4004 and IC history / was Re: Vintage computer photogallery

[dwight elvey]

> Date: Sat, 13 Oct 2007 14:40:34 -0400> From: rtellason at verizon.net> To: cctalk at classiccmp.org> Subject: Re: 4004 and IC history / was Re: Vintage computer photogallery> > On Saturday 13 October 2007 05:13, Brent Hilpert wrote:> > Can't remember where I read it, but it seemed plausible for the time the> > 4004 was being developed (1970), also that it was compounded by> > management's perceptions that the 4004 was a little business on the side> > and not willing to invest much in it, memory chips still being the focus.> > On the other hand, I wonder what packages the original Busicom designs> > utilised - that Intel would otherwise have been obligated to produce - one> > would expect, or typically, they would be larger. (The 4040 would go to a> > larger package, of course.)> > Having heard of the 4004 of course, I know basically nothing about it. > Except that it's the part that was supposed to have started all this... And > the 4040? I've only seen mention of it now and then.
 
 Hi
 The 4040 was just an expanded 4004. It had more addressing range.
It was used in the universal prom programmer. Each personality card
would have the electronics to program a specific part and a couple
4001 ROM chips to handle I/O and specific code.
> > (Snip)> > Perhaps not speed as an issue but you were wired into the small family of> > chips that understood the highly specific machine/bus cycle, at least> > until the 4008/9 came along that broke out the address/data busses.> > 4008/9? First I've heard of these at all.
 
 These were but interface chips that took the pmos levels and convertered
then to TTL levels to use with standard RAM, ROM, EPROM and I/O. They
included the needed mux decoders and the needed instruction monitors
to know when to read or write onto the bus.
 These two were replaced later by a single chip ( 42?? ) that did the
same fuctions.
 The 4004 family included:
  4004 CPU
  4001 ROM I/O
  4002 RAM Output
  4003 Shift reg output
  4008/9 Interface
  and a couple others I forget.
 
Dwight
 
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