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NO INPUT FROM EXTERNAL DEVICE TO SIO
1.
Check U 7 -2 0 , the UART Receive Data Line.
If Data is not present here, carefully check
the jumpering of the IJA and/or the IJA Re
ceivers .
If Data is present, check the SIO Configura
tion Jumpers and check all Control Inputs to
the UART U7
PIO PORTS
NO INPUT FROM PIO INPUT PORTS
1.
Check the STB from the external device.
should set /INT low.
2.
Check the jumpering of the PIO
Select.
3.
Check the jumpering of the IJA.
4.
Check the PIO Port enable (/DS1)(DS2).
It is active when the Processor reads the
Port.
this time.
NO OUTPUT TO PIO OUTPUT PORTS
1.
Check the OCDR Line from the external device.
It should set /INT Low.
2.
Check the jumpering of the IJA.
3.
Check the Port Enable (/DS1)(DS2).
It is active when the Processor accesses
the Port.
at this time.
CRI PORT
NO INPUT FROM CRI 1
1.
Check the settings of the recorder and refer
to the CRI Initialization Procedures in the
User Guide.
2.
Check the jumpering 'of the IJA for CRIS.
(especially U7-4, UART Read Enable).
/INT should be reset to a high at
/INT should be reset to a high
Debugging Information
It ■
Strobe
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