Video Adapter; General - Mitsubishi Electric LS Pro Hardware Technical Reference

System Board
3.5

VIDEO ADAPTER

General

The video adapter on the LS Pro system board is based on either a Cirrus Logic
CL-GD5422 or 5426 chip. These chips contain all the elements of a VGA controller,
except display memory, providing 100% compatibility with the IBM VGA standard.
The video controller consists of the GD542X, 1 Mbyte of display memory and a 7.6mA
current reference. Video dot clocks vary from 25 to 65 MHz depending on video mode.
Software support is provided by a video BIOS included in the system BIOS.
In addition to full compatibility with the VGA standard the video controllers support
a range of enhanced video modes.
The video modes available are given in the following table:
Mode
0, 1
2, 3
4, 5
6
7
D
E
F
10
11
12
13
58
5C
5D
5F
60
64
65
66
67
6C
6F
70
71
Note
Mode 6C is interlaced only.
Sync signals output to the monitor are at TTL levels while the analogue video
outputs are at 0 to 0.7 volts.
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