both column separators and underscore are present in a display field.

Fig. 1 shows dot matrix characters in a raster scan CRT display terminal. Each character is located in a box twelve scans (S0-S11) high and nine dot times (T0-T8) wide. The scans may be interlaced, S0,S2, etc., occurring in an even field (E), the others in an odd field (0). The short vertical arrows in Fig. 1 mark the edges of each character box. Within each box, a 7x9 character image occupies scans S1-S9 and dots T1-T7. Field "A" shows a character and a blank space for which the column separator (C0LS) attribute is set. Every character box in this field has dots T0 and T8 of scan S11 set, so that an operator can see where new data can be entered. Field "B" shows the normal underscore (UNSC) attribute. Dots T0 through T8 of scan S11 form a continuous line under all characters of the field. In field "C", both the COLS and UNSC attributes are active. In this case, it is desirable for the operator to be able to determine where each character boundary is; therefore, the underscore is segmented by turning dots T0 and T8 off in scan S11. That is, the column-separator dots are turned off when an underscore is also present.

Fig. 2 shows an implementa...