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Browse Prior Art Database

Gas Panel Slice Buffer Having Bit With Dual Function

IP.com Disclosure Number: IPCOM000084069D
Original Publication Date: 1975-Sep-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Troan, LE: AUTHOR

Abstract

In a gas panel display adapted to display both alphanumeric and graphic information, an all points addressable technique is utilized in which each individual point on the display is individually addressed.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 69% of the total text.

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Gas Panel Slice Buffer Having Bit With Dual Function

In a gas panel display adapted to display both alphanumeric and graphic information, an all points addressable technique is utilized in which each individual point on the display is individually addressed.

In the alphanumeric mode, characters in the illustrated embodiment are displayed in a 7 x 14 character font with the cursor positioned in the 16th row, whereby 16-bit vertical slices are utilized. In the graphics mode, all 16 bits of each vertical slice are used for data, while in the alphanumeric mode, the last vertical slice of the character font causes the panel to automatically bump to the next character position.

One way of accomplishing this is to have a "stop"-bit in the last vertical slice of the character font, but if this stop-bit is part of the character font it will be displayed unless degated from the gas panel drivers. This problem is resolved in the following manner.

Referring to the drawing, a 16-bit slice buffer is illustrated in which bit positions 1 through 8 represent high data, while bit positions 9 through 16 represent low data. Bit 15 represents, as previously described, a stop-bit for alphanumeric information or a data bit for graphic information. To decode the bit, an alphanumeric graphics latch 1 conditions logical AND circuit 3 when set in the graphics mode. Bit 15 from the slice buffer constitutes the second input to logical AND circuit 3.

If the device is in the alphanumeric mode,...