ALGOL 68S is aprogramming language designed as a subset ofALGOL 68, to allow compiling via aone-pass compiler.^[1] It was mostly fornumerical analysis.

A compiler for ALGOL 68S was available for thePDP-11, written in the languageBLISS. The multiprocessor version designed for theC.mmp has been preserved at the PDP Unix Preservation Society archive.^[2]

Charles H. Lindsey created another implementation of ALGOL 68, named ALGOL 68S, forSun-3, SunSPARC (underSunOS 4.1), Sun SPARC (underSolaris 2),Atari ST (underGEMDOS) andAcorn Archimedes (underRISC OS).

The main differences between ALGOL 68 and 68S, as summarised from Appendix 4 of the Informal Introduction,^[3] include:

• Nounion
• Noflex, butstrings are handled specially
• No arrays inside structures (but references to arrays were allowed) and a similar restriction on arrays of arrays (multidimensional arrays are nonetheless permitted)
• Limits on use oflong andshort to aid implementing on small computers
• Noheap
• Noparallel processing
• Limits on the order of declaration and other small syntactic differences to allow one-pass compiling
• Noformats

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