- Harwell 1961: Write a Fortran Compiler for Atlas: HARTRAN
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- Write it in Fortran and also a Binary and Arbitrarily Symbolic (BAS) Loader
- Extended Fortran II Compiler, developed on Risley's 7090, producing BAS code for Atlas
- Run HARTRAN through HARTRAN Compiler on the 7090 at Risley generates BAS code for Atlas
- Run HARTRAN through the BAS version on Atlas and you have a new version of the compiler code on Atlas
- Ian Pyle, Barbara Stokoe, Bart Fossey, Paul Bryant, Brian Chapman
- Fortran Libraries
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SHARE: IBM basic algorithms
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QCPE: Quantum Chemistry Program Exchange
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HSL: Harwell Subroutine Library later to become basis of NAG Library
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NP: Nuclear Physics organised by Oxford
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NMR: Nuclear Magnetic Resonance organised by UEA
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WYSEA: Economic Modelling, Imperial
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Graphics: SCFOR, SPROGS, SMOG by ACL
