2 hardware configuration, 1 factory default configuration, 2 enable scratchpad register (spad, j2) – Quatech Asynchronous Communications Adapter QSCLP-100 User Manual

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2 Hardware Configuration

The QSCLP-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-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 QSCLP-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

X2

X4

X8

J2

J3

J4

J5

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

X2

X4

X8

J2

J3

J4

J5

Figure 3 --- Enable scratchpad registers

2.3 Force High-Speed UART Clock (X2, X4, or X8, J3-J5)

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QSCLP-100 User's Manual

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