Megaprocessor - built from individual transistors

[Pontus Pihlgren]

On Thu, Jun 25, 2015 at 04:16:03AM -0700, David Griffith wrote:
> 
> I don't think thatt making the flip-chips double-sided will be 
> desirable.  I want to shrink the machine and minimize any need 
> to reengineer the backplane.  By the way, can the backplane of 
> a straight-eight be realized as a PCB?  Replicating that 
> component without that will suck.  

I've not chosen that restriction and would not mind rerouting 
the backplane if it means 1. that I can shrink the design and 2. 
if it means I can fit it on a multilayer PCB of suitable size.

Now, I've looked at the backplane of a PDP-12 and it looks to be 
4 or 5 levels deep at the most and fairly "roomy". So, with my 
limited experience it doesn't seem impossible to recreate in a 4 
layer PCB. I'm not sure what would be a suitable edge connector 
though, that would probably dictate the size of the flip chips 
more than anything.

Please correct me if I'm talking complete bulls**t. This is all 
new to me.

/P