WTD: LC1552B, ITT 492-5 and NatSemi NSA298 data

From: Philip Pemberton <philpem_at_dsl.pipex.com>
Date: Fri Dec 12 16:39:31 2003

Hi,
  Someone's just given me a Commodore Minuteman 3MW (model MM3MW) calculator.
The device itself is working fine, but I still need to replace the battery
pack and charge connector (the batteries were rechargeable nicad, N size).
Anyway, just to satisfy my curiosity, I'd like to get some data on the ICs
used inside it - these are:
  LC1552B / 7438 - looks like the main controller. Has some strange logo I've
     never seen before - kind of a _/- (a squared off S?) with a circle
     printed over the top.
  ITT / 492-5 / 7445 - these appear to be LED drivers. I've never seen a part
     number like this. BTW, the "7445" is printed vertically, the rest of the
     p/n is printed horizontally (as normal).
  NSA298 / NS 436 - the "NS" looks a LOT like one of National Semiconductor's
     old logos. Did NatSemi ever make LED display panels?
     
  Now, to finish satisfying my curiosity, does anyone know anything about the
Commodore MM3MW? A schematic diagram or service manual would be nice :)
     
Thanks.

-- 
Phil.                              | Acorn Risc PC600 Mk3, SA202, 64MB, 6GB,
philpem_at_dsl.pipex.com              | ViewFinder, 10BaseT Ethernet, 2-slice,
http://www.philpem.dsl.pipex.com/  | 48xCD, ARCINv6c IDE, SCSI

Received on Fri Dec 12 2003 - 16:39:31 GMT