Technical information

SEGA Confidential

SATURN Virtual CD System User's Manual

2.3 Updating Part of a CD Image

This section describes the process for “partial CD image update”. This emulation

mode can be used when a real-time emulation has been run previously. First, com-

plete the preprocessing for real-time emulation and create a file with the extension

DSK. Execute steps 1 through 4 from the previous section.

Step 5- Launch the preprocessing program (VCDUTL.EXE) with the -f option.

Entering the command as shown in the example will start up the preprocessing

program

VCDUTL.EXE and create the file required for emulation. If the preprocessing

was executed without using the

-f option, only a file for real-time emulation is

created (revised). If this applies, perform the required steps for real time emulation

as described in step 5 onwards.

Example 5 C:\>VCDUTL.∆TSTGAME.SCR∆ISOFILE.DDD∆

DOSAUDIO.D01DOSAUDIO.D02∆-f∆DOSAUDIO.PAT[ENTER]

In this example the DOS file called DOSAUDIO.D01 (in the ISO9660 file called

ISO1FILE.DDD included in the CD image created by TSTGAME.SCR) is replaced with the

DOS file called

DOSAUDIO.D02.

Result 5 An update data file called DOSAUDIO.PAT is created.

There are no rules regarding the names for update data files.

Step 6- Change to English mode (applicable to users running DOS/V).

Step 7- Launch the VCD emulator (VCDEMU.EXE) with the -u option.

Enter the command shown in the example, start the VCD emulator, and run a partial

CD image update.

Example 7 C:\>VCDEMU∆TSTGAME∆-u∆DOSAUDIO.PAT[ENTER]

Result 7 The VCD emulator start up screen is displayed. The VCD

emulator has started.

Step 8- Start the operation from the target box.