Adaptec PC/104 - Manual (Page 18)

1 2 PCM-3420 User's Manual
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.