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A. JUMPER CONFIGURATIONS
The ZT 8904 includes several options that tailor the operation of the board to
requirements of specific applications. Options are made by installing and removing
shorting receptacles (jumpers).
JUMPER OPTIONS
The ZT 8904 includes jumpers with two posts and jumpers with three posts. Jumpers
having only two posts are labeled Wx, where x defines the jumper number (for example,
W12). Jumpers having three posts are labeled Wx "a" and "b" (for example, W16a and
W16b). These jumpers have two possible selections, where "a" is one selection and "b"
is another.
Jumper locations are illustrated in the "
Customer Jumper Configuration
" figure following;
use this figure to document your jumper configuration if it differs from the factory default.
The "
DOS Factory Default Configuration
" figure illustrates the factory default jumper
configuration for ZT 8904 boards purchased in a DOS system.
The "Jumper Cross Reference" table below divides the jumper options into functional
groups.
Jumper Cross Reference
Function
Jumpers
CMOS RAM
W16
CPU Configuration
W24-27
DRQ1 Source Selection
W23
Maskable Interrupts
W17-22
Non-Maskable Interrupts
W9-11
Numeric Coprocessor
W8
Reserved
W1-7
RS-485 Duplex Selection
W12-15
RS-485 Transmitter Configuration
W28-31
