Define handshaking signals in 8255 mode 1
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When performing handshaking, some signals are automatically reserved for control purposes and are unavailable for use.
The control signals used depend on the ports you are using and whether you are handshaking with input or output channels.
The remaining lines in the port not used for control are still available for use.
The control signals used depend on the ports you are using and whether you are handshaking with input or output channels.
The remaining lines in the port not used for control are still available for use.
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