System Board
Contents
Chapter 1
Chapter 2
Chapter 3
Chapter 5
Chapter 6
Chapter 3
3/14 LS PRO HARDWARE TECHNICAL REFERENCE
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
Type
Colours
Displayed
Chars
Character
Cell
Pixels
0, 1
Text
16/256K
40x25
9x16
360x400
2, 3
Text
16/256K
80x25
9x16
720x400
4, 5
Graphics
4/256K
40x25
8x8
320x200
6
Graphics
2/256K
80x25
8x8
640x200
7
Text
-
80x25
9x16
720x400
D
Graphics
16/256K
40x25
8x8
320x200
E
Graphics
16/256K
80x25
8x8
640x200
F
Graphics
-
80x25
8x14
640x350
10
Graphics
16/256K
80x25
8x14
640x350
11
Graphics
2/256K
80x30
8x16
640x480
12
Graphics
16/256K
80x30
8x16
640x480
13
Graphics
256/256K
40x25
8x8
320x200
58
Graphics
16/256K
100x37
8x16
800x600
5C
Graphics
256/256K
100x37
8x16
800x600
5D
Graphics
16/256K
128x48
8x16
1024x768
5F
Graphics
256/256K
80x30
8x16
640x480
60
Graphics
256/256K
128x48
8x16
1024x768
64
Graphics
64K
-
-
640x480
65
Graphics
64K
-
-
800x600
66
Graphics
32K
-
-
640x480
67
Graphics
32K
-
-
800x600
6C
Graphics
16/256K
160x64
8x16
1280x1024
6F
Graphics
64K
40x25
8x8
320x200
70
Graphics
16M
40x25
8x8
320x200
71
Graphics
16M
80x30
8x16
640x480
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.
Summary of Contents for Apricot LS Pro
Page 1: ...apricot HARDWARE TECHNICAL REFERENCE MITSUBISHI ELECTRIC LS Pro ...
Page 2: ...HARDWARE TECHNICAL REFERENCE ...
Page 6: ...CONTENTS ...
Page 9: ...Chapter 1 INTRODUCTION ...
Page 14: ...Chapter 2 SYSTEM UNIT ...
Page 37: ...Chapter 3 SYSTEM BOARD ...
Page 60: ...Chapter 4 PERIPHERAL ITEMS ...
Page 91: ...Chapter 5 MEMORY AND I O USAGE ...
Page 118: ...Appendix A SPECIFICATIONS ...
Page 125: ...Appendix B REVISION C SYSTEM BOARD ...
Page 130: ...ERROR BEEP CODES Appendix C ...
Page 134: ...INDEX ...