Microsoft BASIC Compiler v5.30 19?? Microsoft BDS-C-COMPILER v1.50A 19?? <unknown> Microsoft Fortran-80 Compiler v3.43 19?? Microsoft Microsoft BASIC v5.21 19?? Microsoft Multiplan 1.05 19?? Microsoft TOS 21 v1.81 19?? <unknown> TOS 21 v1.81 (Alt) 19?? <unknown>