Epson 386SX User Manual
Page 151
Slot 5 is designed for an 8-bit option card, and slots 1 through 4
are designed for 16-bit cards. As you can see below, a 16-bit
card has a second connector along the bottom.
8-bit option card
16-bit option card
Usually, it does not matter which slot an option card occupies
as long as the card fits in the slot. For example, you can place
some 8-bit cards in a 16-bit slot. However, you must follow
these guidelines when deciding which slot to
use:
An 8-bit card with an additional connector along the
bottom must go in the 8-bit slot.
If you install an additional disk drive that uses a controller
card, place the card as close as possible to the disk drive it is
controlling.
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.
Installing Options 5-9