8 Mar
2013
8 Mar
'13
4:02 p.m.
Does anyone happen to have the pinout handy for a Natsemi MM5736 IC
(mid-'70s)? In particular, I want to know which pin is GND.
I came home with a little Novus 650 calculator yesterday, but the power
switch (which switches the ground line) is dead - of course the keypad's
heat-staked so before I waste time having to do surgery in order to clean
switch contacts, I'd like to see if the calc looks like it might be
otherwise functional.
cheers
Jules
8 Mar
8 Mar
5:11 p.m.
On 3/8/2013 1:02 PM, Jules Richardson wrote:
Does anyone happen to have the pinout handy for a Natsemi MM5736 IC
(mid-'70s)? In particular, I want to know which pin is GND.
I came home with a little Novus 650 calculator yesterday, but the
power switch (which switches the ground line) is dead - of course the
keypad's heat-staked so before I waste time having to do surgery in
order to clean switch contacts, I'd like to see if the calc looks like
it might be otherwise functional.
cheers
Jules
the 1977 NatSemi MOS/LSI Data book lists only the MM5734 and MM5737 with
no reference to the MM5736. GND is shown as pin 6 on the 5737
s2
5:45 p.m.
On 3/8/2013 2:11 PM, steve shumaker wrote:
On 3/8/2013 1:02 PM, Jules Richardson wrote:
and a bit more googling shows that probably is of no help at all. the
mm5736 is a 6 digit calculator 18pin dip. the mm5737 is an 8 digit
calculator 24pin dip. sorry!
s2
Does anyone happen to have the pinout handy for a Natsemi MM5736 IC
(mid-'70s)? In particular, I want to know which pin is GND.
I came home with a little Novus 650 calculator yesterday, but the
power switch (which switches the ground line) is dead - of course the
keypad's heat-staked so before I waste time having to do surgery in
order to clean switch contacts, I'd like to see if the calc looks
like it might be otherwise functional.
cheers
Jules
the 1977 NatSemi MOS/LSI Data book lists only the MM5734 and MM5737
with no reference to the MM5736. GND is shown as pin 6 on the 5737
s2
5:51 p.m.
On 3/8/2013 2:11 PM, steve shumaker wrote:
On 3/8/2013 1:02 PM, Jules Richardson wrote:
found it: GND for the MM5736 18pin DIP is Pin 18. (check out "build
this electronic stopwatch" at www.schematicsforfree.com)
Steve
Does anyone happen to have the pinout handy for a Natsemi MM5736 IC
(mid-'70s)? In particular, I want to know which pin is GND.
I came home with a little Novus 650 calculator yesterday, but the
power switch (which switches the ground line) is dead - of course the
keypad's heat-staked so before I waste time having to do surgery in
order to clean switch contacts, I'd like to see if the calc looks
like it might be otherwise functional.
cheers
Jules
the 1977 NatSemi MOS/LSI Data book lists only the MM5734 and MM5737
with no reference to the MM5736. GND is shown as pin 6 on the 5737
s2
6:08 p.m.
On 03/08/2013 04:51 PM, steve shumaker wrote:
found it: GND for the MM5736 18pin DIP is Pin 18.
(check out "build this
electronic stopwatch" at www.schematicsforfree.com)
Thanks - Alexandre just beat you to that (off-list) but then the phone rang
and I didn't get chance to send a "got it now" message to the list! :-)
I just tried quickly and the calc fires up with 'E0' on the display, which
is probably right as the manual seems to imply that 'CE/C' needs pressing
before doing anything. That seems encouraging, anyway (I think the display
IC is just a bunch of LED drivers with no logic element, so the core
calculator IC is at least outputting sensible characters)
Next step is to take the keypad apart - and I may have to bite the bullet
and replace the flexible strip between the keypad and the main PCB; it's
fragile as heck and the copper traces are separating from the plastic backing.
cheers
Jules
7:39 p.m.
I have one page from a send a card in type brochure/databook
Dated May 1974
http://www.collection.archivist.info/archive/DB/DB88_National/page0375.jpg
Dave Caroline
4154
days inactive
4155
days old
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dave.thearchivist＠gmail.com -
jules.richardson99＠gmail.com -
shumaker＠att.net