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dows - unlike, for example, hard disks and removable hard disks. To install and access these
devices, a special standard, the so-called ASPI Standard (Advanced SCSI programming In-
terface), has been created. While the manufacturer of the controller (in this case ICP) has to
offer the ASPI Manager, the manufacturer of the SCSI device (CD-ROMs etc.) has to provide
an ASPI Module (note: there are some companies which have specialized in the develop-
ment of ASPI modules, for example Corel Corp. with its product
corelSCSI
; the ICP Con-
troller is certified by Corel). Both units, the SCSI controller and the SCSI device,
communicate through this ASPI interface. It is not a hardware interface (like, for example,
Centronics, SCSI or RS232), but a pure software interface.
The following illustration explains this interface:
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(Hardware: SCSI CD-ROM drive)
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(Software: driver for CD-ROM)
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(GDTASPI.EXE)
(Software: ASPI Manager for the ICP
Controller)
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(Hardware: SCSI Controller)
With the following two examples we demonstrate how to install a CD-ROM drive for use
with the ICP Controller under MS-DOS and Windows. The installation differs slightly, de-
pending on whether you use the corelSCSI software or the ASW software. Regardless of
which software you choose to use, the ASPI manager of the ICP Controller (located on the
GDT System Disk - DOS
) has to be loaded from the CONFIG.SYS file. The objective of both
installations is to make the CD-ROM drive accessible as a drive (for example drive E) under
MS-DOS or Windows, and to be able to access this drive just as if it were a (write-protected)
floppy disk in drive A or B.
At this point we presume that the CD-ROM drive has been properly connected to the ICP
Controller. This includes that the SCSI-ID and the SCSI bus terminators are set in accor-
dance with the settings of the already existing SCSI devices (i. e., the SCSI-ID chosen for the
CD-ROM drive is not occupied by another device; resistor terminators are located only at
the two ends of the SCSI bus).
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The important lines in both files are printed bold.
CONFIG.SYS
device=c:\windows\himem.sys
device=gdtx000.exe
files=30
buffers=30
stacks=9,256
dos=high,umb
shell=\COMMAND.COM /E:512 /P
device=\dos\setver.exe
device=\gdt\gdtaspi.exe
device=\aspi\aspicd.sys /D:CD-ROM
lastdrive=h