Sound/speech board (A6) main chips

The 1981 sound/speech board (B-20887-3) uses an R6502-13 CPU (U3), an R6532-18 RIOT (U15), two 2716 EPROMs (U5, U6), an SC01 voice chip (U14), two 1408 DACs (U19, U20), LM741 op-amps (U21, U22), an LM379S amplifier (U23), an LM193 comparator (U24) and a 3.579545 MHz crystal.

Systems

• Gottlieb System 80

Related tips

• Sound/speech board supplies on P1
• Sound/speech board adjustments and test button
• Sound board MA-490 main chips
• Sometimes boots with a long tone and no sound: failed 6532 RIOT on the sound board
• Replace C33 on the speech and sound board
• Sound/speech power supply MA-149 parts
• Ground mod step 7: sound/speech power supply ground
• No sound at all

Source: System 80 Service Manual, Gottlieb