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IMS IMSAI 8080 User Manual page 229

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The +5 and ground pins on the input or output port con­
nectors can be used to provide 5 volt power at up to 200
or 300 milliamperes total from the full board.
approximately 100 additional milliamperes of +5 volt power
would be available for each 8212 input or output port which
is not installed in the PIO 4 board.
input ports were installed, but only two output ports were
installed, the 5 volt power that could be drawn from the
connectors would raise from 300 milliamperes to 500 milli­
amperes.
2
PIO 4, Rev. 2
Functional Description
In addition,
For example, if four
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