System tracks:

Tracks reserved on the disc for the CP/M system.

TPA:

Transient Program Area. An area in memory commencing at 0100Hex where CP/M user programs run and store data.

Track:

Tracks are concentric rings on a disc. Each track holds a fixed number of sectors. The tracks and sectors are written to a specific area of a disc during formatting.

Transient program:

A CP/M utility program such as FILECOPY which can be loaded into the TPA and run by typing its name at the keyboard.

Turnkey:

A word used to describe a program which executes automatically when the system is booted. The Dr. Logo disc is an example of a turnkey program.

Turtle:

A graphic symbol, in the shape of an arrow head, that functions as a graphic cursor on the Dr. Logo graphic screen.

Turtle graphics:

The graphics image left on the screen by the movement of a turtle. As the turtle moves it leaves a trace of its path on the screen.

Turtle step:

The smallest distance a turtle can move. Normally one pixel.

Utility program:

A program on disc that enables the user to perform certain operations. See transient program.

Warm start:

This is performed when [CTRL]C is pressed during CP/M. A warm start reinitialises the disc subsystem and returns control to CP/M ready for commands to be entered.

Wildcard character:

Either of the characters * or ?. Dr. Logo only supports the ? character. The * wildcard simply means any number of ?s. When referencing files wildcard characters are used to make up an ambiguous file name. Any ? s in the file name refer to any numeric or alphabetic character.

Write Protection:

A safeguard used to prevent re-writing of a disc or disc file. A write protected disc or file is Read Only.

Appendix 1. 5

AMSTRAD Disc Drive & Interface DDI-1 Manual

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Amstrad DDI-1 manual Tpa