10 Aug
2008
10 Aug
'08
11:37 p.m.
On Fri, 8 Aug 2008, dwight elvey wrote:
The 8008 was only introduced a year after the 4004 which was
introduced in 1971. I can't find a pin out for either of them
but I suspect that they might be pin compatable so that the
upper four bits would be simply not used if the 8008 was put
in a system designed for a 4004. They were used mostly in
industrial control systems according to my college text of
only slightly later.
Unlike the 8080 and later, they used PMOS logic and multiplexed
addressing. I cannot find a pin out or instruction set.
Oh, the 8008 had 48 instructions as opposed to 78 for the 8080
family.
bs
From: eric at brouhaha.com
---snip--->
Possibly whatever specific company Intel was
contracting with to supply
lead frames and ceramic packages didn't yet offer higher pin count
packages, but they obviously were available from some vendors since
other semiconductor companies like Fairchild and TI were using them.
Eric
Hi
My understanding was that Intel wasn't using them and they
didn't expect to sell enough uP chips to make it practical to use
a larger size. Later designs did use more pins.
Dwight
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