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References
- 1 2 3 Lahey, Thomas M., "Tom Lahey's Fortran experiences" Archived 2011-07-09 at the Wayback Machine , from comp.lang.fortran, February 25, 2005.
- ↑ Van Vleck, Tom (ed.). "The Choice of PL/I". - PL/I for the MULTICS project which mentions Digitek's role in writing a PL/I compiler.
- ↑ A programmed operator was a hardware concept on the SDS 900 series of computers similar to the concept of the Atlas computer's "extracodes". The programmed operator calling mechanism allowed computer operation codes to be interpreted by software code. See Scientific Data Systems, "SDS 900 Series", technical manual. Cf. Programmed Operator. Also see "SDS 910 Reference Manual", February 1970. Cf. Appendix E. page A-19, "Programmed Operators" for an in-depth discussion of Programmed Operators.
- ↑ Bell, Gordon, "Computer Structures: Readings and Examples", Section 6: Processors with multiprogramming ability, p.275. "The [SDS] 940 uses a memory map which is almost a subset of that of Atlas but is more modest than that of the IBM 360/67 [Arden et al., 1966] and GE 645 [Dennis, 1965; Daley and Dennis, 1968]. A number of instructions are apparently built in via the programmed operator calling mechanism, based on Atlas extracodes (Chap. 23). The software-defined instructions emphasize the need for hardware features. For example, floating-point arithmetic is needed when several computer-bound programs are run. The SDS 945 is a successor to the 940, with slightly increased capability but at a lower cost."