A. Board Configuration
ÛZIATECH
90
W3 (CMOS RAM Erase)
W3 clears the contents of the battery backed CMOS configuration RAM. The CMOS
RAM is erased by removing the card from the backplane or other power source and
moving the W3B jumper to position W3A and back to W3B again.
W3A
W3B Function
In
Out
Erase CMOS
Out
In
Normal
W4 (SRAM Battery Backup)
Installing W4A battery backs the SRAM installed in socket U17. Always install W4A if
SRAM is installed in U17. Installing W4B may increase battery drain when SRAM is
installed.
Note:
In no case should W4 be totally unjumpered.
W4A
W4B Function
†
In
Out
SRAM is battery backed
Out
In
SRAM is not battery backed. Use this configuration
only when no SRAM is installed in socket U17.
W5 (Local Keyboard Disable)
If W5 is not installed, the ZT 8907's on-board keyboard controller is enabled (and
available through connector J7). Installing W5 (default configuration) disables the local
keyboard controller on the ZT 8907. W5 must be installed when using a keyboard
controller located on the backplane.
W5
Function
†
In
STD keyboard enabled
Out
Local keyboard enabled
†
Factory default configuration