One SN76489 is piggybacked on another. They share many pins and only a small number need to be isolated from each other.
• Removal of !READY pin
• Isolation of !WRITE_ENABLE pin
• Isolation of SOUND_OUT pin
• Shared data bus, ground and 5V pins
Saturday, May 25, 2013
Piggybacked SN76489 Chips
One SN76489 is piggybacked on another. They share many pins and only a small number need to be isolated from each other.
• Removal of !READY pin
• Isolation of !WRITE_ENABLE pin
• Isolation of SOUND_OUT pin
• Shared data bus, ground and 5V pins
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