Specifications

Enables video buffering for applications that write large

amounts of data directly to video memory. (Valid with

ASPI4DOS.SYS only.) The driver attempts to allocate a

64KB video buffer from extended memory. If no

extended memory is available, the driver allocates 64KB

from conventional memory.

If you use /V with /W or /WM, the driver allocates only

one 64KB buffer for both video and virtual mode

buffering. (You can specify /V or /VM, described below,

but not both.)

/VM

Enables video buffering using 64KB from conventional

memory. (Valid with ASPI4DOS.SYS only.) Use /VM if

your computer does not have extended memory.

If you use /VM with /W or /WM, the driver allocates

only one 64KB buffer for both video and virtual mode

buffering. (You can specify /V or /VM, but not both.)

/Xnn

Sets the Bus Master transfer speed of the SCSI adapter

card. (Valid with ASPI4DOS.SYS only.) This overrides

the default speed set on the card itself. Specify a

hexadecimal value as follows:

00 = 5.OMB/sec

01 = 6.7MB/sec

= 8.0MB/sec

03 = lO.OMB/sec

= 5.7MB/sec

Normally, the SCSI adapter card is set for 5.OMB/sec.

Specify this switch for Standard mode only.

/Nnnn

Sets the BUS ON time. (Valid with ASPI4DOS.SYS only.)

Valid BUS ON times are between 2 and 15 µsecs. The

default time is 11 µsecs. This is a decimal value. Specify

this switch for Standard mode only.

/Fnn

Sets the BUS OFF time. (Valid with ASPI4DOS.SYS only.)

Valid BUS OFF times are between 1 and 64 µsecs. The

default time is 4 µ.secs. This is a decimal value. Specify

this switch for Standard mode only.

Disables the loading of the embedded interrupt 13

module. (Valid with ASPI4DOS.SYS only.) Use this

option for debugging purposes only.

4-6

Installing Software Drivers for MS-DOS