Questions tagged [intel-4004]

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22 votes
3 answers
7k views

How could the Intel 4004 address 640 bytes if it was only 4-bit?

I am reading Computer Organization and Architecture, 10th ed. by William Stallings and I found this on page 26. where it says the addressable memory of 4004 is 640 bytes. But it appears that the ...
15 votes
2 answers
2k views

Where can I find more information on the internal architecture of the Intel 4004?

I've been studying this chip lately. I can easily find block-level architecture or transistor-level diagrams on the web, but nothing in between. For example, I'm curious about how the 2-word ...
12 votes
1 answer
2k views

Which endian was the Intel 4004?

The Intel 4004 had 4-bit buses and data words, but the program counter and code address space was 12 bits. Was the 4004 little endian (like all of Intel's later microprocessors and microcontrollers) ...
2 votes
2 answers
426 views

What is a 4002's "RAM Status Character"?

I was looking at this emulator of a Intel 4004, and I noticed something with the RAM. It had something called "Status Chars". There were 4 of them per memory line and all were 4-bit numbers ...
7 votes
5 answers
2k views

Pulling my hair out over a 4-bit architecture, there ought to be some law here somewhere, is there? [closed]

I am trying to build the most simple CPU possible. And doing it on bread boards. There is a popular movement, one of the biggest protagonists of that being a certain Ben Eater, who is a good teacher, ...