The 4004 was a marketplace failure:
- slow (approx. 100,000 instructions/sec)
- only 4 bit word size
- Busicom (Japanese financer) abandoned this project after having
funded most of development cost.
- Result: gave microprocessor world dominance to Intel
- BUSICOM designed various calculators and
related products using the 4000 microprocessor family.
- since microprocessor programmable,
it had generality of purpose
- could be used for other purposes as well, e.g. a controller, etc..