QBasic 1.1: INP Function

Explanation

INP returns a byte read from a hardware I/O port. OUT sends a byte to a hardware I/O port.

Useful and cross-version information about the programming environments of QBasic, QuickBasic and Visual Basic for DOS.

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INP(port%)

OUT port%, data%

port%	A number in the range 0 through 65,535 that identifies the port.
data%	A numeric expression in the range 0 through 255 to send to the port.


x% = INP(&H3FC)          'Read COM1 Modem Control Register.
OUT &H3FC, (x% XOR 1)    'Change Data Terminal Ready bit.