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Algol Language □ Algol Library □ Atlas Autocode □ ABL (Atlas Basic Language) □ ABL exercises □ Atlas Supervisor □ Atlas 1 Extracodes □ Atlas 1 Operators □ Atlas 1 Preparing a program □ Atlas 1 Supervisor and Fixed Store routines □ Atlas 1 Supervisor Vol 1 □ Atlas 1 Supervisor Vol 2 □ Atlas 1 Supervisor Vol 3 □ Atlas 1 Features: Early Ferranti paper □ Atlas Testing □ Input/Output for Atlas 1 and 2 □ Atlas Computer: Ferranti Overview □ Atlas Bible □ Atlas 2 Supervisor

Further reading □ Contents □ Introduction □ 0. Introductory exercises □ 1. Basic operations □ 2. Modification, counting and testing □ 3. B-register operations □ 4. Accumulator operations □ 5. Extracode functions □ 6. Input and output operations □ 7. Magnetic tape operations □ 8. Advanced programming techniques □ 9. Complete programs

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⟶ ACL ⟶ Literature ⟶ Atlas manuals ⟶ ABL Exercises :: ATLAS 1 COMPUTER ABL PROGRAMMING EXERCISES

⟶ ACL ⟶ Literature ⟶ Atlas manuals ⟶ ABL Exercises :: ATLAS 1 COMPUTER ABL PROGRAMMING EXERCISES

ACL ACD C&A INF CCD CISD Archives

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

Algol Language □ Algol Library □ Atlas Autocode □ ABL (Atlas Basic Language) □ ABL exercises □ Atlas Supervisor □ Atlas 1 Extracodes □ Atlas 1 Operators □ Atlas 1 Preparing a program □ Atlas 1 Supervisor and Fixed Store routines □ Atlas 1 Supervisor Vol 1 □ Atlas 1 Supervisor Vol 2 □ Atlas 1 Supervisor Vol 3 □ Atlas 1 Features: Early Ferranti paper □ Atlas Testing □ Input/Output for Atlas 1 and 2 □ Atlas Computer: Ferranti Overview □ Atlas Bible □ Atlas 2 Supervisor

The I.C.T. ATLAS 1 COMPUTER ABL PROGRAMMING EXAMPLES

CS 349b, April 1966

INTRODUCTION

These exercises in Atlas Basic Language (ABL) are intended to be used in conjunction with the Atlas 1 Programming Manual, the current version of which is document CS 348A. The relevant chapter of the latter manual is indicated at the beginning of each set of examples.

Solutions are given to all the examples. In some cases alternative solutions are presented to illustrate a particular technique. There is generally more than one possible solution to a given exercise and the solutions provided are, therefore, to be regarded only as guides. The reader should, of course, attempt to complete a solution of his own before referring to those given.

Most of the exercises are short pieces of programming and should prove useful as parts of much larger computations, There are, however, examples of complete programs which illustrate the more comprehensive requirements in running a problem on Atlas. Flow diagrams are given in the solution of some of the more complex problems.

NOTES ON SOLUTIONS

All working space used in the store must be addressed. The contents of an address are denoted by enclosing the address in round brackets, Thus

(11.4): refers to the contents of address 11.4
b1: refers to the contents of B1

The contents of an address after the performance of an instruction is indicated by an apostrophe. Thus the action of the instruction

    113    4     0     11.4

is denoted by

(11.4)' = b4

Similarly

    121   12  0   3

is denoted symbolically by

b12' = 3

All examples are independent unless specifically stated otherwise.

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