At 01:01 AM 13/08/2009, you wrote:
>Maybe a TMS1751C or something in that line with a user part number on it.
>
>TMS1751C is a CMOS 4 bit microcontroller with 512 bytes of ROM, 32(4
>bit) words of RAM, 4 dedicated inputs and 7 dedicated outputs. 3 to 6
>volts operation, 16 pin DIP. Sorry I don't have a pinout.

Just to make it clear, these old things with house numbers are almost
always MASK PROGRAMMED, meaning that the original buyer had to ante up
a mask charge and order a minimum quantity with at least 3 digits (4-1/2
from Japanese suppliers). Especially 4-bitters.

Even a small PIC should be able to handle this easily, add a regulator
and if necessary clock on a little daughterboard. Suggest you not underprice
it in relation to alternatives so it is worth your while.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com



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