The rarest 4004s are the grey trace with a black dot, instead of the gold dot for pin one. I have two grey trace but with gold dot. I believe these are older than the grey trace with black dot. Although, as originally sold, the 4004 was a Harvard architecture, it could be made to be, easily, made to be a von Neumann machine with either a 4008/4009 set or a 4289. I don't know if that was ever done, other than for the Mod 4 development machine. The 4004 had no interrupt but the later 4040 did. Dwight
________________________________ From: cctalk <cctalk-boun...@classiccmp.org> on behalf of Christian Corti via cctalk <cctalk@classiccmp.org> Sent: Wednesday, November 17, 2021 7:45 AM To: General Discussion: On-Topic and Off-Topic Posts <cctalk@classiccmp.org> Subject: Re: Intel 4004 turns 50 On Tue, 16 Nov 2021, ED SHARPE wrote: > The two contenders on tside leading g to the gold caphis question are > white and Gold 4004. And. The white and gold with leads showing through > in the white material i And now in English, please! Christian
