Intel had a prototype of this central processor since 1969 and the costs
of development were already paid for. Now Intel had to make a choice:
either they shelved the project or the chip could be used as model
for a chip that Intel could make and pay for by them selves. Thus the
Intel chip became the first micro processor(1).
The invention is published on 15 November this year in Electronic News(2)
the first single chip CPU was the Intel
4004. It processed data in 4 bits, but its instructions were 8
bits long. Program and data memory were separate, 1K of data memory
and a 4K of program memory (in the form of a 4 level stack, used for
CALL and RET instructions). There were also sixteen 4-bit general purpose
registers(3) The processor'
speed is 60.000 operations per second.
The 4004 consists of 2,300 transistors based on 10 micron
technology fitting on a 12mm2 area.
The microprocessor has
46 instructions. The 4040 is an enhanced version of the 4004, adding
14 instructions, larger stack (8 levels) and 8K program space. It can
address 640 bytes. Documentation is written by Adam Osborne. The chip
is introduced to the public in Las Vegas by Wayne
Pickette. The sales price will be US$ 200 per piece.(5)