Specifications

Theory of Operation
STD Bus Vectored Interrupts
For more demanding applications, it may be necessary to support each
STD bus interrupt source with a unique vector, as illustrated in Figure
3-3. In this configuration, up to six STD bus interrupting devices can
provide a unique vector for more efficient servicing than is possible
by polling. This number may be decreased if STD DOS is present on
the ZT 8809A.
INTERRUPT
SOURCE 1
ZT 8808A/
ZT 8809A
INTRQ*
INTAK*
INTRQ*
INTAK*
INTRQ*
INTAK*
INTERRUPT
SOURCE 2
INTERRUPT
SOURCE 6
INTRQ*
INTAK*
STD BUS
Figure 3–3. Small Scale Vectored Structure.
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