Description of Resource: 
IBM BASICA (short for "Advanced BASIC") is a disk-based BASIC interpreter written by Microsoft for PC-DOS. BASICA used the ROM-resident code of "IBM Cassette BASIC" which was included with early models of IBM's PC. It added functions such as diskette file access, storing programs on disk, and monophonic music through the PC's built-in speaker. BASICA would not run on non-IBM computers (even so-called "100% compatible" machines) or later IBM models, since those lack the needed ROM BASIC.
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