Epson 4000 - Manual (Page 55)

External cache jumper settings*
Cache size J25 J26 J27 J28
64KB 1-2 1-2 Off 2-3
128KB 2-3 I 1-2 1-2 1 1-2
256KB 2-3 2-3 2-3 2-3
l
If you have no external cache installed, the position of these jumpers does
not matter.
Processor type jumper settings
Processor type J17 J19
I
486DX/DX2 1-2.3-4 1-2
I
486SX 2-3 Off
I
Setting the Jumpers
If you need to change any jumper settings, follow these steps:
1. Refer to the illustration on page 4-6 to locate the jumpers.
2. If there are any option cards installed in your computer, you
need to remove them to access the jumpers. See page 4-18.
3. A jumper’s setting is determined by where the jumper is
placed on the pins. Use the following table to identify the
pin settings for 2-pin, 3-pin, and 4-pin jumpers. To identify
pin 1, look at the system board under the jumper. You will
see a triangle traced on the board at pin 1.
4-8 Installing and Removing Options