The Atari AVG custom chip is a direct replacement of the original Atari AVG (P/N: 137179-001). It is a custom Gate Array/Address Controller no longer offered in its original DIP package. This replacement was thoroughly exercised using a custom developed test jig and script, the analysis was used to validate the replacement and assure 100% compatibility. Games supported: Black WidowGravitarMajor HavocQuantumSpace DuelStar Wars/ESB
There have been other replacements on the market using TTL on a rather large board and their main selling point was "ease of repair". In other words, they could have a high failurer rate in time.