Video Memory; Text Modes - NEC POWERMATE 4100M Service Manual

1-12 Technical Information

Video Memory

The 1 MB of on-board video DRAM is expandable to 2 MB and provides graphic resolu-
tions of or 640 x 480 with 16.8 million colors, 800 x 600 with 64K colors, 1024 x 768 with
256 colors, or 1280 x 1024 with 16 colors. Table Section 1-5 and Table Section 1-6 pro-
vide the different display modes for the video controller.
Mode
(Hex) Colors
1
00 16 (grey)
2
00 16 (grey)
3
00 16
1
01 16
2
01 16
3
01 16
1
02 16(grey)
2
02 16(grey)
3
02 16
1
03 16
2
03 16
3
03 16
4
07 mono
3
07 mono
5
60 16
5
24 16
1
CGA-style text mode with 8x8 character size and 200 lines vertical resolution.
2
EGA-style text mode with 8x14 and 9x14 character sizes and 350 lines vertical resolution.
3
VGA-compatible text mode with 9x16 character size and 400 lines vertical resolution.
4
MDA- style text mode with 9x14 character sizes and 350 lines vertical resolution.
5
Enhanced VGA mode.
Table Section 1-5 Text Modes
Column/
Rows Buffer
40 x 25 B8000
40 x 25 B8000
40 x 25 B8000
40 x 25 B8000
40 x 25 B8000
40 x 25 B8000
80 x 25 B8000
80 x 25 B8000
80 x 25 B8000
80 x 25 B8000
80 x 25 B8000
80 x 25 B8000
80 x 25 B8000
80 x 25 B8000
132 x 25 B8000
132 x 30 B8000
Video
Clock
Resolution (MHz)
320 x 200 28.2
320 x 350 28.3
360 x 400 28.2
320 x 200 28.2
320 x 350 28.2
360 x 400 28.2
640 x 200 28.2
640 x 350 28.2
720 x 400 28.2
640 x 200 28.2
640 x 350 28.2
720 x 400 28.2
720 x 350 28.2
720 x 400 28.2
1056 x 400 40.0
1056 x 400 40.0
Horiz
Sync Vert Sync
(kHz) (Hz)
31.7 70
31.7 70
31.7 70
31.7 70
31.7 70
31.7 70
31.7 70
31.7 70
31.7 70
31.7 70
31.7 70
31.7 70
31.5 70
31.5 70
30.5 67.5
30.5 67.5