Epson Apex 20020 Manual do Utilizador descarregar pdf (Página 127)

Math coprocessor clock speed. If you install an 80287 math

coprocessor, you may need to set the jumpers for a different

clock speed. The jumpers determine the speed of the

coprocessor.

Since it is easy to damage a math coprocessor, you should

have your Epson Customer Care Center install it for you.

In addition to checking the jumper settings, you also need

to run the Setup program to change the settings in the

CMOS RAM, and y

may want to test the coprocessor

with the System Diagnostics program. See Chapter 2 for

instructions on running Setup. See Appendix C for

instructions on testing the math coprocessor.

The table below shows the functions for the jumpers on the

main circuit board.

Main circuit board jumper settings

Jumper number

Function

1 2 3 4 5

A A

B A

A B

B B

* Default setting

1 wait state for EPROM access *

2 wait states for EPROM access

1 wait state for 16-bit option card *

2 wait states for 16-bit option card

3 wait states for 16-bit option card

4 wait states for 16-bit option card *

Set coprocessor clock at 8 MHz *

Set coprocessor at 1/3 of CPU speed

To access the main circuit board jumpers, you must remove the

memory card from the computer, as described above. Do not try

to access the jumpers while this card is still in the computer.

The locations of jumpers J1-J5 on the main circuit board are

shown in the following illustration. Refer to the table above to

set them as needed.

Installing Option Cards

5-11

1 2 ... 122 123 124 125 126 127 128 129 130 131 132 ... 250 251

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Epson Apex 20020 Manual do Utilizador Página 127