On Thu, 2025-09-04 at 14:55 -0400, Bill Degnan via cctalk wrote: > I think the point here is that the Type 512A and the Type 518 are not > commercial products and appear to have been made specifically for the > ENIAC. Looking for confirmation of that hypothesis. The 13 and 19 > dimensions are not the same as the 12A and 18 respectively. > Bill
Sure, but both organizations might have information about the machines that interest you, even if they don't have instances of them. > > On Thu, Sep 4, 2025 at 2:46 PM Van Snyder via cctalk > <[email protected]> > wrote: > > > On Thu, 2025-09-04 at 11:35 +0100, David Wade via cctalk wrote: > > > > I'm looking for some information on a couple of the early > > > > IBM unit record devices, in particular the Type 512A and > > > > the Type 518. Ideally, I'd like to get the mechanical > > > > dimensions in enough detail to create a CAD model. > > > > > > As I assume you are aware, but perhaps others on here are not, > > > that > > > these pre-date computing and must come from the era when data > > > processing > > > involved only punched cards and I feel well before the term "Unit > > > Record" was coined. Sadly, this seems to be a forgotten era and > > > there > > > is > > > very little information about it on the web. > > > > The Computer History Museum in Mountain View, CA has a 519. They > > might > > have other models as well, or information about them. Contact Dag > > Spicer <[email protected]>. > > > > Haus zur Geschichte der IBM Datenvararbeitung (House of the History > > of > > IBM Data Processing) had a large collection in what had been a > > punch- > > card factory in Sindelfingen, a suburb of Stuttgart. They had a > > 650, > > 1401, and 360\25 in working order. IBM sold the building and moved > > the > > collection to the IBM technology center across the autobahn in > > Böblingen. I don't know how much of the collection they retained. > > Contact Hans Spengler <[email protected]>, Werner Seebode > > <[email protected]>, or Heinz Oberle <[email protected]>. > >
