Epson Apex 20020, 20040 User Manual page 125

The table below shows the functions for the jumpers on the
memory card.
Memory card jumper settings
Jumper number
1 2 3
A A
B A
B B
A
B
Default setting
l
To access the memory card jumpers, you need to remove the
card from the computer first:
1. Remove the retaining screw from the bracket on the
memory card, as shown below.
Function
640KB *
512KB (disable upper 128KB)
256KB (disable upper 384KB)
Select EPROM size 27128*
Select EPROM size 27256
Installing Option Cards
5-9