Roland Vs-880 Owner's Manual download pdf (Page 137)

136

VS-880 Application Guide

More About SCSI

SCSI is a high-speed data transmission buss that is often taken for granted thanks to its common use on

personal computers. However, insufficient attention to SCSI connections have turned out to be the major

cause of “mysterious” or intermittent performance problems users have experienced. Although SCSI has

received a reputation for being voodoo or black magic, most problems may be cured 100% by following

the suggestions outlined below.

The SCSI “Chain”

The SCSI specification allows for up to eight devices (computers, disk drives, etc.) to be “chained” together

on a single SCSI circuit. Cables are connected from one to the next and then the next, etc.; just like making

a chain.

VS-880 Disk drive 0 Disk drive 1 Disk drive 2

The two physical ends of a SCSI chain must be terminated correctly. This also helps reduce reflection on

the bus. Incorrect termination will result in extra “ghost reflections” appearing on the SCSI bus, which can

also corrupt SCSI communications. One end of the SCSI chain is the VS-880. It is internally terminated

already. You must provide proper termination on the other end of your SCSI chain.

Remember: You only add termination to the LAST drive of the external SCSI chain.

SCSI ID Numbers

Each disk or device in a single SCSI chain is identified by its SCSI ID number. This number from 0-7 (eight

devices total) is usually set by a switch on the rear panel of the device.

Each device must be set to a unique SCSI ID number. No two devices can have the

same number. The VS-880 internal computer is set to SCSI ID # 7. Use SCSI # 1-6

for your external devices. (If you have an internal SCSI hard disk drive installed

inside your VS-880, it will most likely be set to SCSI # 0.)

If you cannot find the SCSI ID selector switch, contact your device supplier for instructions to “set the SCSI

ID number”.

SCSI & IDE

The VS-880 actually contains two internal busses for communicating to disk devices - SCSI and IDE.

However, only the SCSI buss is available externally. If you purchased your VS-880 with an internal disk

drive installed, it is most likely an IDE device and is connected to the internal IDE communication buss. It

is simple to identify your internal device.

1. Press the [SYSTEM] button repeatedly until the LCD displays “SYS Drive Select ? “.

2. Press [YES].

3. The LCD will display “SYS Select DRV=IDE:0” if your internal device is connected to the

IDE buss.

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Roland Vs-880 Owner's Manual Page 137