Specifications

Theory of Operation
STD BUS AND LOCAL CONTROL PORTS
The STD bus and local control ports increase the control and
flexibility of the communication link between the STD bus and the
ZT 8832.
STD Bus Control Port
Overview
The STD bus control port is an I/O mapped device programmed by
the STD bus CPU to perform the following operations.
• Generate maskable and non-maskable interrupts
• Lock dual port access
• Reset the maskable interrupt generated by the local CPU
• Reset the ZT 8832
The STD bus CPU control port does not have readback capabilities
and is not accessible by the local CPU.
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