Asus P2B-LS P2B-LS User Manual - Page 30
ASUS P2B-L/P2B-S/P2B-LS User's Manual, Fast 50-pin/Wide 68-pin/Ultra2 68-pin SCSI Connectors,
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III. INSTALLATION 11. Fast (50-pin)/Wide (68-pin)/Ultra2 (68-pin) SCSI Connectors This motherboard has onboard 50-Pin Fast SCSI connector for 8-bit SCSI devices, 68-Pin Wide SCSI connector for 16-bit SCSI devices, and 68-Pin Ultra2 SCSI connector for 32-bit SCSI devices. R R III. INSTALLATION Connectors 35 1 68 34 68-pin Ultra2 SCSI Connector 35 1 68 34 68-pin Wide SCSI Connector 1 50-pin Fast SCSI II Connector P2B-L/S/LS Onboard SCSI Connectors IMPORTANT: The 68-pin Wide SCSI Connector is always terminated and will only work as an end device. NOTE: Up to 15 devices can be connected with 50-Pin Fast-SCSI and 68-Pin UltraWide SCSI combined. The onboard Adaptec AIC-7890AB chipset (optional) incorporates an advanced multimode I/O cell that supports both single-ended (SE) and Ultra2 devices. With Ultra2 devices, the SCSI bus platform performs at full Ultra2 speeds (up to 40 MB/sec in 8-bit mode and up to 80 MB/sec in 16-bit mode) and extended cabling 12m (or 25m in a point-to-point configuration). When an SE device is attached, the bus defaults to an SE speed and cable length. In mixed environments of Ultra2 and SE devices, the onboard host adapter can be coupled with the Adaptec AIC-3860 transceiver chipset (optional) to bridge the compatibility gap. By dividing the SCSI bus into independent SE and low voltage differential (LVD) segments, the transceiver chipset supports legacy devices without limiting performance and cable length on the LVD segment. Ultra2 Devices PCI Bus Disk 1 Disk 2 Disk 3 PCI-to-Ultra2 (LVD) Adaptec AIC-7890AB Chipset LVD Mode LS SE Mode Ultra2 SCSI Connector Wide SCSI Connector Adaptec AIC-3860 Chipset Single-Ended Devices CD-ROM Scanner Tape P2B-L/S/LS Mixed Ultra2 and Single-Ended Device Configuration Ultra2 SCSI uses the same connectors and cables as UltraSCSI, so upgrading is easy and cost-effective. 30 ASUS P2B-L/P2B-S/P2B-LS User's Manual