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Chapter 1 Overview
1.1 Virtual CD emulator overview
- Pseudo CD playback emulation of MS-DOS file data
- GAME-CD disc image generation
- Pseudo CD playback emulation of GAME-CD disc image
- Partial update playback emulation of disk image
- Generate TOC file for Ito Once CD creation
- Error simulation
- Recording and displaying communication contents between VCD emulator and CD block
-Received commands and status
-Processing result (error) message
-Selection of communication content display (only errors, all)
- TOC information display
- Display correlation information
-Positional relationship between MS-DOS file and generated CD disk image
The following three types of MS-DOS file formats can be accessed.
(1) A collection of data files before becoming a CD image
An MS-DOS file that contains data before creating a CD image. (Hereafter referred to simply as “data file”)
The data file is determined according to the access position of the CD access instruction received by the virtual CD emulator from the VCD I / F board, edited so that it becomes a CD image, and sent to the VCD I / F board.
As a result, the target box can receive data in the same form as entered from the CD drive. This emulation is called “direct DOS file access”.
In this case, if the data for creating the CD image is prepared, emulation can be started with simple preprocessing, but the data is sent while editing, so playback is performed at the same timing as the input from the original CD drive. You can not. Therefore, the channel interleave function (described later) that requires complex disk access cannot be supported in this operation mode. Similarly, the MPEG function cannot be supported.
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