File Name Conventions - ZiLOG Z80-RIO Operating System User's Manual

The user may alter the external initialization bit using
the PROM Debugger GET/SAVE commands (see section 5.13).
See Appendix E for examples. In addition, the user can
alter the initialization procedure by editing the contents
of the file OS.INIT.
After possible redefinition of logical units by the
commands on the external initialization file, the existing
unit definitions are saved as the defaults. Subsequent
unit definitions restoring a unit to its default will
result in the unit definition existing at this point in the
initialization process.
Concluding the bootstrap and initialization procedure, RIO
prints an identifying message, the command prompt character
is sent to the console output unit, and the system waits for
command input.
2.2 FILE NAME CONVENTIONS
In the most general case, file names in RIO consist of
three parts:
1) the device name specifying which device to
search for the named file (e.g. $ZDOS);
2) the drive designation restricting the search
to a particular element of the device (e.g. drive 2);
3) the file name itself.
The file name consists of from one to thirty-two
characters, the first of which must be alphabetic.
Subsequent characters may be alphanumeric ('A' •.. 'Z' or
'0' .•. '9'), or one of the special characters, question mark
('?'), underbar (' I), or period ('.'). Upper and lower
case characters are interpreted as entered, i.e., 'Status'
is not the same as 'status'.
When a period ('.') is used within a file name, those
characters in the name including and following the period
are referred to as a file name 'extension'. For instance,
the file name OS.INIT has the extension '.INIT', while the
file name BOOK.CHAPTER.l has the multiple extensions
'.CHAPTER' and '.1'. The notion of file name extensions is
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