13 Dec
2003
13 Dec
'03
8:06 a.m.
In message <3FDB7B29.7E63C55C(a)cs.ubc.ca>
Brent Hilpert <hilpert(a)cs.ubc.ca> wrote:
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(a)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."
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).