Sound board MA-490 main chips

The MA-490 sound board runs on an R6503 CPU (XO-357) with an HM7643 sound PROM at U4 (PR-51), an LM380N amplifier at U5 (XO-632) and an NE555 timer at U8 (XO-631). Its piggyback holds an R6530 (XO-359) at U2A.

Systems

• Gottlieb System 80
• Gottlieb System 80A
• Gottlieb System 80B

Related tips

• Sound boards listed for System 80 to 80B
• Sound/speech board (A6) main chips
• No sound at all
• Distorted sound
• Some or all sounds missing
• Replace C33 on the speech and sound board
• How the original System 80 sound board makes sound
• Sound/speech board supplies on P1

Source: Premier Technology Parts Catalog (System 80, 80A and 80B), Gottlieb / Premier