OPEN is used to open a file, COM(serial) or LPT(parallel) port.
Syntax 1: OPEN FileName$ FOR Mode AS #FileNumber [LEN = Bytes]
FileName$: as a string file name using the DOS 8.3 naming convention limits.
Modes: Open can use 5 different access modes:
OUTPUT: Creates a new file or erases an existing file for new program output APPEND: Creates a new file or appends program output to existing file BINARY: Creates a new file or uses input and/or output from existing file RANDOM: Creates a new file or uses input and/or output from existing file INPUT : Only reads input from an existing file
FileNumber: as a low Integer number or a value from the FREEFILE function.