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Browse Prior Art Database

Multiple Display Buffer Addressing Modes

IP.com Disclosure Number: IPCOM000119703D
Original Publication Date: 1991-Feb-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 2 page(s) / 69K

Publishing Venue

IBM

Related People

Akiyama, A: AUTHOR [+3]

Abstract

Described is the concept of a Workstation Controller (WSC) writing to a partition within a large display buffer in a single operation.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 54% of the total text.

Multiple Display Buffer Addressing Modes

      Described is the concept of a Workstation Controller
(WSC) writing to a partition within a large display buffer in a
single operation.

      For fixed function terminals, the display buffer (sometimes
referred to as the Presentation Space) is addressed by the
Workstation Controller (WSC) as one large sequential space.  When
addressing the buffer, addresses are relative to row 1, column 1
(sequential address X'0000') of the buffer.  Addresses wrap
sequentially from the rightmost column position in the buffer
(address 'N') to the leftmost column position on the next row in the
buffer (address 'N+1').  Row 1, column 1 is referred to as the
"origin" of the buffer.  Fig. 1 gives an example of how a fixed
function display buffer is addressed.

      For a display which contains a display buffer that can be
partitioned into multiple partitions, it is necessary in many
situations for the WSC to be able to address the display buffer
relative to the origin of a particular partition rather than the
origin of the display buffer.

      When data is to be written to one of the partitions (such as
writing a pop-up menu), it is desirable to be able to address the
display buffer relative to the origin of the partition where the data
is to be written and also have the sequential data be written
entirely within the partition; treating the partition as if it was
the entire buffer (from an addressing point of view).

     ...