10 Oct
2010
10 Oct
'10
3:14 p.m.
Greetings;
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?
Thanks all;
- JP
10 Oct
10 Oct
3:18 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.
4:03 p.m.
Eric Smith wrote:
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.
IBM *does* tend to do things differently, but they *do* document the
hell out of everything. The trick is finding the documentation, and
sometimes it can cost a goodly chunk of change.
Peace... Sridhar
5:07 p.m.
On 10 Oct 2010 at 16:03, Sridhar Ayengar wrote:
Eric Smith wrote:
I seem to recall that "VTL" is an acronym for "variable threshold
logic" and dates back at least to the 1960s.
--Chuck
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.
IBM *does* tend to do things differently, but they *do* document the
hell out of everything. The trick is finding the documentation, and
sometimes it can cost a goodly chunk of change. 
10:22 p.m.
On Sun, Oct 10, 2010 at 3:14 PM, JP Hindin <jplist2008 at kiwigeek.com> wrote:
I'm delving deeply into the manuals that came with my IBM System/34
I have a System/34 in my garage that has the first disk functional and the
second disk has a thrown belt. I have a new belt, but haven't tried to
install it.
I have pretty much a complete set of documentation for the IBM System/34.
I sent a part of the software documents to the CHM for scanning, but I
retained all of the hardware stuff.
-chuck
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