Core memory emulator using non volatile ram.

Rod G8DGR rodsmallwood52 at
Sun Dec 16 11:42:30 CST 2018

Sent from Mail for Windows 10

From: Jon Elson via cctech
Sent: 16 December 2018 16:43
To: Rod G8DGR; General at; Discussion at Posts
Subject: Re: Core memory emulator using non volatile ram.

On 12/15/2018 11:19 PM, Rod G8DGR via cctech wrote:
> However I began to think would it be possible to create a close copy of an  8/e out of  modern parts.
> Finally the big one – Omnibus and the connectors its made from. A 3D printing candidate?
> I’m going to autopsy a busted connector and see how they are constructed inside.
Yup, this will be a problem.  A couple decades ago, there 
was a very common technology, press-fit backplanes.  You 
made a PC board with all the interconnect on it (power + 
signals) and pressed-in contact fingers.  Then, connector 
housings were pressed onto the contacts. I don't know if 
anybody still makes these contacts.  It would be hugely 
expensive to have custom ones made, but if they are still 
being made they might not be too bad.  I'm not sure 
3D-printed housings would be strong enough for this, but 
maybe if ABS they would.  Of course, there might actually 
still be somebody making clones of the DEC connectors.  They 
used basically the same design for PDP-8, PDP-11, KL10, VAX, 
etc.  Certainly, there were people cloning them back in the 
1980's.  Winchester made the official ones for DEC.
> Objectives
> The basic board set as original. M8300, M8310, M8320 etc.
> Same form factor
> Plug compatible – but board contents can differ from original
Well, this could all be done with one FPGA, but if you want 
to do each PC board separately, a modest CPLD or small FPGA 
would certainly do each board's functionality.


TTL I understand. FPGA  ==  Black Magic and Snake OiI to me.


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