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READ.ME
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This subdirectory contains useful utilities to change some XGA parameters.
P70.EXE
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P70 /u
This utility will disable the IBM Model P70 plasma display and place a
Micro Channel installed XGA adapter into VGA mode if there is an XGA Micro
Channel adapter card installed in the system, and if the XGA card has a
display connected. The utility will not switch to the XGA card if the system
board XGA has a display connected.
Use the /u (undo) option to return to the plasma display.
Use the /h or the /? option for help.
XVGARATE.EXE
------------
XVGARATE [rate] [nowarn]
This utility should be used if an XGA-2 subsystem is being used as the
primary VGA source in a system and a Multi-Scan type of display is
attached.
Most Multi-Scan type of displays respond as an IBM 8514 display when
interrogated by the XGA-2 subsystem Power-On Self Test (POST) program.
As a result the VGA video will be displayed at the '60' rates shown below
(the normal VGA rate for IBM 85XX displays).
However, if the attached display can accept one of the two alternative
faster video rates, this utility may be used to override the default
rate.
WARNING: If this override is used in an AUTOEXEC.BAT or
CONFIG.SYS, then care must be taken to ensure that the parameters
specified are suitable for the attached display. Selecting the wrong
video rate may result in VGA video not being displayed correctly, or even
(in some cases) damage to the display over time.
If a rate is chosen which the display cannot support, the system must be
rebooted.
Resolution Frame Rate Line Rate PEL Rate
---------- ---------- --------- --------
[rate] = 60 640 x 480 60Hz 31.6KHz 25.175MHz
720 x 350 70Hz 31.6KHz 28.322MHz
720 x 400 70Hz 31.6KHz 28.322MHz
[rate] = 72 640 x 480 72Hz 37.8KHz 30.250MHz
720 x 350 84Hz 37.8KHz 34.000MHz
720 x 400 84Hz 37.8KHz 34.000MHz
[rate] = 75 640 x 480 75Hz 39.4KHz 31.500MHz
720 x 350 88Hz 39.4KHz 35.500MHz
720 x 400 88Hz 39.4KHz 35.500MHz
[nowarn] = NOWARN prevents the Y/N WARNING before execution.
Use the /h or the /? option for help.
Use the help option to determine the current display refresh rate.
P75.EXE
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P75 /u
This utility will select the IBM Model P75 plasma display as the primary
VGA display and disable the VGA output on the Micro Channel installed
XGA adapter.
Use the /u (undo) option to return VGA output to the XGA adapter.
Use the /h or the /? option for help.