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Format of CDTSR internal variable structure

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Offset Size Description

00h

BYTE

hotkey scan code (see #00006)

01h

BYTE

hotkey shift states

02h

BYTE

flag: repeat

03h

BYTE

flag: custom repeat

04h

BYTE

flag: background polling

05h

DWORD

(read-only) internal timing variable

09h

DWORD

current track play position, in frames

0Dh

DWORD

current disk play position, in frames

11h

BYTE

number of entries in track program

12h

BYTE

index into track program currently playing (FFh if not playing)

13h

100 BYTEs

track program (each byte contains one track number)

77h

BYTE

saved cursor end scan line

78h

BYTE

saved cursor start scan line

79h

BYTE

currently playing track

7Ah

BYTE

CD driver media-change flag

7Bh

WORD

video base segment during last popup

7Dh

WORD

video page offset during last popup

7Fh

BYTE

currently-selected track

80h

DWORD

begin of custom repeat, in frames

84h

DWORD

end of custom repeat, in frames

88h

WORD

track program index of top list item