Adaptec PCM-3420, PC/104 manual Jumper Configuration Reference, = Terminator Uninstalled

l	Data Transfer Mode	Programmed I/O
l SCSI Floppy/Floptical		Disabled
l	Fast SCSI	Disabled
l	> 1 Gbyte Translation	Disabled

In most cases, you will not need to change these settings.

Jumper Configuration Reference

Nine jumper blocks on the PCM-3420 host adapter are used to config- ure user-selectable options. The following description shows the proper jumper settings for their respective applications.

Jumper Block JP2 :

This jumper is used to set the terminator installed or uninstalled.

JP2*	2-3 Close	= Terminator Installed
JP2	1-2 Close	= Terminator Uninstalled

(* means default setting)

The SCSI bus must be terminated correctly to ensure proper operation of the PCM-3420 host adapter. Terminators must be installed in the first and last devices on the SCSI bus and removed from all other SCSI devices.

Jumper Block JP3 :

This jumper block is used only when DMA is enabled on jumper block JP6 jumper DT (data transfer mode).

Set DMA Channel 0 = D0 & D0 Close (Others Open) Set DMA Channel 5 = D5 & D5 Close (Others Open) Set DMA Channel 6 = D6 & D6 Close (Others Open)

Set DMA Channel 7 = DR & DA Close (Others Open)

You must also select the same interrupt channel with the DC jumpers on jumper block 5.

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