But you can find it with different labels.On Wardner/Pyros it's 'WT1' :
'T.T.1' on Twin Cobra/Kyuukyoku Tiger :
'L-01' on Sky Shark/Hi Sho Zame :
The IC is a DIP42 .600 mil package and it accomplishes graphical functions generating the backgrounds.First of all I identified the pinout and external connections with the board.Then I thought about different designs of the equivalent circuit also studying how same functions were achieved in previous hardware.Lastly I came to a replacement board with same dimensions of original IC :
The "smoke test" was successful, the replacement worked on all boards I could try.
On Wardner/Pyros :
On Twin Cobra/Kyuukyoku Tiger :
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