Introduction And Specifications; Introduction - Zenith Data Systems Z-100 Series Installation Manual

Chapter 1
Introduction and Specifications
Introduction
The Z-329 Monochrome Video Card interfaces between the computer sys-
tem and the video monitor. The Z-329 Card provides a video output com-
patible with the output from an IBM monochrome video card.
The Z-329 Card provides one page of memory stored in static RAM. Two
pages (interlaced) or four pages (non-interlaced) of data can be stored
if the optional 8K x 8 RAMs are installed. The characters are stored
in ASCII code. An 8-bit attribute byte, also stored in RAM, is associated
with each ASCII character. The characters are converted into pixel drive
data by a character ROM located on the card. The ROM converts the
ASCII code into the correct pixel drive data to create the characters on
the monitor.
Up to 80 characters can be displayed in each of the 25 lines of the display.
The attributes allow any character to be blanked (not displayed), blink,
underlined, intensified, or displayed in reverse video (black on white).
The addresses of the control registers and of the memory on this card
are different than those of the other video cards available with the
Z-100@)PC. This means that the standard video card (red-green-blue dis-
play, low/high-resolution graphics) and the Z-319 Bit-Mapped Video
Graphics Card (Z-100 compatible, high-resolution graphics) can be left
in the computer.
@Z-100 is a trademark of Zenith Data Systems Corporation.