Adaptec PCM-3420, PC/104 manual Adaptec EZ-SCSI

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Adaptec EZ-SCSI

A user-friendly software program that automatically installs SCSI devices such as fixed disks and CD-ROM drives on a PC. Adaptec EZ-SCSI copies the required software programs to the PC’s fixed disk and edits the configuration files so the host adapter can access the devices.

Active Termination

An active terminator actually has one or more voltage regulators to produce the termination voltage, rather than using resistor voltage dividers.

This is a passive terminator:

/\/\/\/

/\/\/\/ GND

SCSI signal

Notice that the termination voltage is varies with the voltage on the TERMPWR line. One voltage divider (two resistors) is used for each SCSI signal.

An active terminator looks more like this (supply filter caps omitted):

4 0 PCM-3420 User's Manual