80-Bus News

  

January–March 1982, Volume 1, Issue 1











Page 10 of 55











note erenr

10

Edit and Ecmd These overlay files control the EDIT command, enabling seperate source and destination files to be given as parameters. The editor supports a wide range of functions and acts as a window on the text. Commands are available for moving/inserting/deleting/finding-changing portions of text in a most powerful way. The files created are suitable for submitting to the assembler or BASIC or as just text files. The Edit overlay may also be called by a user’s program for specialised applications. A seperate utility program is available called Polytext for formatting and print time adjustment of letters and documents.

FORMAT The format utility programmme is used for the first time initialisation of blank diskettes. It allows disks to be formatted in single density or double density in the case of a G815/G809 system with automatic verify to check the data can be read back. Diskettes may also just be verified if required.

BACKUP This utility program is used to make direct image copies of diskettes as the name implies, it can also be used on a single drive system allowing the user to place the source disk in the drive which is then read, the user is then prompted to pkace the destination disk in the drive and the data is then transferred.

SZAP This very powerful program allows you to dive straight into the disk and display the data held there. This is not for the faint hearted since the data can be directly modified on the disk, thus a few careless key presses could result in loss of directory information and render the data useless.

When "BASIC" is typed in the command line mode, a file called "BSdr.BR" is loaded which holds the routines for the Disk BASIC, control is then passed to the ROM BASIC. The BASIC under Polydos is an enhanced version of the Nascom BASIC allowing such features as:

Direct mode commands.

LOAD Load a BASIC program file from disk

SAVE Save a BASIC file to the disk in memory image format SAVET Save a BASIC file in ASCII text format

EXEC Load and RUN a BASIC program file

AUTO Automatic line numbering

REN Line renumbering

FIND Find a string

Program/direct mode commands.

SETNEW Open disk data file, random or sequential access are available SETINP Input data from a disk file

SETOUT Output data to a disk file

SETPOS Set file position pointer in random access mode

SETCLS Close a disk file

SETLOAD Load a file into memory (typically machine code subroutines) SETCHAIN Load and RUN a BASIC program and leave variables untouched SETPRON Echo output to the printer

SETPROFF Turn off the above option

SETERR Trap program errors

SETREAD Input string variable with editing facilites

SETCLEAR Define string space and memory size


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