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9.
The Yamaha YM2149
This is a copy from
Software-Controlled Sound Generator (SSG)
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Overview
The SSG (Software-Controlled Sound Generator) is an NMOS-LSI device designed
to be capable of music generation. It only requires the microprocessor or
microcomputer (CPU) to initialize its register array, thus reducing the load
on the CPU. Music generation is carried out by the three sequence square wave
generator, noise generator, and envelope generator according to the set
parameters. This allows for the generation of music, special effects,
warnings, and various other types of sounds.
Features
5V single power supply
Easy connection to 8 bit or 16 bit CPU
Simple connection to external system through 2 sequence 8 bit I/O port
Wide voicing range of 8 octaves
Smooth attenuation by 5 bit envelope generator
Built-in 5 bit D/A convertor
Input of double frequency clock can be handled by built-in clock frequency
divider
TTL compatible level
Low power consumption (typical 125mW)
40 pin plastic DIL package
Pin compatible with AY-3-8910 manufactured by GI
Pin Layout
Vss(GND) 1
N.C 2
Analog Channel B 3
Analog Channel A 4
N.C 5
IOB7 6
IOB6 7
IOB5 8
IOB4 9
IOB3 10
IOB2 11
IOB1 12
IOB0 13
IOA7 14
IOA6 15
IOA5 16
IOA4 17
IOA3 18
IOA2 19
IOA1 20
Version: v005
"http://www.atari-forum.com/wiki/
40 Vcc(+5V)
39 Test1
38 Analog Channel C
37 DA0
36 DA1
35 DA2
34 DA3
33 DA4
32 DA5
31 DA6
30 DA7
29 BC1
28 BC2
27 BDIR
26 SEL
25 A8
24 A9
23 RESET
22 CLOCK
21 IOA0
".
18
Date: 22.05.2012
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