Appendix A. Board Configuration
85
ZT 8905-Specific SETUP Options
ZT 8905-specific SETUP options, such as interrupt routing and STD 32 memory and I/O 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 absence of a
floppy disk controller. The channel is selectable between channel 2 (for floppy disks) and channel 5
(for 16-bit operations).
•
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†
(Note: This region is required for STAR SYSTEM operation)
000D0000h - 000D7FFFh†
000D8000h - 000DFFFFh†
00800000h - 00FFFFFFh
(8 Mbyte to 16 Mbyte)
01000000h - 03FFFFFFh
(16 Mbyte to 64 Mbyte)
† Indicates the default decoding
•
STD 32 I/O address decoding
Certain regions of the I/O address range can be dedicated to the STD 32 bus. IBM AT-compatible
peripherals normally must be mapped within the 100h-3FFh address range. Most other I/O from
Ziatech is mapped in the E000h-FFFFh range. Regions that are dedicated to the STD 32 bus
cannot be used for PCI peripherals. Most PCI peripherals are configurable for addresses other
than 100h-3FFh, so this should not be a problem. The following regions are configurable for
STD 32 usage:
100h - 1FFh†
200h - 2FFh†
300h - 3FFh†
E000h-FFFFh†
† Indicates the default decoding
JUMPER OPTIONS AND LOCATIONS
The ZT 8905 includes eight jumpers, W1A-W1F, W2, and W3. W1A-W1F are located underneath
the EPROM/FLASH socket (this is the socket used for the alternate boot image). W2 and W3 are
located near the gold fingers and are reserved for factory use only. W2 should always be installed
and W3 removed.
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Содержание ZT 8905
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