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KZPCM PCI–to–Dual Channel Ultra SCSI and 10/100MB Ethernet Host Adapter
1–2 EK–KZPCM–UG. B01
The KZPCM Host Adapter is a leading edge host adapter that supports bootable
devices and provides a powerful multi-tasking interface. Each channel on the
Host Adapter forms a separate SCSI bus together with its attached devices. The
SCSI buses can be connected to disk drives, CD-ROM drives, tape drives, and
other SCSI devices. More than one Host Adapter can be installed in the same
host computer.
The SCSI processor negotiates with each device on the SCSI bus to establish the
data transfer rate between the host adapter and the device. It also automates
SCSI command processing and significantly reduces the number of interrupts and
command overhead.
The Host Adapter supports multi-threaded I/O operations, thereby allowing
simultaneous operations on multiple SCSI targets or Logical Units (LUNs). In
systems with multiple targets, the Disconnect/Reconnect feature optimizes SCSI
bus usage. In systems that support fragmented memory buffers, the
Scatter/Gather feature provides high performance.
1.2 Physical Description
The KZPCM Host Adapter components are mounted on a 4 ¼ inch by 8 ¾ inch
PCB that is inserted in a PCI expansion slot in the host computer motherboard.
The PCB has separate connectors for each of the two available Ultra SCSI
channels. Channel A has two 68-pin connectors for Ultra-wide SCSI operation,
one for external devices and one for internal devices, and one 50-pin connector
for Ultra-narrow internal SCSI devices; channel B has two 68-pin connectors for
Ultra-wide SCSI operation, one for external devices and one for internal devices.
External connection to an Ethernet network is made through a shielded RJ45
connector for 8-conductor twisted pair cable.
Channel A and Channel B are equipped with both internal and external ultra-
SCSI wide (supports 15 devices) connectors; in addition, Channel A is equipped
with an internal ultra-narrow 50-pin connector. However, a DIGITAL
StorageWorks shelf with ultra-wide connections can run ultra-wide and ultra-
narrow drives concurrently.
The external bulkhead of the Host Adapter contains LED indicators that monitor
Ethernet activity.