Section 2. Installing Your PlexCombo
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PlexCombo 20/10/40-12A Installation and Users Manual
Identifying Whether Your System Uses Cable Select
If you are unsure whether or not your system has a Cable Select cable installed,
either look at the cable (there will be connectors labeled “Master” and “Slave”) or
look at the jumpers on the CD-ROM drive. If any device is jumpered as Cable
Select, then both devices on that cable should be jumpered the same.
Locating the Master Position on a Cable Select Cable
With Cable Select, the Master and Slave roles are determined not by jumpers, but by
the connectors on the Cable Select cable. The connectors are identified as Master or
Slave.
Set the DMA Jumper
Your PlexCombo ships from the factory with no DMA jumper installed. (The pins
are empty.) The empty pins mean the drive is set to Ultra DMA. This setting should
work in most cases, so you don’t have to do anything more.
With some personal computers (generally those with older motherboards), the
computer may “hang” or crash with the PlexCombo set to the default Ultra DMA
setting. If this happens, change the PlexCombo to Multiword DMA mode by
installing the DMA jumper across the two pins just to the left of the mode jumper.
Figure 11. Add the DMA Jumper If You Need to Change To Multiword DMA