National MM9224.

Almost certainly not. 9224 is the date code.

AFAICT, the date code of Q15 is 9920 and for the relays it is 9807.
Would it make sense for a manufacturer to use old mask ROMmed stock in
a new design?

Lionel wrote:

On Fri, 16 Mar 2007 23:15:35 -0700, SparkyGuy <SparkyGuy@mumcrank.ck
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/

or could this be a SC\MP version of NatSemi. discontinued
see heavier traces on 20 and 40

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

It's from an old Clifford Intelliguard 200 car security system, vintage early
90's.

Anybody happen to have external wiring diagram or schematic for the PCB?

Thanks.

You'll have to wait until 2008 when the picture becomes available.

Identify the other ICs and work backwards.

AFAICT, the date codes for Q15 and for the relays suggest that it was
built as late as 9920. Is this confirmed by the date codes on the
other chips?

On Sun, 18 Mar 2007 02:14:07 +1100, the renowned Lionel
usenet@imagenoir.com> wrote:

On Fri, 16 Mar 2007 23:15:35 -0700, SparkyGuy <SparkyGuy@mumcrank.ck
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).

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

Eg. COP688CL/COP988CL

Best regards,
Spehro Pefhany

Identify the other ICs and work backwards.

The 8-pin says "3-544" and is probably a 73-544 clock gen. The resonator is
right there between it and the 40 pin'r.

I think the DIP-14 and DIP-16 IO chips should give you a clue as to
the uC's port layout. I'm betting that one chip drives various
external relays while the other accepts inputs from sensors.

Brief trace tracing:

DIP 40 DIP 8
-------------
pin 3 pin 3
pin 4 pin 2
pin 5 Pin 4

I think the DIP-14 and DIP-16 IO chips should give you a clue as to
the uC's port layout. I'm betting that one chip drives various
external relays while the other accepts inputs from sensors.

The DIP-16 does drive the relay coils.

One of them has Motorola logo, one National Semi. Other than that, the part
#s have been successfully rubbed off. A ghost of them remains, but an
electron-scanning microscope might be needed... (c;

One of them has Motorola logo, one National Semi. Other than that,
the part #s have been successfully rubbed off. A ghost of them
remains, but an electron-scanning microscope might be needed... (c;


How about some of that magickal fluorescent spray stuff from CSI? :-)

I've used white spirit, a metal halide lamp, and the lens from an old Zent
35mm camera as a high powered magnifier. I got most of the IC numbers from
a LambdaPro laser PSU, and LambdaPro grind them off to hide them. If
they've only been rubbed enough to obscure them a bit, this should work on
them. Try with different light and viewing angles.

I've used white spirit, a metal halide lamp, and the lens from an old
Zent 35mm camera as a high powered magnifier. I got most of the IC
numbers from a LambdaPro laser PSU, and LambdaPro grind them off to
hide them. If they've only been rubbed enough to obscure them a bit,
this should work on them. Try with different light and viewing
angles.

What's "American" for white spirit?

I'm willing to try...

Brief trace tracing:

I think the DIP-14 and DIP-16 IO chips should give you a clue as to
the uC's port layout. I'm betting that one chip drives various
external relays while the other accepts inputs from sensors.

The DIP-16 does drive the relay coils.

One of them has Motorola logo, one National Semi. Other than that, the part
#s have been successfully rubbed off. A ghost of them remains, but an
electron-scanning microscope might be needed... (c;

Thanks.