3.2 Defining the disk session structure

Figure 3.1 shows an overview of the disk session structure definition.

↑     Disc  output file name
｜          Session  { CDROM｜SEMIXA }                  ↑
｜              LeadIn MODE1                   ←Lead In ｜
｜                                                      ｜
｜              EndLeadIn                               ｜
｜                                                      ｜
｜               SystemArea  System area file name      ｜
｜                                                      ｜
｜              Track  { MODE1 }               ←Track 1 ｜
｜                :                                     S
D              EndTrack                                 E
I              Track  { MODE1 | MODE2|CDDA }  ←Track 2  S
S                :                                      S
K              EndTrack                                 I
｜                                                      O
｜              LeadOut { MODE1 | MODE2|CDDA } ←Leadout N        
｜                  Empty 300                           ｜       
｜              EndLeadOut                              ↓           
｜          EndSession                                                     
↓      EndDisc                                                              

Figure 3.1 Disk session definition

one View table

Title Command specifications

Command Starting disk definition

Keyword Disc

No 2.1

Format

Disc dskfile

parameters

dskfile: Disk image file (extension is "DSK")

function

Begins disk definition.

remarks

none

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Title Command specifications

Command Finishing the disk definition

Keyword EndDisc

No 2.2

Format

EndDisc

parameters

none

function

Finish the disk definition.

remarks

none

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Title Command specifications

Command Specifying catalog number

Keyword Catalog No.

No 2.3

Format

CatalogNo digits

parameters

digits: Numeric string of up to 13 digits.

function

Define the catalog number.

remarks

This command is retained for compatibility. No need to write.
Catalog numbers are not reflected in disk images.

one View table

Title Command specifications

Command Starting session definition

Keyword Session

No 2.4

Format

Session disc type [filename]

parameters

disctype: Disc type (CDROM or SEMIXA)

filename: File name to output the disk image. Optional.

function

Begins session definition.

remarks

Parameter filename is kept for compatibility. No need to write.

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Title Command specifications

Command Ending session definition

Keyword EndSession

No 2.5

Format

EndSession

parameters

none

function

Finish the session definition.

remarks

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Title Command specifications

Command Starting lead-in area definition

Keyword LeadIn

No 2.6

Format

LeadIn trktype

parameters

trktype: Track type (only MODE1 can be specified)

function

Begin defining the lead-in area.

remarks

Currently, only MODE1 can be defined for the first track.

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Title Command specifications

Command End of lead-in area definition

Keyword EndLeadIn

No 2.7

Format

EndLeadIn

parameters

none

function

Finish the lead-in area definition.

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Title Command specifications

Command Defining the system area

Keyword System Area

No 2.8

Format

SystemArea filename

parameters

filename: Data file for system area.

function

Writes the specified file to the system area (00:02:00 to 00:02:15) specified by ISO9660.

remarks

Null data will be output for parts of the specified file that are less than 16 sectors (32768 bytes). If it exceeds 16 sectors, an error will occur.

one View table

Title Command specifications

Command Starting the readout area definition

Keyword Lead Out

No 2.9

Format

LeadOut trktype

parameters

trktype : Track type (MODE1, MODE2 or CDDA)

function

Begin defining the readout area.

remarks

Specify the track type in the lead-out area to be the same as the last track in the session.

one View table

Title Command specifications

Command Finishing the readout area definition

Keyword EndLeadOut

No 2.10

Format

EndLeadOut

parameters

none

function

Finish the leadout area definition.

one View table

Title Command specifications

Command Defining null data for readout

Keyword Empty

No 2.11

Format

Empty nsect

parameters

nsect: Number of output sectors of null data in the lead-out area.

function

Outputs null data for the specified number of sectors.

remarks

This command is left in place due to VCD emulator limitations. For reliable operation of the emulator, it is recommended to output 300 sectors or more.