Browse Prior Art Database

Vertical Field Attribute

IP.com Disclosure Number: IPCOM000102011D
Original Publication Date: 1990-Oct-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Ohtaka, Y: AUTHOR [+2]

Abstract

A Field Attribute is currently architected being effective in a horizontal direction. This article describes this Field Attribute (FA) to extend the function for a vertical character field. (See Fig. 1.)

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Vertical Field Attribute

       A Field Attribute is currently architected being
effective in a horizontal direction.  This article describes this
Field Attribute (FA) to extend the function for a vertical character
field.  (See Fig. 1.)

      Described below is an example to implement the Vertical Field
Attribute (VFA).  The construction of FA code is shown in Fig. 2.
The Vertical/Horizontal Bit is a newly architected bit which
indicates whether the FA is effective vertically or horizontally.

      The block diagram of Fig. 3 is an example of using a Row Buffer
method.  Construction of character code plane (display format) is 6
columns by 5 rows in this case.

      Display controller accesses every row in the plane according to
the displayed row and transfers the data to an Attribute Processor
for displaying characters.  At the same time, the VFA contents are
also transmitted to a VFA detecting circuit which sends VFA data to
the Row Buffer only when VFA is detected.  If there is no VFA in a
certain row, the Row Buffer is not updated and the previous VFAs are
kept.

      In such a manner, the VFA in a second row and a third column
is written into the third column in the Row Buffer, as shown in Fig.
3, and is effective for every third column in the third row.