Amstrad DDI-1 manual Primitives

Page zero:

This refers to the region of memory in a CP/M environment between 0000Hex and 0100Hex that is used to hold vital system parameters.

Physical device:

An actual device, consisting of hardware, that exists. Physical devices may be represented by logical devices.

Primitives:

Procedures, operations or commands that make up Dr. Logo; the built-in procedures.

Procedure:

A series of expressions or program statements that dictate how to perform a particular task.

Prompt:

A short message or character sequence reminding the user that some type of input is expected. For example, the CP/M prompt is the > and the Dr. Logo prompt is the ? character.

Random access:

The ability to read and write information in memory or on a disc in any desired order.

Read only R/O:

An attribute assigned to a disc, a disc file or a disc drive that prevents writing or changing of data.

Read write R/W:

An attribute assigned to a disc, a disc file or a disc drive that allows both reading and writing of data.

Record:

A group of bytes in a file. CP/M uses 128 byte records.

Sector:

A block of data on a disc. The AMSTRAD disc system uses a sector size of 512 bytes.

Single sided:

Refers to a disc which has only one side available for data storage.

AMSTRAD Disc Drive & Interface DDI-1 Manual Appendix 1.4