Configuration Jumpers - Zenith Z-100 Reference Manual

page 7.2
Video Graphics Programming
The following are features, functions, and capabilities of the video card:
Addressing, reading, and writing to the 16K video RAM with no timing restric-
tions or display interference
Foreground, background, and border color selection
Text mode or pixel addressable graphics mode selection
Selection of one of four built-in 256-character ROM fonts
Up to 128 user-defined characters
7 or 14 MHz video bandwidth, mode dependent
Monochrome and/or color (RGB) output
Internal and external vertical, horizontal and/or composite sync selection
Light pen interface
Cursor type selection (block, line, blinking, etc.)
Cursor position selection

Configuration Jumpers

This section describes the optional functions obtainable through the positioning
of the configuration jumpers located on the video card.
When using the following instructions, if you need to access and/or remove the
video card, refer to the service manual for disassembly, card removal, and card
replacement procedures.
CAUTION: This product contains Electrostatic-Sensitive Devices (ESD). Exercise
extreme care when handling these devices to prevent damage.
Refer to Figure 7.1 for location of the hardware jumpers mentioned in the following
paragraphs.
The eight configuration jumpers located on your video interface card can be used
to set these initial power-up parameters: configure proper input polarity from
a light pen device, select the desired character font when the power is tumed
on, and configure sync type and polarity to drive different types of monitors.