2. Basics

2.1 Definition of terms

Table 2.1 defines the terms used in the description of file system libraries.

Table 2.1 Definition of terms

term	meaning
cd buffer	A buffer that stores data read from a CD in sectors. Fa. It has a capacity of 200 sectors.
DOS file	on an IBM-PC accessible via SCSI interface File. Can be used with debugging libraries.
memory file	File placed on SIMM. Debugging library Available in
access pointer	Location (unit: sector) to access the file.
current directory	Directory referenced when opening a file.
debug file	A generic term for DOS files and memory files.
buffer compartment	A partition of the CD buffer into multiple logical partitions. One buffer area per open file The image will be exclusive.
file identifier	Sequential number within the directory to identify the file. Takes a value from 0 to (number of directory records - 1). Ta where 0 indicates your directory and 1 indicates the parent directory. To do.
frame address (FAD)	The absolute time on the CD, 00:00:00, is set to 0, and it is linked frame by frame. Sequentially numbered. corresponds one-to-one with absolute time. vinegar. For CDs, frame addresses are used instead of absolute times. access as a key.
Main processing	A series of processes starting from resetting the CPU. For interrupt handling It is a term for
Interrupt handling	A process triggered by an interrupt. for main processing It's a term.

2.2 Notation

This section explains the notation used to explain file systems.

(1) Grouping names

ABC_~ means that there are several names starting with ABC_. For example, ABC_X, ABC_Y, ABC_Z.

(2) Symbol specification

!MMM/SSS, represents the symbol SSS defined in module MMM. This is also the notation used in E7000 commands.

(3) Hexadecimal notation

A number with an "H" after it means it is a hexadecimal number.

2.3 Name restrictions

The file system library uses the following names as function names, variable names, type names, and macro names.

Function name, variable name	GF~ and gf~
Model name	Gf~
macro name	GF~

Applications using this library must be careful not to conflict with these names.

2.4 Access Macro

In CD libraries, including file system libraries, structure members are referenced using macros called "access macros." Access macros can also retrieve and set member values.
Using access macros provides the following advantages:

• The access format to members can be unified.
• It becomes easy to extract parts that access specific structure members.