2. Getting Started
10
Environmental Requirements
Ziatech recommends vertical mounting for applications in which a fan is not used.
Horizontal mounting requires a minimum air flow of 30 cubic feet/minute passing over
the surface of the board.
INSTALLING THE ZT 8954
If the ZT 8954 is purchased as part of a system, then the system-specific jumpers will
already have been installed at the factory. In general, you should not need to change
the jumpers on the ZT 8954. The ZT 8954 is, by default, set up to drive INTRQ2* (P50)
on the STD 32 backplane, and will use Mode 2 DMA (BUSRQ*/BUSAK*, backplane
control signals) for DOS applications. The default jumper configuration for Ziatech CPU
boards also reflects this configuration.
If the ZT 8954 is purchased as a stand-alone control (for remote mounting of the floppy
drive), then you may need to change the
floppy interface jumpers
to meet the particular
requirements of the floppy disk drive you are using. In particular, older 5¼" drives have
an inverted DENSEL* signal when compared to the 3½" drives. Jumpers W6 and W7 let
you select the sense of this signal. By default, W7 is in; this selects the proper logic
level for DENSEL* for 3½" drives. Refer to the description of
W7
in Appendix A,
"Jumper Configurations," for details.
Interrupt Selection
Jumpers
W12-18
select the backplane pin to which the floppy disk controller interrupt
will be driven. By default, INTRQ2* (backplane pin P50) is used for floppy disk
subsystem interrupts. Other backplane interrupts, as well as STD 32 slot-specific
interrupts, can be selected if the default is not acceptable. The slot-specific interrupt is
configurable for either active low (IXL) or positive edge (IXP).
DMA Mode Selection
The ZT 8954 uses four different modes for floppy DMA transfers (Modes 0-3). The
primary mode of operation is Mode 2, which uses the BUSRQ*/BUSAK* signals for bus
arbitration and uses the backplane control signals (DMAIOW*, DMAIOR*, and T-C) for
the data transfer. Slot-specific DMA and frontplane DMA can also be selected
depending upon the capabilities of the host CPU board. Jumpers
W1 and W2
select the
DMA Mode for the ZT 8954.
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