Forgotten PC History
Roy J. Tellason
rtellason at verizon.net
Fri Aug 8 20:58:13 CDT 2008
On Friday 08 August 2008 21:44, Eric Smith wrote:
> Roy J. Tellason wrote:
> > The other thing that I took some notice of was mention of an 18-pin chip
> > package as "recently developed" at one point in the story, and later on
> > the mention of the 40-pin package as being then available.
> The 18 pin-per-package limit claims regarding the 4004 and 8008 have
> been around for a long time, and I think they came from interviews with
> Intel's founders and/or early employees, but I think they're factually
> incorrect, at least as commonly stated.
> The 24-pin DIP was very well established by 1968, and was already used
> by TI at that time.
My first TTL databook was from TI, and I believe there was some small number
of 24-pin devices in there, like the 74154 and similar. (Hope I'm
remembering right here. :-)
> There were certainly higher pin-count packages at that time also. I'm not
> sure about the 40-pin DIP, but in 1969 Fairchild was shipping at least one
> memory chip in a 36-pin DIP, though that particular package never became
There were also those "flatpacks" which I never could figure out. A precursor
to surface mount? Something else?
> 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.
I guess a large part of it was the machinery to handle that stuff too,
besides the lead frames themselves. I don't know much about that stuff so I
don't know if any given production machinery would be adaptable to many
different sizes or if you'd need a different bigger machine to handle them.
If the latter was the case then I can see where they might be reluctant if
there weren't a lot of demand.
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
Information is more dangerous than cannon to a society ruled by lies. --James
More information about the cctalk