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CHAPTER 2
AMSDOS Primer
This chapter describes AMSDOS, covering all the available
commands and their uses. It details the format of filenames and
provides a reference guide to the commands. Each step is
illustrated by the use of examples.
Subjects covered in this chapter:
• Introduction to AMSDOS
• Disc Directory
• The format of file names
• AMSDOS file headers
• Wild cards
• An example program using AMSDOS Commands
• Reference Guide to AMSDOS Commands
• Manipulating files
• Reference guide to Error Messages
2.1 Introduction.
AMSDOS extends the AMSTRAD BASIC supplied with your CPC464 by the addition
of a number of external commands and by re-defining some of the existing BASIC
commands. The additional external commands are identified by the | (bar) symbol and
are automatically available from ROM when the DDI-1 disc interface is plugged onto
the CPC464.
NOTE that where a string expression is required by an external command it must be
passed a string variable address. See ERA as an example. Note also that it is not
permitted to include the | (bar) symbol in a REM statement.
AMSDOS allows the user to change discs freely, as long as no files are in use -in
which case an error message will be displayed and there could be a loss of data if the
open file was being written to.
Chapter 2.1 AMSTRAD Disc Drive & Interface DDI-1 Manual