Yamaha OPL3-SA3 specifications Joystick, Modem, YMF715E, Multi-purposeSelect Pin Status RO

YMF715E

Hardware Volume Interrupt Channel Configuration (R/W):

Index	D7	D6	D5	D4	D3	D2	D1	D0
17h	-	-	IRQ-B MV	IRQ-A MV	-	*	*	*

The Hardware Volume can source interrupt. This register indicates which interrupt channel will be used. If IRQ-A MV=“1”, assigned to IRQ-A.

default : 00h

Notice)

Writing to the other bit positions is invalid, though the bits remarked * (D2-D0) will retain written values. D3, D6 and D7 will always returns “0” when read.

Multi-purpose Select Pin Status (RO):

Index	D7	D6	D5	D4	D3	D2	D1	D0
18h	”1”	SEL2	SEL1	SEL0	-	-	-	“0”

This is a status register that indicates the state of multi-purpose pin.

SEL2-0...The state of SEL2-0 pins is reflected to these bits. The multi-purpose function of YMF715E (OPL3-SA3) can be confirmed by reading the bits. These bits are read only.

default : (1xxx0000)b

9-2. Joystick

port	D7	D6	D5	D4	D3	D2	D1	D0
xxh	JBB2	JBB1	JAB2	JAB1	JBCY	JBCX	JACY	JACX

JACX... Joystick A, Coordinate X

JACY... Joystick A, Coordinate Y

JBCX... Joystick B, Coordinate X

JBCY... Joystick B, Coordinate Y

JAB1... Joystick A, Button 1

JAB2... Joystick A, Button 2

JBB1... Joystick B, Button 1

JBB2... Joystick B, Button 2

Notice)

The Joystick portion must be re-initialized by writing any value to the Joystick port after resuming from the power down/save or the Joystick portion power down mode.

9-3. MODEM

The following pins are for MODEM interface with PnP supported. /MCS... chip select (eight consecutive byte I/O)

MIRQ... interrupt signal

And MIN is the analog input to mix the telephone line.

MIN... analog input

May 21, 1997

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