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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