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The GDT ASPI Manager GDTASPI.EXE allows you not only to run
Not Direct Access Devices
(e.g.,
CD-ROMs, tapes, MODs etc.), but to control hard disks and removable hard disks, too (the
so-called
Direct Access Devices
). These devices are then no longer controlled by GDTSETUP but
exclusively by the ASPI interface. The advantage is evident, in particular with regard to re-
movable hard disks (for example SyQuest). When using an appropriate ASPI module to ac-
cess these removable hard disks, for example ASPIDISK.SYS or UNI_ASP.SYS from Corel,
you can exchange the media of these drives under DOS without having to use GDTSETUP.
To the ASPI interface, the ICP Controller appears as one host-adapter (when using single-
channel ICP Controllers), or as several host-adapters (when using multi-channel ICP Con-
trollers). Host adapter 0 (H0) corresponds to SCSI channel A, host adapter 1 (H1) to SCSI
channel B, etc. . If there are more SCSI controllers (even if from various manufacturers) in
the system and corresponding ASPI managers have been installed in the CONFIG.SYS file,
you can determine a controller's host adapter number by using the GDT program
ASPISCAN.EXE
(in case of multi-channel ICP Controllers, this program also shows which
host adapter numbers have been assigned to the various SCSI channels). In order to ex-
clude that a
Direct Access Device
is run directly from the ICP Controller, it has to be reserved
for the ASPI interface control. To do so, certain parameters have to be specified when the
GDT ASPI manager is loaded:
DEVICE=GDTASPI.EXE /R:Hx1Iy1[:Hx2Iy2:Hx3Iy3 ...]
H:
host adapter number
I:
SCSI ID of the SCSI device to be reserved
x1, y1:
host adapter number, SCSI ID
of the first SCSI device to be reserved
(in decimal form)
x2, y2:
host adapter number, SCSI ID
of the second SCSI device to be reserved
(in decimal form)
Example: We assume that there is only one ICP Controller in the system. Two
direct access
devices
, the SyQuest removable hard disk connected to channel A, ID 2, and the Quantum
hard disk connected to channel B, ID 4, have to be reserved for the ASPI manager. The cor-
responding entry in the CONFIG.SYS is:
DEVICE=GDTASPI.EXE /R:H0I2:H1I4
Important note: SCSI devices reserved for the ASPI manager must not have been initialized
with GDTSETUP. Neither must they pertain to a GDT Logical or Host Drive. If necessary,
these devices can be de-initialized with GDTSETUP.
As already mentioned in paragraph 6 of this chapter, in addition to the ASPI manager an
ASPI module has to be present in order to be able to access the SCSI device under MS-DOS
with a drive name (e.g., D, E, etc.). In the following description you find how to install ASPI
interface-reserved
direct access devices
with the ASW ASPI module ASPIDISK.SYS and the corel-
SCSI ASPI module UNI_ASP.SYS.
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Step 1:
Include GDTX0000.EXE, GDTASPI.EXE with appropriate reservations (../R:..), and
ASPIDISK.SYS in the CONFIG.SYS file, then do a warm reboot (Ctrl+Alt+Del).
