In message <3FDB7B29.7E63C55C_at_cs.ubc.ca>
Brent Hilpert <hilpert_at_cs.ubc.ca> wrote:
> I have run across the LC1552 in another calculator (Digimatic M8-3) and
> had the same question regarding the manufacturer logo. Another calculator
> collector told me it was an early logo of Western Digital and that he had
> conformed this with people at WD.
This would be the same WesternDigital that made the 1770 series of floppy
drive controllers then. Neat - I didn't know they made calculator chipsets as
well.
I own a piece of history *grin* :)
> If those drivers are 75492 as Tony suggests, you can see an example of
> their use at
I've got a copy of the TI SN75492 datasheet somewhere. %DEITY knows if TI
still make them, though.
> > NSA298 / NS 436 - the "NS" looks a LOT like one of National Semiconductor's
> > old logos. Did NatSemi ever make LED display panels?
>
> Yes, and they are rather delicate, they were not hermetically sealed (at
> least the ones I have seen).
Eep.
Anyway, being the nutter I am, I intend to design and build a fairly simple
programmer's calculator. Why? Because I've got a load of microcontrollers in
my junkbox. Oh, and the pack of Hewlett-Packard HDSP-2202s. :-/
Later.
--
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
"I'll take your 20kV and raise you 200kV. Go on, step off that plate. I dare you."
Received on Sat Dec 13 2003 - 16:06:30 GMT