Greg Mayman wrote in a message to Ben Ritchey:

 -=> Ben Ritchey said to All
 -=> about "UNKNOWN IC" on 08-18-04  07:08.....

 BR> Chip markings:

 BR> ////////////////////
 BR> --------------------
 BR> |  (c) 1988  TCE   |
 BR> |   SC403736P      |
 BR> |  1A66100-05B     |    not to scale, of course
 BR> |  (M) 6A58P8915   |/
 BR> --------------------
 BR> (c) is a "c" in a circle
 BR> (M) is the Motorola insignia in a circle

 GM> "C" in a circle is "Copyright" especially when
followed by a date.

 GM> Almost certainly it is a special chip made for a specific purpose
 GM> for a particular manufacturer, with no equivalent.

And that implies software,  and that the chip has some code in it...

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