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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 Paper No 28: Picture File Library Additions

A H Francis

December 5 1972

This paper contains some additions and corrections to SPROGS Paper 26.

As well as the display routines defined in Paper No 26, there will be two others. DYLIST(N) will list the directory of the library on channel N. It will not cause the backing store pointers to be entered into the filetable.

There will also be a routine called ERSFIL('FRAME',N) which will erase the directory entry to the file FNAME in the library on channel N. This routine will also search the filetable and erase the backing store pointer if an entry exists for this file. Initially, there will be no garbage collection, this may be added later.

Updating of the libraries and filling up empty gaps cannot take place during a SPROGS run since the filetable backing store pointers would not then be correct. A separate program will thus be used to update the libraries.

The hash table for the library directories will have 128 entry points, ie, every entry may be accessed directly.

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