time. Development software Languages on DRS 20 under DRX included Microsoft BASIC, Micro Focus CIS-COBOL, Pascal, 8085 Assembler, and application building packages including Userbuild and the Demon suite. Languages on DRS 300 Concurrent DOS included Lattice C, CBASIC, Micro Focus Level II COBOL and Digital Research languages including FORTRAN and Pascal. Development software on the Unix-based DRS ranges (300 to 6000) included C, Micro Focus and RM COBOL, EPC C++, FORTRAN and Pascal, and relational databases including Ingres, Informix, Oracle, Sybase and Progress 4GL supplied by Progress Software. During this period, ICL's software strategy was increasingly to make available on its own hardware popular software packages developed by third parties. Almost invariably this involved porting the source code, as there was insufficient compatibility between machines at the binary level. In order to reduce the cost of this activity, and the commercial disadvantage of not having as large a software portfolio as rival vendors, ICL invested strenuous efforts to improve cross-industry compatibility through initiatives such as X/Open. Notes External links The ICL Computer Museum Computer-related introductions in 1981 DRS