Hi, I'm looking for the floppy controller IC to repair my Franklin Ace. I've narrowed it down to it being the reason my floppies don't work correctly... they read just fine, but they won't write. The drives work, I can tell because if I plug them into a Disk ][ controller, they work great.
The IC I'm looking for is a USI chip, I think the part # is 4003000
If anyone has one from an old machine, please let me know. Thanks!