Chilton::ACL::SPROGS Technical Paper

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Applications Associates Literature Society Technology Software revisited

Early history □ Minutes of committee meetings □ Progress reports □ Other reports □ News cuttings □ In-house publications □ Committee papers □ Personal recollections □ ACL publications □ Books □ Early Atlas publications □ FR80 reports □ Atlas manuals □ ICL1906A manuals □ Other manuals and papers

General □ Applications Software Group □ Basic Software Group □ FR80 □ FR80 operations □ FR80 project notes □ FR80 technical notes □ FR80 user notes □ Graphics □ Graphics Section □ Graphics Notes □ Graphics User Notes □ PDP15 □ PDP15 Notes □ SPROGS □ SPROGS Technical Notes □ SPROGS Papers □ SPROGS Notes

SPROGS Technical Paper No 14: Routine Conventions to save lower data

R E Thomas

10 August 1973

The following conventions are now observed by all SPROGS routines to minimise use of 1900 lower data.

(1) All I/O statements reference stream numbers by common variables, declared in SPRG1.

(2) All conversion tables in PLAN routines are in upper storage.

(3) All non-zero real constants are referenced by variables in COMMON block SPRGS5 which has been data initialised.

(4) The constant '0.0' has been replaced by a reference to a COMMON variable whenever it occurs as a routine argument, or in a logical IF statement using .GT. or .LE. In all other cases, 0.0 has been written explicitly, since the compiler does not create extra lower workspace (assignments or other forms of logical IF).

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