Specifications

The ASPI OS/2 Disk Driver
The SCSIOl.SYS disk driver is similar to the OS/2 DISKOl.SYS
driver. It also supports the multitasking feature of the SCSI adapter
card.
Keep in mind that SCSIOl.SYS does the following:
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It is currently limited to two hard disk drives.
It does not use the ROM BIOS for interrupt 13h requests.
Instead, it emulates interrupt 13h through the multitasking
ASPI OS/2 Manager.
It uses the OS/2 seek optimization routines when queuing disk
requests.
It assumes that all SCSI hard disk drives support the extended
VERIFY command.
It sends SCSI requests through the ASPI OS/2 Manager rather
than through the cache used for requests for standard hard
disk drives.
It supports multitasking between multiple drives and other
devices on the SCSI interface, and makes full use of the low
overhead provided by the SCSI adapter card’s Bus Master DMA
and intelligent I/O processing.
The following functions are not currently implemented:
❏ Support for the high performance disk caching and Fault
Tolerance of the LAN Manager 1.1
❏ The ABORT function of the SCSI Programming Interface.
5-4
Installing Software Drivers for OS/2