1. Introduction

This document describes the external specifications of the script syntax for the CD builder "XBLD" for Sega Saturn.
This script complies with the following standards. Please refer to each standard for detailed description information.

physical format	...CD standard (RED BOOK, YELLOW BOOK), CD-ROM XA standard
logical format	...ISO9660 standard, CD-ROM XA standard
MPEG format	...ISO11172 standard
saturn format	...SEGA Saturn DISC format standard specifications

1.1 Features

Compatible with the Sega Saturn disc format, it has the following features:

(1) Physical format

Compatible with CD-ROM and CD-ROM XA standards.
The CD-ROM XA standard corresponds to a format called "SEMIXA".
(In SEMIXA format, the first track is MODE1, and the second and subsequent tracks are MODE2.)

(2) Logical file format

It complies with the ISO9660 standard and also supports expansion with the CD-ROM XA standard.

(3) Interleaving compatible

Various interleaving structures can be described that correspond to file numbers and channel numbers.

(4) MPEG compatible

It supports MPEG system layer streams, MPEG video, and MPEG audio streams that comply with the ISO11172 standard.

1.2 Basics

(1) Command line format

A script is a collection of command lines that specify the arrangement of data on a CD.
A command line consists of a keyword followed by zero or more parameters.
Keywords and parameters are separated by one or more whitespace characters (spaces or tabs).
Also, keywords are not case sensitive.

┌────────────────────────────────┐
│Keyword Parameter1 Parameter2 … │
└────────────────────────────────┘

(2) Comments

Anything from the semicolon (;) to the end of the line is treated as a comment.
However, in order to distinguish it from the semicolon that precedes the version number of the ISO file name, one or more blank characters shall be placed. (excluding the semicolon at the beginning of the line)

" example "

File SAMPLE;1	← "1" is interpreted as a file version number.
File SAMPLE ;1	← "1" is interpreted as a comment.

1.3 Definition of terms

The following terms are used in this document.

ISO file

Files on ISO9660 disk image

DOS file

Files on DOS used for build

file source

DOS file that is the input source for the ISO file

file attributes

Attributes of files on disk images

directory attributes

Attributes of a file or directory recorded in a directory record

source attribute

File source attributes

extent

Shows a range of contiguous sectors on a disk.
A sector arrangement made up of multiple interleaved files.

null data

Data consisting of binary zeros (00H).

empty sector

A sector whose user data area consists of null data.

volume descriptor track

First track of the session. In addition to the normal file itself, file logical structures such as volume descriptors, path tables, and directory records are recorded.

Date Time

Write in the format DD/MM/YYYY hh:mm:ss:cc:gg.

DD/MM/YYYY	…day/month/year
hh:mm:ss:cc:gg	…Hour: Minute: Second: 1/100th of a second: GMT time difference

GMT time difference is the time difference (in 15 minute units) from Greenwich Mean Time.
In Japan, it is 36.

relative time

Indicates the location of files and extents.
Describe the position from the beginning of the session, extent, file, etc. in FAD or time format.

Number of sectors	...FAD format
mm:ss:ff	…Time format (mm: minutes, ss: seconds, ff: frames)