SVGA Windows Accelerator Adapter (250-4055)  Settings   Faxback Doc. # 2183

Jumper W2 is a zero wait state jumper. It enables the adapter to generate
wait state memory write cycles, thus improving performance.

Jumper settings are listed in the following table:

Jumper   Setting             Explanation

W2       Jumpered*           Generate zero wait state for high performance.

         Not Jumpered        Do not generate zero wait state

* Indicates factory setting.

If your computer does not support zero wait state operation, you will need
to change the jumper setting. Leave the Zero Wait State Jumper installed; if
you experience screen data loss, park the jumper on one pin of W2 to disable
zero wait state operation.

Dip Switch Settings:

Note: Some switches are sensed only when you turn on the computer, so always
turn off the computer before changing switch settings.

Set Switches 1 and 2 for the monitor frequency for the 800 x 600 modes. Set
Switches 3 and 4 to set the monitor frequency for the 1024 x 768 modes. Set
Switch 5 to select the monitor frequency (horizontal frequency rate) for
Standard VGA Modes 0 through 13.

The following switch setting tables list the VGA modes available and the
monitor frequencies required for each setting.

Note: Change the switches only if you have a monitor and software that
support a different frequency than the one set by default. Refer to your
monitor documentation for information.

SW1--Switches 1 and 2 (800 x 600 Mode Setting Only)

Switch 1    Switch 2    Monitor Frequency Required

OFF*        OFF*        Vertical: 56 Hz, Non-interlaced
OFF         ON          Vertical: 60 Hz, Non-interlaced
ON          OFF         Vertical: 72 Hz, Non-interlaced
ON**        ON**        Vertical: 56 Hz, Non-interlaced

*  Indicates factory setting.
** This setting produces the same results as the factory setting.

SW1--Switches 3 and 4 (1024 x 768 Mode Setting Only)

Switch 3    Switch 4    Monitor Frequency Required

OFF*        OFF*        Vertical: 87 Hz, Non-interlaced
OFF         ON          Vertical: 60 Hz, Non-interlaced
ON          OFF         Vertical: 70 Hz, Non-interlaced
ON          ON          Vertical: 72 Hz, Non-interlaced

* Indicates factory setting.

Switch 5  (Timing for Standard Modes, 0 to 13)

Switch 5    Monitor Frequency Required

OFF*        Horizontal: 31.5 kHz
ON          Horizontal: 40 kHz

* Indicates factory setting.

Memory Location Information:

The SVGA Windows Accelerator Adapter uses memory locations A0000-C7FFF for
display memory and the extended video BIOS. These are the same locations
used by a standard VGA adapter. If an EMS (Expanded Memory Specification)
adapter or other device currently uses these memory locations, reconfigure
the device to use other memory locations. For an EMS adapter, you can
usually designate the exclusions when starting the EMS driver. Consult
your device documentation to determine the memory locations used.