40-pin controller IC identity?

[Franc Zabkar]

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/datasheet.php?article=1178138

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

Eg. COP688CL/COP988CL

Best regards,
Spehro Pefhany

- Franc Zabkar

 

[SparkyGuy]

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;

Thanks.

 

[Rich Grise]

Brief trace tracing:

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


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;

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

Cheers!
Rich

 

[Lostgallifreyan]

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.

 

[SparkyGuy]

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...

 

[Lostgallifreyan]

What's "American" for white spirit?

I'm willing to try...

Paint thinner, as used for domestic gloss paint. Use the good stuff rather
than turpentine which has greasy impurities in. It's useful because it
evaporates fast but not too fast, and it won't attack anything on most
circuit boards, or the IC markings.

 

[Franc Zabkar]

Brief trace tracing:

COP8 NMC9306
DIP 40 DIP 8
-------------------------
SO pin 3 pin 3 DI
SK pin 4 pin 2 SK
SI pin 5 Pin 4 DO

I'd say that the DIP-8 IC is a serial EEPROM. It probably stores the
security code.

The DIP-16 does drive the relay coils.

The ULN2003 was made by several manufacturers including Motorola. If
its pins are not a match, then I'd try other ULN series devices.

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.

Could the DIP-14 chip be a hex buffer, eg 74C90x ???

- Franc Zabkar