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Format of CR-ROM control block

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Offset Size Description

00h

BYTE

function code
00h = eject disk
01h = lock/unlock door
02h = reset drive
03h = control audio channel
04h = write device control string
05h = close tray

---functions 00h, 02h, 05h---

no further fields

---function 01h---

01h

BYTE

lock function
00h = unlock door
01h = lock door

---function 03h---

01h

BYTE

input channel (0-3) for output channel 0

02h

BYTE

volume for output channel 0

03h

BYTE

input channel (0-3) for output channel 1

04h

BYTE

volume for output channel 1

05h

BYTE

input channel (0-3) for output channel 2

06h

BYTE

volume for output channel 2

07h

BYTE

input channel (0-3) for output channel 3

08h

BYTE

volume for output channel 3

---function 04h---

01h

N BYTEs

bytes to send directly to the CD-ROM drive without interpretation

Note:

(function 03h) output channels 0 and 1 are left and right, 2 and 3 are left prime and right prime; a volume of 00h is off.