Browse Prior Art Database

Design for Increasing Video Controller Personal Computer Memory Space

IP.com Disclosure Number: IPCOM000119822D
Original Publication Date: 1991-Mar-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 4 page(s) / 104K

Publishing Venue

IBM

Related People

Smith, BA: AUTHOR

Abstract

A design is described whereby video controller dynamic random-access memory (DRAM) capacity is increased without impacting usable planar board area within a personal computer (PC).

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 63% of the total text.

Design for Increasing Video Controller Personal Computer Memory Space

      A design is described whereby video controller dynamic
random-access memory (DRAM) capacity is increased without impacting
usable planar board area within a personal computer (PC).

      Due to the constraints imposed on the number of planar boards
that can be installed in a PC and the need for additional video
controller DRAM requirements, the concept described herein provides a
circuit orientation method whereby the amount of DRAM can be
increased from 256 KB to 512 KB without requiring additional planar
board area.

      As video controllers increase in functional capabilities, more
DRAM is required to support higher resolution monitors.  Typically,
this requires an increase in the amount of circuit board space to
place and wire up to sixteen twenty-pin plastic leaded chip component
(PLCC) modules.  Generally, a PC minimizes circuit board space by
packaging four modules and associated series resistors on a single
in-line package (SIP).  The SIP used on some PCs is a small
rectangular circuit card with thirty-two pins arranged in a zig-zag
pattern.  Each SIP contained 128 KB of DRAM enabling a standard video
graphics adapter (VGA)-based design to be handled in two packages.

      With the need for increased capacities for video controllers,
some new video modes require at least another 256 KB of DRAM.  The
design described herein provides a PC-compatible SIP package that
ad...