Programming CDTV/A570
                         ---------------------

Until now there has been no CDTV documentation available to the
public... Well, here are a few tips..... (My CDTV megademo will
be ready this year. I promise!!!)



Using CDTV.DEVICE
-----------------

The CDTV can be controlled by the CDTV.DEVICE, which is
a standard Amiga device.

Open the CDTV.DEVICE as standard, and issue commands to it
to play audio, read data, etc...

Examine cdtv.i, included in the source directory.

For example: To play track 2 on an audio CD in a CDTV, use
the following:

	include	"cdtv.i"

	...... your code here ......

     	move.l	MyCDTVRequest,a1        ; set this up as for any
					; other device
	move.w	#CDTV_PLAYTRACK,IO_COMMAND(a1)

	move.l	#2,IO_OFFSET(a1)	; track number
	move.l	#1,IO_LENGTH(a1)	; number of tracks to play

	move.l  4.w,a6
	jsr	_LVOSendIO(a6)		; send command



If you need to gain extra memory, you can shut down the cdtv.device
(apparently) by issuing a CDTV_STOP command to the device.



A570
----


You can tell if you are running on an A570 (as opposed to CDTV)
by:

	FindResident("A690ID")

If it returns NULL then it's not A570, if it returns an address
then its an A570