About the Main Logic Board Jumpers

The jumpers on the main logic board have the following functions:

• J2604 and J2605 are used to configure the serial ports for either EIA-423 or EIA-232D operation. For information about the EIA-423/232D jumper settings, see "About Serial Port Jumpers".

• J2702, J2704, and J2804 are used to affect the operation of the flash PROM located on the main logic board. For information about the flash PROM jumper settings, see "About Flash PROM Jumpers".

The illustration below shows the jumper locations on the main logic board.

Figure 5-10  

Jumpers are marked on the main logic board with identification numbers. For example, the serial port jumpers are marked J2604 and J2605. Jumper pins are located immediately adjacent to the identification number. Pin 1 is marked with an asterisk (*) in any of the positions shown below.