Версия для печати :: 4х битки. Были такие?

Цитата:

Да ты что читать не умеешь? Написано же - 8битный он!
мжп по информации - http://www.intel4004.com/

Кто такое сказал? Где там так написано?
Цитата:

Q.: Was there anything unique about the 4004?

F.F.: The architecture of the 4004 was a fairly straightforward register-based architecture with an address stack, typical of small CPUs of the day (in fact, it was very similar to the architecture of the Datapoint terminal CPU -- independently developed by Computer Terminal Corp., at about the same time – which became the architecture of the 8008.) The 4004, however, operated on 4-bit data words, contrary to the 8-, 12- or 16-bit words of most other small CPUs. This was done to minimize the number of transistors required for its implementation, taking advantage of the fact that the target application was calculators. The 4004 instructions were stored in ROM memory, while data was stored in separate register memory. The addressing of the data memory was rather cumbersome. The most unusual feature was the use of a 4-bit bus where addresses, instructions and data were multiplexed. This choice was determined by the requirement that all the chips of the 4000 family be packaged in a 16-pin, dual-in-line (DIP) package. At that time Intel’s management had decided that all its chips had to be packaged in 16-pin DIP packages for obscure reasons. This "feature" of the 4004 actually cost a major speed penalty since 5 clock cycles were required to fetch and execute an instruction (3 cycles to send the 12-bit address and 2 cycles to fetch the 8-bit instruction.) The other concession to the intended calculator application was the existence of an instruction to convert the content of the 4-bit accumulator from binary to decimal. Overall, the most important contribution of the Hoff-Mazor team was to create a rather economical architecture by leaving out all unnecessary baggage, but at the cost of rigid ROM/RAM partitioning and an awkward addressing scheme for data stored in RAM.

Он 4х битный. Обрабатывае 4х битные данные и имеет 4х битный АЛУ. 8ми битным был i8008.

Цитата:

Один бит - один транзистор

Мультивибратор и тот 2хбитный - 2 транзистора.

(Отредактировано автором: 14 Сентября, 2006 - 07:44:20)