A. Board Configuration
ÛZIATECH
86
ZT 8907-Specific SETUP Options
ZT 8907-specific SETUP options, such as interrupt routing and STD 32 memory
addressing, are configurable through screen 2 of the SETUP utility and are discussed
below.
•
Interrupt routing
The source for individual interrupt controller inputs is selectable through screen 2 of
the SETUP utility. The STD 32 backplane interrupts, frontplane interrupts, and PCI
interrupts are options.
•
Backplane DMA (via BUSRQ*/BUSAK*) channel selection
Normally, the BUSRQ*/BUSAK* signals are used to allow DMA to a backplane
based floppy disk controller (for example, ZT 8954), but other devices may use this
mechanism in the absence of a floppy disk controller. Though the SETUP utility
allows either channel 2 (for floppy disks) or channel 5 (for 16-bit operations) to be
selected as the backplane DMA channel, the ZT 8907D does not support DMA
channel 5 on the backplane. Always set the backplane DMA parameter to channel 2
for proper operation.
•
STD 32 memory address decoding
Locations in the lower 1 Mbyte and in extended memory can be dedicated to the
STD 32 bus. Regions that are configured for STD 32 cannot be used for PCI
peripherals. The following regions are selectable:
000C8000h - 000CFFFFh
(This region must be set to STD 32 for STAR
SYSTEM operation.)
†
000D0000h - 000D7FFFh
(This region must be set to PCI for access to the
battery backed static RAM.)
†
000D8000h - 000DFFFFh
JUMPER OPTIONS AND LOCATIONS
The ZT 8907 includes nine jumpers, W1-W9. The default configuration of these jumpers
is shown in the "
Factory Default Jumper Configuration
" figure on the following page.
The "
" figure on the following page provides a blank
jumper layout; use this figure to document your jumper configuration if it differs from the
factory default.
†
Factory default configuration
