ACT apricot - Description; General

SOUND GENERATION
-r----, ,-.-----,
: 4MHz ~ DIVIDER I 2 MHz
~ _~S~ _ J ~ _ _ _ _ _ J
CK
READY
PERIPHERALS DATA BUS D
OCTAL
D-TYPE
LATCH
AUDI[]
SG CUT
SN76489
Figure 1. Sound Generator block diagram
SG Pin Definition
DOtoD7
CK
CE
WE
READY
AUDIO OUT
Data bus connection
2 MHz clock input
Chip Enable input
Write Enable input
Ready status output
Audio drive signal
DESCRIPTION
General
The Texas Instruments SN 76489 Programmable Sound
Generator (SG) forms the basis of the sound generation
circuitry. Internally the device consists of:
(a) Three programmable tone generators, each with
associated control registers. (Tone generators 1, 2,3).
(b) A single programmable noise generator with
associated control registers.