Technical information

SEGA Confidential

SATURN Virtual CD System User's Manual

Developing Content and Programs

Image data and programs placed on the CD must be prepared in MS-DOS file for-

mat.

• About the CDDA file format

• MS-DOS file format binary file

• Data within the VCD PC-compatible machine must be arranged in Intel format (Little Endian),

as shown in Figure 3 below. When data is in Motorola format (Big Endian), a byte swap must be

implemented in advance.

LSB MSB

Lch 1 Rch 1 Lch 2 Rch 2 Lch 3 Rch N

512 512 512

D7 D0 D15 D8

(INTEL Format)

HDD

Byte

Figure 3 CDDA File Format

CD Configuration Data

Specifies how MS-DOS files such as multimedia content and programs will be lo-

cated on the CD. A format that allows the CD configuration to be scripted is input

according to a preset format using a text editor. These files are called script files, and

their contents are called scripts. These script files describe CD configuration data.

Section 3.0 describes how they are created.

Creating CD Configuration Information Files

Runs the VCDPRE.EXE program when a simulation uses direct DOS file access. When

a script file is input into

VCDPRE.EXE, it calculates the relationship between the MS-

DOS files and CD access location (values in minutes, seconds, and frames), and

creates lookup table files. The files generated by

VCDPRE.EXE are read and used by

the VCD emulator.

Creating the CD Image File

Run the VCDBUILD.EXE program when the system is in real-time emulation mode.

When a script file is input into

VCDBUILD.EXE, the CD image and TOC data are cre-

ated in a file. These files created by

VCDBUILD.EXE are read and used by the VCD

emulator.