DESCRIPTION T h e t h r e e p r o g r a m p a c k a g e s p r e s e n t e d h e r e p r o v i d e a f r a m e w o r k for a p o r t a b l e F o r t r a n s u b r o u t i n e library. T h e y were d e v e l o p e d for t h e Bell L a b o r a t o r i e s l i b r a r y P O R T [1]. T h e p a c k a g e s are: m a c h i n e -d e p e n d e n t c o n s t a n t s , a u t o m a t i c e r r o r handling, a n d d y n a m i c storage a l l o c a t i o n using a stack. T h e r e a r e i n t e r d e p e n d e ncies a m o n g the p a c k a g e s in t h e sense t h a t t h e e r r o r h a n d l i n g is u s e d b y b o t h t h e others, a n d it in t u r n uses m a c h i n e -d e p e n d e n t c o n s t a n t s p r o v i d e d b y t h e first. H o w e v e r , care is t a k e n to a v o i d a n y a c t u a l or a p p a r e n t recursion. T w o n o n -A N S I S t a n d a r d F o r t r a n a s s u m p t i o n s are m a d e in t h e a l g o r i t h m . T h e first is t h a t t h e r e is no r u n t i m e s u b s c r i p t r a n g e checking; t h e s e c o n d is t h a t v a r i a b l e s {local to a s u b p r o g r a m } initialized b y D A T A s t a t e m e n t s , a n d t h e n c h a n g e d w i t h i n t h e s u b p r o g r a m , k e e p t h e i r v a l u e s from one i n v o c a t i o n of t h e s u b p r o g r a m to the next. A p p e n d i x A of [1] discusses n o n s t a n d a r d usage in m o r e detail. REFERENCES 1 Fox, P A., HALL, A.D., AND SCHRYER, N L. The PORT mathematical subroutine library. T h e first p a c k a g e c o n t a i n s t h r e e F o r t r a n f u n c t i o n s u b p r o g r a m s w h i c h can be i n v o k e d to d e t e r m i n e basic m a c h i n e or o p e r a t i n g s y s t e m d e p e n d e n t c o n s t a n t s . V a l u e s are p r o v i d e d in c o m m e n t e d D A T A s t a t e m e n t s for t h e B u r r o u g h s 5700/ Recewed 21 July 1976 and 9 May 1977.General permmslon to make fair use m teaching or research of all or part of this material m granted to individual readers and to nonprofit hbrarms acting for them provided that ACM's copyright notme ]s gwen and that reference is made to the pubhcation, to its date of msue, and to the fact that reprinting prwdeges were granted by permission of the Association for Computing Machinery. To otherwise reprint a figure, table, other substantial excerpt, or the entire work requires specific permission as does republication, or systematm or multiple reproduction.

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