http://greyghost.mooo.com/pccbbs/refdisks/xgadoc.txt

The XGA VESA BIOS Extensions allow the XGA/XGA-2 card to be VESA
compliant for SVGA applications or VESA compliant for XGA applications.
The VESA BIOS extension is a TSR (Terminate Stay Resident) program also
known as a memory resident program. There are 2 separate VESA BIOS
extensions:

SVGAVESA.COM VESA extension XGA/XGA-2 card VESA compliant for SVGA

XGAVESA.COM VESA extension XGA/XGA-2 card VESA compliant for for XGA

Video modes supported by the SVGAVESA TSR:

(The following modes are supported on XGA and XGA-2)

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³ ³
³ VESA Mode Description ³
³ ³
³ 100h 640x400x256 color packed pixel mode ³
³ 101h 640x480x256 color packed pixel mode ³
³ 105h(1) 1024x768x256 color packed pixel mode ³
³ 10Eh 320x200x64K color packed pixel mode ³
³ 111h 640x480x64K color packed pixel mode ³
³ 108h(2) 80 column 60 line text mode ³
³ 109h(2) 132 column 25 line text mode ³
³ 10Ah(2) 132 column 43 line test mode ³
³ 10Bh(2) 132 column 50 line text mode ³
³ 10Ch(2) 132 column 60 line text mode ³
³ ³
³ (1) This mode is only supported on the XGA adapter with an ³
³ 8514, 8515, 8516, or 8507 monitor. ³
³ ³
³ (2) These modes are only supported if an XGA in the system ³
³ is initially brought up in VGA mode. If the system has ³
³ VGA on the planar, no display can be attached to it. ³
³ ³ æØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØ«


(The following video modes are supported with SVGAVESA.COM only if an
XGA-2 card is installed. These modes are in addition to the ones listed
above)

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³ ³
³ VESA Mode Description ³
³ ³
³ 102h 800x600x16 color planar mode ³
³ 103h 800x600x256 color packed pixel mode ³
³ 114h(1) 800x600x64K color packed pixel mode ³
³ ³ æØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØØ«

(3) Known VESA SVGA applications that will not work with the SVGAVESA
TSR. Any VESA SVGA application that accesses the hardware directly,
instad of using BIOS, will not work because the SVGAVESA TSR is
implementing the SVGA modes with the XGA adapter in XGA mode. When the
adapter is in XGA mode, the VGA registers are not available. Therefore, applications that try to update the VGA video DAC via direct hardware
writes instead of using BIOS INT10 calls will fail. Also applications
that attempt to wait for a VGA-style vertical retrace signal will lock
up the system.


(4) SVGAVESA TSR supports all of the VESA calls defined in the VESA
SuperVGA standard VS911022-2 (dated 20/Oct/91) on XGA/A and XGA-2
adatpers except:

Function 01h - Return Super VGA mode information
D2 - Output functions supported in BIOS.
Output functions will not be supported

This does not mean that Function 01h is not supported, but only that the
BIOS does not support output functions like TTY output, scroll, pixel
output, etc..

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

https://wiki.osdev.org/VGA_Hardware

--- SoupGate-Win32 v1.05
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https://wiki.osdev.org/Getting_VBE_Mode_Info

VESA Defined Mode Numbers

For older versions of the VBE specification (VBE 1.0, VBE 1.1 and VBE
1.2) VESA defined some standard mode numbers. For example, mode 0x0113
was 800 * 600 * 15-bpp. In VBE 2.0 these mode numbers were deprecated -
VESA decided not to define any more of them, told video card
manufacturers they don't need to use the old standard mode numbers, and
told programmers to search for the mode they want without relying on any
of the old standard mode numbers. Despite this, it's still possible to
find obsolete information on the internet suggesting to use these old
standard mode numbers.

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

https://ardent-tool.com/disks/xga212.zip

VESA SVGA BIOS Extension TSR for the IBM XGA/A and XGA-2 Adapter
Version: 1.00 Release 05 12-16-92

The SVGAVESA TSR will only work if there is an XGA device (adapter or
chip) in the system that is currently running in VGA mode. This means
that if your system has a VGA on the planar or adapter, it CANNOT have a monitor attached to it.

SVGAVESA supports all of the VESA calls defined in the VESA SuperVGA
standard VS911022-2 (dated 20/Oct/91) on XGA/A and XGA-NI adapters
except:
Function 01h - Return Super VGA mode information
D2 - Output functions supported in BIOS.
Output functions will not be supported
This does not mean that Function 01h is not supported, but only that the
BIOS does not support output functions like TTY output, scroll, pixel
output, etc..

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

https://project-awesome.org/balintkissdev/awesome-dos

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

http://www.phatcode.net/res/221/files/vbe20.pdf

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)