Epson Progression U12 - Manual (Page 76)

Although the computer’s power supply is protected against
excessive power loads, you could still damage the main
system board if you install an option card that draws more
power than the limits shown in the table.
This section explains how to install option cards in your
computer. If you need to remove an option card later,
see “Removing an Option Card” on page 3-10 for instructions.
The illustration of the main system board on page 3-3 shows
the six standard option slots inside your computer. You can
install either 8-bit or 16-bit option cards in these slots. As you
can see below, a 16-bit card has an extra connector along the
bottom.
8-bit card
Usually it does not matter which slot an option card occupies,
as long as it fits in the slot. However, you must follow these
guidelines when deciding which slot to use:
You cannot install an 8-bit card that has an additional tab
along the bottom.
Some option cards must be installed in a specific slot.
Consult the instructions that come with the card to see if
this is the case.
If you install a disk drive that uses a controller card, place
the card as close as possible to the drive it is controlling.
Installing and Removing Options 3-7