Acorn System Software

System BASIC

This is a 4K byte program which interprets the popular BASIC programming language. Acorn's interpreter uses 32 bit integers to provide a numeric range of ± 2,000,000,000, and has additional instructions specifically aimed for manipulating real machine addresses. The interpreter requires an Acorn Operating System for handling keyboard and VDU and can typically process 500 statements per second.

System BASIC Floating Point Extension

This is an additional 4K byte program which adds 9 digit floating point manipulation to the repertoire of the integer BASIC interpreter. Also included are scientific function and plot routines for the VDU.

ONLI Extension

This is an additional 2K byte program which adds statements to BASIC allowing the control of experiments in real time. Designed to operate with laboratory interface the state of each output or input is easily controlled and timed using the 10mS clock interrupt.

System 1 Monitor

This is a 512-byte program which provides allows the entry and running of programs via the keyboard and isplay of an Acorn System 1, it also contains routines for saving and loading programs from the cassette interface.

Cassette Operating System (COS)

This is a 2K byte program providing support for other programs by dealing with peripherals and allowing programs to be filed on cassette tape. It supports Acorn's teletext VDU, a parallel ASCII keyboard and a Centronics style parallel printer via a VIB.

Disk Operating System (DOS)

This is a 4K byte program providing support for other programs by dealing with peripherals and allowing programs to be filed on mini-floppy disks. It supports Acorn's teletext VDU, a parallel ASCII keyboard and a Centronics style parallel printer via a VIB. The mini-floppy is Acorn's single density single-sided drive with controller, giving the user 100K bytes of file space. A second mini-floppy drive can be added.

Network Operating System (NOS)

This is a 4K byte program providing support for other programs by dealing with peripherals and allowing programs to be filed on the Econet Network. It supports Acorn's teletext VDU, a parallel ASCII keyboard and a Centronics style parallel printer via a VIB.

Assembler/Disassembler/Editor (ADE)

This is a 4K byte program for assembling machine code programs. It comprises 3 distinct parts: 1) a full symbolic 2 pass assembler 2) a symbolic disassembler 3) a text file editor The ADE requires an Acorn Operating System for handling keyboard and VDU.

LISP

This is a 6K byte interpreter plus an initialised workspace for this famous list processing language. The interpreter requires an Acorn Operating System for handling keyboard and VDU.

Screen Editor

This is a 2½K byte program for creating and editing plain text with an integral justifier which is available in a micro-space version for Daisy Wheel printers.

Pascal

The Acorn implementation of Pascal is designed to provide a fast and powerful alternative to Basic on all our systems. Pascal is a modern programming language which allows and encourages the use of structured programming methods which in turn allow programs to be developed and in particular maintained much more efficiently than is possible with older languages.

The Acorn Pascal system includes, in addition to the compiler, an editor which also acts as the user interface to the other programs in the system, an interpreter for the compiler generated intermediate code, and an in-line assembler for programming critical or "close-to-the-machine" routines.

The compilers in current systems are restricted to a subset of standard Pascal so that the whole system can be resident in memory for fastest program development, but the subset includes all the most used features of the language, the main items sacrificed being the most advanced data structures. Extensions are included to provide full access to graphics and operating system facilities.

Versions of the system are available for both disk and ROM.

Summary of specification

Compiler

The Pascal subset supported includes:

·         integer (16 bit), character, boolean, and floating point (40 bit) data types

·         all the executable statements of standard Pascal

·         procedures and functions with parameters and local variables

·         arithmetic, logical and relational operators

·         library functions and procedures

·         arrays and text files

·         in-line mnemonic assembler

·         built-in graphics and interface to the operating system

Editor

Commands include:

·         forward and backward search

·         delete, insert and modify lines

·         save and load text and object code

·         compile text and execute object code

Software is also available from Acorn for interfacing the following devices:

1.       Serial terminals e.g. 20mA Teletypes and RS232C devices

2.       Modems and in particular the GPO Prestel system

3.       PROM programmer for fusible link and UV erasable devices

4.       Daisy Wheel printers i.e. RP1600

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