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• If the system already has an internal bootable hard drive (lDE,
ESDI, ST506), the drivers for the SCSI device(s) must reside
on the internal bootable hard drive.
• For non-PCI devices, whenever installing multiple host bus
adapters in one system, each card must be set to a different base
BIOS address, as long as the primary adapter has a lower base
BIOS address than the secondary adapters. Also, make certain
each adapter is set to a different base I/O address and IRQ .
In SDMS 3.0, the SCSI BIOS for each of the NCR family of PC
SCSI chips is capable of mapping SCSI hard disk drives behind
any non-SCSI hard disk drives (IDE, ESDI, etc.) within the same
system. A driverless solution will allow up to eight hard drives
(SCSI and non-SCSI) to be connected under DOS 5.0 and above.
The SCSI BIOS also supports removable drives with 512-byte
sectors as long as the media is in the drive at boot-up and remains
in the drive during system operation.
Low level Virtual DMA Services (VDS) are supported by the
SCSI BIOS. Therefore, to gain maximum performance, any double
buffer option provided by disk caching software (such as
Microsoft's SMARTDRV.EXE) should be disabled for all drives
handled through SDMS. For full VDS support, including features
such as scatter-gather, DOSCAM must be loaded in the
CONFIG.SYS file. Connecting peripherals other than hard disk
drives will also require loading the appropriate driver(s). Some of
the drivers work together, and some are capable of direct commu-
nication with an NCR SCSI BIOS (see the diagram below). The
following sections list these drivers, their features, and their
loading requirements.
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PCA-6157/6157L User's Manual
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