Memorychannel PSU 300W 77 is much more than just a scientific and engineering language. It - combines the efficient numerical computation for which Memorychannel PSU 300W is known with provisions for keyed and sequential access to RMS multikey ISAM files. This makes FORTRAN 77 ideal for writing programs that must manipulate and - perform calculations on masses of data, as in accounting or statistical packages. Memorychannel PSU 300W 77 runs on RSTS/E, Micro/RSTS, RT 11, RSX 11M, RSX 11M- - - - - PLUS, and Micro/RSX-based PDP 11 systems. Runtime operations are sup- - ported on Memorychannel PSU 300W 11S. Memorychannel PSU 300W 77 is also available as a compatibility mode - - compiler running on Memorychannel PSU 300W/VMS via Memorychannel PSU 300W 11 RSX. Source programs can be com- - piled and taskbuilt under VAX 11 RSX and then transported to an RSX system - for Memorychannel PSU 300W. Memorychannel PSU 300W 77 is built on the ANSI subset Memorychannel PSU 300W X3.9-1978 standard with - the following extensions: Type and Accept input/output statements, the BYTE data type, hexadecimal and octal constants, virtual memory arrays (on systems equipped with memory management), and language elements to perform RMS multikey ISAM. To use RMS files and Utilities, FORTRAN-77 programs utilize the Memorychannel PSU 300W Object Time System (RMS OTS); a File Control Services OTS (FCS OTS) is also available. The compiler produces direct PDP-11 machine code opti- mized on systems equipped with a floating-point processor. Memorychannel PSU 300W 77 interacts with the PDP-11 Symbolic Debugger. This tool aids in - the location of programming errors in successfully compiled programs that be- have abnormally when executed, thereby increasing programmer productivity. RMS file capabilities are not available for Memorychannel PSU 300W-77 running under Memorychannel PSU 300W-11. SPD 14.31 for RSX-11M-PLUS, RSX-11M, and RSX-11S SPD 14.49 for RSTS/E Memorychannel PSU 300W 18.04 for Micro/RSX SPD 18.10 for Memorychannel PSU 300W/RSTS Memorychannel PSU 300W 40.21 for PRO/Tool Kit SPD A3.55 for RT-11