Appendix A. Board Configuration
† Factory default configuration for DOS systems
87
JUMPER CROSS-REFERENCE TABLE
The following table divides the jumper options into functional groups. Click on any jumper number for
a description of the jumper.
Function
Jumpers
CMOS RAM Erase
W1A,W1B
Boot From On-Board Flash Device
W1C
Reserved
W1D, W1E
Temp Master to ZT 8911
W1F
Reserved
W2, W3
JUMPER DESCRIPTIONS
The following topics list the jumpers in numerical order and provide a detailed description of each
jumper. A dagger (†) indicates the default jumper configuration. Click on the green jumper number at
the top of the topic for an illustration showing jumper locations.
W1A, W1B (CMOS RAM Erase)
W1A, W1B removes the contents of the battery backed CMOS configuration RAM. The CMOS RAM
is erased by turning off the power and moving the W1A shorting jumper to position W1B and back to
W1A again.
W1A
W1B
CMOS Configuration RAM
†
IN
OUT
Normal operation
OUT
IN
Erase
W1C (Boot From On-Board Flash Device)
W1C enables the ZT 8905 to begin program execution from the local Flash device or an alternate
boot image loaded in the socket at T6C. Select the alternate boot operation if the local Flash device
is corrupted and the ZT 8905 fails to boot properly. W1C must be removed when booting from a
device in socket T6C.
W1C
Boot Source
†
IN
Local Flash memory
OUT
Alternate boot image in socket at T6C
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Содержание ZT 8905
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