Wagner WAC40

[Tony Aiuto]

Joshua: I have one of those too. They do make a great display piece. If you
collect any information off list, I would love to hear it.


On Sun, Mar 14, 2021 at 11:20 AM Paul Koning via cctalk <
cctalk at classiccmp.org> wrote:

>
>
> > On Mar 13, 2021, at 1:34 PM, Joshua Rice via cctalk <
> cctalk at classiccmp.org> wrote:
> >
> >
> >> Very interesting looking.  I can't quite make out what is going on in
> that rectangular area where all the wires terminate, labeled 0-15 and A-R.
> Are there diodes there?  Anything on the other side of that board?
> >
> > Nothing but traces on the other side, though you’re right on them being
> diodes.
> >
> >> The large cores with all the wires are remisniscent of core rope ROM.
>  If so, I wonder if it's AGC (Lincoln Labs) style, EL-X1 style, or a scheme
> different from either of those two.
> >
> > It’s definitely some form of core rope ROM.
> >
> > Interestingly, the ferrite rings are built in pairs, with a "selection"
> coil wrapped around both, joining them. Therefore (i assume, i’m really no
> expert) they’ll be a positive pulse induced when passing through one coil,
> but a negative pulse when passed through the opposite coil. This probably
> helps in differentiating beween a 0, a 1, or a NULL state (ie 0v).
> >
> > I have no idea if that correlates with any particular format of Core
> Rope, but as far as my eyes can tell, that’  how the core rope is woven and
> functions.
>
> The key component of core rope memory (and X1 ROM) is square-loop cores,
> like the cores used in conventional read/write core memory.
>
> There is another kind of core ROM where the cores are simply transformer
> cores.  Since you mentioned a "selection" coil, chances are that's what
> we're dealing with here.
>
> Brent Hilpert has a great writeup on a number of the technologies used.
> http://madrona.ca/e/corerope/index.html
>
>         paul
>
>