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CF32705 obsolete component identification

Hi all,

I am trying to debug a circuit but I cannot find any information on this component. A datasheet would be great, although I would be happy even with just a description.

Markings that I read are :

3124Y1T 

CF32705  ….I believe that’s the part number 

I think it may have been have been a custom chip, but I have no idea what it does.  Might just be some kind of logic chip? I think its from the early 90s. Its a part of a GTO Thyristor gate driver.