simple processor from 74154?

[ben franchuk]

Ed Kelleher wrote:
> At 05:45 PM 9/25/2004, Sellam wrote:
> 
>> > Does anyone remember a construction project from Popular Electronics (I
>> > think), perhaps in the late '60's, that made a simple processor from a
>> > 74154 4 line demultiplexer and a handful of diodes?
>>
>> Did they even have 74154's in the late 1960s?  At any rate, sounds 
>> like an
>> interesting project.
> 
> 
> TI TTL Data Book for Design Engineers, 1st edition was copyrighted 1973.
> It lists the 74154 and other parts up to the 74298.
> 
How come the neat CMOS chips like BCD adders and stuff have never made it
to TTL?