2. Getting Started
9
SYSTEM RECOMMENDATIONS
Connecting to the analog CRT interface and the optional Feature connector are
discussed in the following topics.
Analog Video Interface
The ZT 6631 must be used with an analog monitor. If your monitor is capable of both
digital and analog modes, be sure it is set to analog.
Ziatech has tested the ZT 6631 video board with the NEC Multi-Sync (VGA compatible)
family of monitors, the Amdek 310A monochrome monitor, the IBM PS/2
®
monitor, the
Smartron SC-431 VGA monitor, and the Mitsubishi HL7955 high resolution, multiscan,
19-inch VGA monitor. We recommend that you use one of these displays with the
ZT 6631, although any IBM compatible display should work.
Discussion of monitor timing specifications for supporting various display modes is
provided in Appendix B, "
Video Modes
."
The ZT 6631 can be used in a wide variety of video applications. There are several
considerations, however, that you must take into account when setting up a video
system to ensure the best quality display. Such factors as environment, noise from
surrounding equipment, video mode, distance from video source, and cabling all come
into play.
The analog video signals are comprised of a horizontal and vertical sync and three color
signals (red, green, and blue). The signals are driven by a RAMDAC which is used to
convert the digital video data to analog signals. The RAMDAC's analog outputs have an
impedance of 75 ohms. Ideally, the connecting cable to this output should have an
impedance of 75 ohms. Flat cable, which is often more convenient to use, has an
impedance of approximately 100 ohms.
A flat cable connection does cause some mismatch but does not noticeably degrade the
quality of the video display over medium length runs. Ziatech has successfully run
analog video over 15 feet in graphics mode with standard 28 gauge unshielded flat
cable with no noticeable degradation to the display. The preferred method, however, is
to switch from flat cable to 75 ohm cable and install it as close to the output connector
as possible.
Feature Connector
The ZT 6631 has a Feature connector that can be used for video overlay applications or
to drive flat panel displays that use a Feature connector interface (such as Planar
EL640.480-A). The Feature connector uses a 26-pin, double row, 0.050 inch spaced
connector. The connector is located above the VGA connector.
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