HP Vectra XU 5/XX HP Vectra XU PC Series - Technical Reference Manual, D3080-9 - Page 60

Video Modes

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Video Modes The video subsystem is responsible for generating the video data which is placed in memory to be accessed by the display. The video subsystem supports the following video modes: • Monochrome Display Adapter (MDA) • Color Graphics Adapter (CGA) • Enhanced Graphics Adapter (EGA) • MultiColor Graphics Array (MCGA) • Video Graphics Array (VGA) • Video Electronics Standard Association (VESA). The following table details the standard VGA modes which are currently implemented in the video BIOS of the HP Vectra XU PC. These modes are supported by standard BIOS and DOS functions; that is, the video BIOS (which is mapped contiguously between addresses C0000h and C7FFFh) contains all the routines required to configure and access the video subsystem. Standard VGA Modes Mode No. 00h 01h 02h 03h 04h 05h 06h 07h 0Dh 0Eh 0Fh 10h 11h 12h 13h Standard CGA CGA CGA CGA CGA CGA CGA MDA EGA EGA EGA EGA VGA VGA VGA Interface Type text text text text graphics graphics graphics text graphics graphics graphics graphics graphics graphics graphics Resolution 40 x 25 40 x 25 80 x 25 80 x 25 320 x 200 320 x 200 640 x 200 720 x 350 320 x 200 640 x 200 640 x 350 640 x 350 640 x 480 640 x 480 320 x 200 No. of Colors 16 16 16 16 4 4 2 2 16 16 2 16 2 16 256 Vertical Refresh 70 Hz 70 Hz 70 Hz 70 Hz 70 Hz 70 Hz 70 Hz 70 Hz 70 Hz 70 Hz 70 Hz 70 Hz 60 Hz 60 Hz 70 Hz Horizontal Refresh 31.5 kHz 31.5 kHz 31.5 kHz 31.5 kHz 31.5 kHz 31.5 kHz 31.5 kHz 31.5 kHz 31.5 kHz 31.5 kHz 31.5 kHz 31.5 kHz 31.5 kHz 31.5 kHz 31.5 kHz Buffer Start Address B8000h B8000h B8000h B8000h B8000h B8000h B8000h B0000h A0000h A0000h A0000h A0000h A0000h A0000h A0000h When the PC is operating in one of the enhanced modes, all accesses to the controller must be made with HP Ultra VGA drivers and utilities such as those supplied with the HP Vectra XU PC. For further details, refer to the README files that come with the utilities. Enhanced graphics controller functions and video memory are accessed via I/O instructions to the video controller. For programming information refer to the manufacturer's data book. The VESA video modes supported by the video BIOS are: VESA Video Modes Vectra XU Technical Reference The Integrated Ultra VGA Controller • 60

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Vectra XU Technical Reference
The Integrated Ultra VGA Controller
•
60
Video Modes
The video subsystem is responsible for generating the video data which is placed in memory
to be accessed by the display. The video subsystem supports the following video modes:
•
Monochrome Display Adapter (MDA)
•
Color Graphics Adapter (CGA)
•
Enhanced Graphics Adapter (EGA)
•
MultiColor Graphics Array (MCGA)
•
Video Graphics Array (VGA)
•
Video Electronics Standard Association (VESA).
The following table details the standard VGA modes which are currently implemented in the
video BIOS of the HP Vectra XU PC. These modes are supported by standard BIOS and
DOS functions; that is, the video BIOS (which is mapped contiguously between addresses
C0000h and C7FFFh) contains all the routines required to configure and access the video
subsystem.
Standard VGA Modes
Mode
No.
Standard
Interface
Type
Resolution
No. of
Colors
Vertical
Refresh
Horizontal
Refresh
Buffer
Start
Address
00h
CGA
text
40 x 25
16
70 Hz
31.5 kHz
B8000h
01h
CGA
text
40 x 25
16
70 Hz
31.5 kHz
B8000h
02h
CGA
text
80 x 25
16
70 Hz
31.5 kHz
B8000h
03h
CGA
text
80 x 25
16
70 Hz
31.5 kHz
B8000h
04h
CGA
graphics
320 x 200
4
70 Hz
31.5 kHz
B8000h
05h
CGA
graphics
320 x 200
4
70 Hz
31.5 kHz
B8000h
06h
CGA
graphics
640 x 200
2
70 Hz
31.5 kHz
B8000h
07h
MDA
text
720 x 350
2
70 Hz
31.5 kHz
B0000h
0Dh
EGA
graphics
320 x 200
16
70 Hz
31.5 kHz
A0000h
0Eh
EGA
graphics
640 x 200
16
70 Hz
31.5 kHz
A0000h
0Fh
EGA
graphics
640 x 350
2
70 Hz
31.5 kHz
A0000h
10h
EGA
graphics
640 x 350
16
70 Hz
31.5 kHz
A0000h
11h
VGA
graphics
640 x 480
2
60 Hz
31.5 kHz
A0000h
12h
VGA
graphics
640 x 480
16
60 Hz
31.5 kHz
A0000h
13h
VGA
graphics
320 x 200
256
70 Hz
31.5 kHz
A0000h
When the PC is operating in one of the enhanced modes, all accesses to the controller must
be made with HP Ultra VGA drivers and utilities such as those supplied with the HP Vectra
XU PC. For further details, refer to the README files that come with the utilities.
Enhanced graphics controller functions and video memory are accessed via I/O instructions
to the video controller. For programming information refer to the manufacturer's data book.
The VESA video modes supported by the video BIOS are:
VESA Video Modes