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Questions tagged [intel-4004]

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22 votes
3 answers

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 ...
Noob_Guy's user avatar
  • 693
15 votes
2 answers

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 ...
Patrick LeBoutillier's user avatar
12 votes
1 answer

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) ...
DrSheldon's user avatar
  • 16k
7 votes
5 answers

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, ...
Gunther Schadow's user avatar
2 votes
2 answers

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 ...
Nip Dip's user avatar
  • 341