> Hi:
>
> I literally have a Black Box, see:
> http://www.pacificsites.com/~brooke/BlkBox.shtml  and have just finished
> drawing a schematic for it using ExpressSCH (by Express PCB).  There's a
> mystery 16 pin SOIC that has had it's top painted white and hand
> lettering of "12" larger letters and "298" smaller letters applied.  The
> "12" is the number engraved on the metal box (the only marking except
> for a bar code label.  I think the "298" is the ID for a pseudo random
> code used for the spread spectrum transmission.  The on-off modulating
> signal comes from this mystery IC.  The IC also blinks an LED.  I don't
> think it's a microprocessor because there are a couple of MC4060s and an
> MC4051 all used to process a 26.868 kHz crystal down to a 5 second
> transmit, 5 second pause signal that could have been put into a micro
> controller.  The date codes are for years near 1990.
>
> Since all the other chips are Motorola is there a Motorola (or maybe
> not) IC that could be powered from a 9 Volt battery on pin 3 and has
> ground on pin 11.  It must have an internal high speed clock.
>
> Schematic available via email, color image of PCB via CD-ROM.
>
> Thanks for any help,
>
> Brooke Clarke, N6GCE
>