On Sat, 17 Mar 2007 12:40:13 -0500, Spehro Pefhany
put finger to keyboard and
composed:

On Sun, 18 Mar 2007 02:14:07 +1100, the renowned Lionel
wrote:

On Fri, 16 Mar 2007 23:15:35 -0700, SparkyGuy
wrote:

Haven't been able to identify this controller. Don't need replacement; it's
got custom code, I'm sure. Would be nice to have pin IDs.

http://img6.picsplace.to/img.php?file=img6/27/CliffordPCB.jpg

Looks like a custom mask-programmed micro. It's a Nat-Semi of some
variety, but I'm not familiar enough with their range of
microcontrollers to make an intelligent suggestion as to which one. If
you can find the right 'family' on their website, you should at least
then be able to identify clocks, power & I/O pins, if that's any help
to you. You might also try contacting a support person there & see if
they have any ideas:
http://www.national.com/

I'd guess it to be a COP8 8-bit CMOS microcontroller (mask
programmed). Clock should be on pins 6 and 7, which it looks to be
(axial-lead ceramic caps, 1/8W bias resistor and 2-pin resonator in
the photo). You should see a clock on pin 6.

/Reset should be on pin 34 (but it looks to be tied to another pin).

The COP688 datasheet identifies pin 36 as a WDOUT (watchdog output)
pin, so your observation would make sense.

http://www.datasheetarchive.com/data...rticle=1178138

Vcc should be on 8 and GND should be on 33.

Eg. COP688CL/COP988CL

Best regards,
Spehro Pefhany

- Franc Zabkar
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