Texas Instruments Programmable Sound Generator
+----------+
D5 |1 +--+ 16| Vcc
D6 |2 15| D4
D7 |3 14| CLOCK
READY |4 13| D3
/WE |5 SN 12| D2
/OE |6 76489 11| D1
SND OUT |7 10| D0
GND |8 9| NC
+----------+