Epson 20 - Page 123

SPF card jumper settings for serial port
Jumper number
Function
5
6
9
A
A
A Built-in port is primary *
A
B B
Built-in port is secondary
B
Disable built-in port **
* default setting
* * the setting of jumpers 6 and 9 do not matter
SPF card jumper settings for parallel port
Jumper number
Function
3
4 10
A A A
Built-in port is primary *
A
B B
Built-in port is secondary
B
A A
Enable compatibility with IBM monochrome
display/printer adapter
B B
Disable built-in port **
* default setting
** the setting of jumper 10 does not matter
To access the SPF card jumpers, you need to remove the card from
the computer. If you have a hard disk drive controller card in slot 7
or 8, you must remove it before you can remove the SPF card because
of the cables. Follow the instructions below, in the order listed here,
as necessary for your system:
l Remove the hard disk drive controller card (if you have one)
l Remove the SPF card
l Change the jumper settings
l Replace the SPF card
l Replace the disk drive controller card (if necessary).
Installing Options 6-11