AY-3-8910


GND	1 •	40	Vcc
NC	2	39	TEST 1
ANALOG B	3	38	ANALOG C
ANALOG A	4	37	DA0
NC	5	36	DA1
IOB7	6	35	DA2
IOB6	7	34	DA3
IOB5	8	33	DA4
IOB4	9	32	DA5
IOB3	10	31	DA6
IOB2	11	30	DA7
IOB1	12	29	BC1
IOB0	13	28	BC2
IOA7	14	27	BDIR
IOA6	15	26	TEST 2/SEL
IOA5	16	25	A8
IOA4	17	24	A9
IOA3	18	23	RESET
IOA2	19	22	CLOCK
IOA1	20	21	IOA0

Pin	Symbol	Description
1	GND	ground
2	NC	no connection
3	ANALOG B	analog output, channel B
4	ANALOG A	analog output, channel A
5	NC	no connection
6	IOB7	I/O port B
7	IOB6	I/O port B
8	IOB5	I/O port B
9	IOB4	I/O port B
10	IOB3	I/O port B
11	IOB2	I/O port B
12	IOB1	I/O port B
13	IOB0	I/O port B
14	IOA7	I/O port A
15	IOA6	I/O port A
16	IOA5	I/O port A
17	IOA4	I/O port A
18	IOA3	I/O port A
19	IOA2	I/O port A
20	IOA1	I/O port A
21	IOA0	I/O port A
22	CLOCK	clock input
23	RESET	master reset (active low)
24	A9	chip select
25	A8	chip select
26	TEST 2/SEL	test pin (do not connect)
27	BDIR	bus direction
28	BC2	bus control
29	BC1	bus control
30	DA7	data/address bus
31	DA6	data/address bus
32	DA5	data/address bus
33	DA4	data/address bus
34	DA3	data/address bus
35	DA2	data/address bus
36	DA1	data/address bus
37	DA0	data/address bus
38	ANALOG C	analog output, channel C
39	TEST 1	test pin (do not connect)
40	Vcc	supply voltage

Parameter	Value	Unit
Minimum clock frequency	1	MHz
Maximum clock frequency	2.5 (AY-3-8910) 4 (YM2149)	MHz

Notes

Chip is only active when A9 is low, A8 is high, and address bits DA7-DA4 are low.
Address bits DA3-DA0 select one of the 16 control registers.
For YM2149, connecting pin 26 to ground divides CLOCK by 2.
BDIR=0, BC2=0, BC1=0: inactive, DA7-DA0 high impedance
BDIR=0, BC2=0, BC1=1: latch address, DA7-DA0 are inputs
BDIR=0, BC2=1, BC1=0: inactive, DA7-DA0 high impedance
BDIR=0, BC2=1, BC1=1: read, DA7-DA0 are outputs
BDIR=1, BC2=0, BC1=0: latch address, DA7-DA0 are inputs
BDIR=1, BC2=0, BC1=1: inactive, DA7-DA0 high impedance
BDIR=1, BC2=1, BC1=0: write, DA7-DA0 are inputs
BDIR=1, BC2=1, BC1=1: latch address, DA7-DA0 are inputs

Control registers:

$00	tone generator A frequency, low 8 bits
$01	tone generator A frequency, high 4 bits
$02	tone generator B frequency, low 8 bits
$03	tone generator B frequency, high 4 bits
$04	tone generator C frequency, low 8 bits
$05	tone generator C frequency, high 4 bits
$06	noise generator frequency, low 5 bits
$07	I/O port and mixer control
$08	channel A amplitude/envelope enable
$09	channel B amplitude/envelope enable
$0A	channel C amplitude/envelope enable
$0B	envelope frequency, low 8 bits
$0C	envelope frequency, high 8 bits
$0D	envelope shape
$0E	I/O port A data
$0F	I/O port B data

Note: Data is maintained by an independent source and accuracy is not guaranteed. Check with the manufacturer's datasheet for up-to-date information.

Programmable sound generator

Specifications

Notes