>I *might* even have some of those MC14500B chips

I could never work out what the destination market for that device was. I 
did envisage that it might be useable as a keyboard scanner or something 
similar, but the extra chips needed to store the program and act as a 
program counter seemed to ruin the small/cheap purpose of the MC14500 
itself.

You needed a 4 bit wide program store - i.e. half an eprom, and a program 
counter, i.e. something like a MC4020 or a presettable binary counter like 
the MC14520 (think I remember the right one), and it all just seemed too 
much. The end circuit was going to be as large, and as expensive, as using a 
normal single chip micro that had heaps more facilities. 

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