Sound board MA-766 main chips

The MA-766 sound board has two AY-3-8913 sound generators (XO-646) at H4 and K4, an SP0250 speech chip (XO-645) at E4, an AD7528 DAC (XO-647), two 6116-type 2K RAMs (XO-191) and two LM324 op amps (XO-644). Its clocks are a 4.0 MHz crystal (XO-366) and a 3.12 MHz crystal (XO-639).

Systems

• Gottlieb System 80B

Related tips

• Sound boards listed for System 80 to 80B
• The System 80 sound board generations by game number
• Sound board won't boot with the music board attached: fake YM2151 chip
• Sound/speech power supply MA-149 parts
• Very quiet sound with a 60 Hz hum: bad capacitor on the A5 board
• Ground mod step 7: sound/speech power supply ground
• System 80B sound board LED stays dark until the CPU boots

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