LIA3420, This IC is found on Commodore Amiga board at U800, used For Sale
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LIA3420, This IC is found on Commodore Amiga board at U800, used : $12
This IC is used and has been in my collection for at least 26 years. As time has passed, specific information regarding this chip is not generally found. On a Commodore Amiga A2000, this device is found at U800. Sometime back I found a website that sells new/used parts for the pinball industry and they were selling this IC.