Clock speed of the 4004?

From: Allison J Parent <>
Date: Sun May 17 16:47:12 1998

<Anyone know what the clock speed of the 4004 is? Courson's web page
<mentions it not.

I'd guess around 500khz (typical for silicone gate Pmos) but the published
instruction cycle time is 10.8uS(likely a trivial register move). It took
something like 4-5 clock cycles to get an instruction cycle minimum as
address (4bits at a time were output) and instruction was input the same
way. Instruction could and did take several cycles so this CPU was NOT
fast. ;)

Received on Sun May 17 1998 - 16:47:12 BST

This archive was generated by hypermail 2.3.0 : Fri Oct 10 2014 - 23:31:12 BST