- Two Channel Low Profile RS-232 Asynchronous Communications Adapter User Manual

2 Hardware Configuration

The DSCLP-100 is automatically configured at boot time by the computer's

BIOS or operating system. There are no required switches or jumpers to set for

installation.

This chapter lists a number of optional jumper settings that control various

hardware features. Jumpers J2, J4-J5 are grouped together at the end of the board

opposite the HD-44 connector. Any changes from the factory default should be made

before installing the DSCLP-100 in the computer.

2.1 Factory Default Configuration

Figure 2 shows the jumper configuration as shipped from the factory, with two

spare jumpers applied in neutral positions. Remove one or both and apply as shown in

following sections to set optional features.

SPAD

Figure 2 --- Factory default jumper configuration

2.2 Enable Scratchpad Register (SPAD, J2)

In the default configuration, an Interrupt Status Register and an Options Register

(see page 0) replace the scratchpad (base address + 7) of each UART. If the SPAD

jumper is applied as in Figure 3, the UART scratchpad registers are enabled, and the

Interrupt Status Register and the Options Register are not available.

SPAD

Figure 3 --- Enable scratchpad registers

2.3 Force High-Speed UART Clock (X2 or X4, J4-J5)

2 DSCLP/SSCLP-100 User's Manual