Can someone confirm this chip equivalence?

Hello, I'm repairing my A1010 Amiga external floppy drive - the actual drive works (tested by plugging it into the internal A500 floppy connector), so the fault should be on the latch board inside; there are two chips, a 74LS74 D Flip-Flop and one chip (also 14 pin) with number M53238P preceded by the Mitsubishi logo. Given the required function, and connections on the adapter board, I am 99% sure that it's a 74LS38 Quad NAND open-collector equivalent - but googling doesn't turn up a datasheet, just a gazillion chinese parts vendors. Can someone just confirm this in a cross-reference? Or a A1010 schematic? Or their own drive? Thanks, Joe. PS. Symptom is that the drive clicks but never spins. I've already taken out the chips and replaced them - this time in sockets. So if I'm wrong it's a simple matter of undoing the 20-odd screws yet again (Verdammte Post mit deren entstoerregelungen von damals...) and replacing the chip. I just want to double-check before plugging it into the A500 again tonight. -- Joachim Thiemann :: http://www.tsp.ece.mcgill.ca/~jthiem