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
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]>. >
