Appendix A. Board Configuration
† Factory default configuration for DOS systems
88
W1D (Reserved)
Reserved. This jumper must be left installed.
W1E (Reserved)
Reserved. This jumper must be left installed.
W1F (Temporary Master to ZT 8911)
When the ZT 8905 is used in a STAR SYSTEM that has the ZT 8911 as the Permanent Master,
jumper W1F must be installed. W1F controls the backplane environment to let the ZT 8911 perform
system translation cycles between the ZT 8905 and SA/EA peripherals. See the "Multiple Master
System Requirements" section in Chapter 3 for more information on operating the ZT 8905 in a
multiple master architecture.
W1F
Temporary Master Type
IN
Enabled
†
OUT
Disabled
W2, W3 (Reserved)
W2 should always be installed and W3 removed (factory default).
CUTTABLE TRACE OPTIONS AND LOCATIONS
The ZT 8905 supports the option of assigning up to two additional DMA channels for frontplane
operation with the addition or removal of two 0 ohm surface mount resistors, CT1 and CT2. These
are factory-installed options only.
A "Cuttable Trace Locations" figure and a detailed description of CT1 and CT2 are provided on the
following page. A dagger (†) indicates the default configuration.
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Содержание ZT 8905
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