2. Basics

2.1 Package composition

The XBLD package consists of the following files.

Table 2.1 XBLD package configuration file

File	explanation
XBLD.EXE	DOS extender version of XBLD (works in MS-DOS environment)
XBLD32.EXE	32-bit version of XBLD (operates only in Windows95 DOS window environment)
SAMPLE.SCR	sample script file
SAMPLE.BLD	Sample subcommand file
MANXBLD.TXT	CD Builder XBLD external specifications

2.2 Operating environment

This system operates in a DOS environment on IBM-PC.
The required hardware and software are shown below.

Table 2.2 Operating environment

Item		Operating conditions/model etc.
		XBLD	XBLD32
hardware
	IBM-PC compatible machine	80486/33MHz or higher
	memory	8MB or more
	hard disk	600Mbyte or more (VCD recommended model)
	CD-R drive *1	YAMAHA CDE100/CDE102
	SCSI I/F board *1	adaptec SCSI MASTER (recommended)
	VCD I/F board *2	I/F board for CD emulation
software
	OS	MS-DOS Windows95 (DOS window)	Windows95 (DOS window)
	DOS extender	DOS/4GW DOS Extender	Unnecessary
	driver	ASPI driver *1
	Other tools	Write-once system *1 (ADDCDW), VCD emulator *2 (VCDEMU), etc.

*1

When writing to a CD-R disc, hardware and software such as a CD-R drive, SCSI I/F board, ASPI driver, and write-once system are required.

*2

To perform CD emulation, related hardware and software such as a VCD I/F board and VCD emulator are required.

2.3 Input/output files

(1) Input file

When creating a CD or performing CD emulation, specify it as an input file for XBLD.

Table 2.3 XBLD input files

SCR file		script file
	file name	scrfile.scr
	explanation	Specifies how program data is arranged on the CD. (Script syntax is the same as VCDBUILD)

(2) Output file

XBLD outputs files as follows depending on the operating mode.

Table 2.4 XBLD operating modes and output files

XBLD operating mode	subcommand	output file
CD creation	unspecified	DSK, TOC
real-time emulation	r	DSK, TOC, RTI
Direct DOS file access	p	PVD, TOC, RTI, QSB
write on the fly	otf	PVD, TOC, SCT, OTI

Table 2.5 XBLD output files

DSK file		Disc image (CD image)
	file name	dskbase.dsk (specified with the Disc command in the script file)
	Output destination	Path specified in the script file's Disc command
	size	Several Mbytes to 600 Mbytes (file size same as the created CD)
	explanation	Create a CD (write to CD-R) or use CD emulation A file that is an image of the CD required to perform the operation.

TOC file		TOC information file
	file name	dskbase.toc (DSK file base name + extension TOC)
	Output destination	Output to the same location as the DSK file
	size	(Total number of indexes + 2)×8 bytes
	explanation	A file containing track information. Used when creating a CD.

RTI file		CD configuration information file
	file name	dskbase.rti (DSK file base name + extension RTI)
	Output destination	Output to the same location as the DSK file
	size	Several 10 bytes to several 10 Kbytes
	explanation	Analyzes the SCR file and outputs CD configuration information as an RTI file. CD emulation (real-time emulation, direct DOS) Used when performing file access).

PVD file
	file name	pvdfile.pvd (Specified with the PrimariyVolume command in the script file)
	Output destination	Path specified in the PrimariyVolume command in the script file
	size	Several 10 Kbytes to several 100 Kbytes
	explanation	A file that records the contents of a PVD (basic volume descriptor). When performing CD emulation with direct DOS file access, It is also used when writing on the fly.

QSB file
	file name	vcd0000.qsb~vcd9999.qsb
	Output destination	Output to the same location as the DSK file
	size	CDDA source file sector count x 98 bytes
	explanation	A file that records CDDA track information. CD emulation with direct DOS file access Use when doing.

SCT file
	file name	dskbase.sct (DSK file base name + extension TOC)
	Output destination	Output to the same location as the DSK file
	size	(Number of DOS files + number of gaps) x 28 bytes
	explanation	This is an XBLD specific file. Used when writing on the fly, A file that records disk sector information.

OTI file
	file name	xbld0000.oti～xbld9999.oti
	Output destination	Output to the same location as the DSK file
	size	Several 100 Kbytes to several 10 Mbytes (interleaved file size)
	explanation	This is an XBLD specific file. Used when writing on the fly, Interleaved intermediate file.

2.4 Definition of terms

Defines basic terms used in this system.

subcommand

Instructions for XBLD.
Specify a subcommand as an XBLD command option.

subcommand file

A file that describes a group of subcommands. Specify subcommands by file instead of command options.

DOS window

Refers to a Windows MS-DOS window. XBLD32, a 32-bit version of XBLD, operates only on Windows95 DOS windows.

DOS extender

Basic software for using protected mode from MS-DOS.
A typical DOS extender is DOS/4GW.

CD builder

A tool for creating disk image files.
CD builders for Sega Saturn include XBLD and VCDBUILD.

DSK file (disk image)

A file constructed from a CD image required for CD creation or CD emulation.

TOC file

A file containing track information.
Used when creating a CD.

ISO file

A file recorded on an ISO9660 standard CD.

DOS file (source file)

MS-DOS file from which a disk image is created.

ISO9660 standard

A standard that specifies the logical format of CD-ROMs.

ISO11172 standard

MPEG-1 standard. In addition to MPEG video and MPEG audio, it includes system standards that handle their synchronization and multiplexing.

ISO11172 stream

Refers to multiplexing MPEG video and MPEG audio.

Write Once System (CD-R writing software)

Software that writes to CD-R discs.
Write-once systems for Sega Saturn include ADDCDW and SEGACDW.

ADDCDW

A write-once system that allows you to add data to a CD-R disc multiple times.
It also supports on-the-fly writing.

write on the fly

A method of writing to a CD-R disc while creating a sector image of the disc (no need to create a DSK file).
On-the-fly writing can be performed by linking XBLD and ADDCDW.