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VRAM (Video RAM) Definition
DocumentID: 655839
Revision Date: 29-Feb-96 8:29:39 PM

The information in this document applies to:
WordPerfect® 5.1 for DOS

Problem

Solutions: VRAM - Video RAM: Video Random Access Memory chips are modified DRAMs on video boards to allow them to transfer a large number of bits from the memory array to a separate internal serial-shift register. After making the transfer, the contents of the shift register are independently shifted out to the video display.

The original VRAM was 64K-bit in size. It was followed by the 256K-bit device that combined the functionality of four 64K-bit VRAMs on a single chip. The latest VRAM generation is a 1-megabit device organized as 256K-by-4-bit with four 5 12-bit shift registers. With the increasing resolutions of graphics displays and denser memory devices, the VRAM is becoming indispensable to frame-buffer design. This definition was taken from the public domain program named PC-Glossary.

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