10 Oct
2010
10 Oct
'10
12:18 p.m.
JP Hindin wrote:
I'm delving deeply into the manuals that came with
my IBM System/34 and in
the Core section it mentions that the logic is "VTL and Dutchess". TTL,
ECL, CMOS sure... but I've never heard of VTL or Dutchess, and Google
doesn't seem to be providing (although forest/trees problem exists).
Is this just another footnote in our history, does it go by another name,
or am I missing something important here?
As with most everything IBM did in that
era, they invented it
themselves, so no one else used it, and there is little or no documentation.
I'm not sure about VTL, but Dutchess was a specific generation of
bipolar gate array, containing up to 134 gates. It was basically
compatible with normal 5V TTL.