(2) A file containing the CD image as it is

CD has various format standards, and a file in which data is edited and written in a form and length according to the standard is called a "CD image file". The virtual CD emulator sends this “CD image file” directly to the I / F board. To do this, it is necessary to create a CD image once before starting emulation.
This case is called “real-time emulation”.
In this operation mode, complicated sector allocation such as channel interleaving is executed before the emulation starts, so there is no functional limitation like “Direct DOS file access” in the previous section.

data file, plays the modified data file, and performs the playback test using the CD image file for the other part. This emulation is called "CD image partial update".

Which of these emulations is executed is determined by the virtual CD emulator based on the existence of a file when the virtual CD emulator starts up and the command line parameters for starting the virtual CD emulator.
The file extension is used to identify the existence of the file, and its body part is specified by the command line parameter for starting the virtual CD emulator.

CD emulation software consists of a virtual CD emulator program and three preprocessing programs.

VCDEMU.EXE


This program performs virtual CD emulation.


VCDPRE.EXE


This is a pre-processing program for "Direct DOS file access".


VCDBUILD.EXE


This is a pre-processing program for performing "real-time emulation".


VCDUTL.EXE


This is a pre-processing program for performing "CD image partial update".