> Does anyone know how to write a QBASIC command to transfer a byte
> or multiple sequence of bytes to the parallel port of a
> PC,  and also to read a byte or multiple sequence of bytes from the parallel
> port?  Also, the same question applies to the serial
> port.  I would appreciate any information on this software question.

> Regards,
> Richard
> rgrazia1@rochester.rr.com

The standard functions are
INP(port)
    where port is a numeric expression between 0 and 65535
inclusive which identifies the port number

usage:  input_data = INP(0x234)

OUT port, data%
    where port is similar to above and data% is an integer
between 0 and 255 inclusive.

usage: OUT  0x567, 100

These functions may not work on a Windows machine, since
direct I/O to ports is not allowed.

The serial functions are
COM(n%) ON
COM(n%) OFF
COM(n%) STOP

n% is the port number (1,2) There are additional functions such
as ON COM and OPEN COM which set up the ports.
Check the documentation for your Basic compiler to see if they
are supported. As above, they may not work under Windows.

John Power

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