> On Jun 25, 2015, at 7:16 AM, David Griffith <d...@661.org> 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?
Of course. The only reason a PCB backplane would be an issue is if there are
signal integrity concerns, but at DEC speeds that’s not going to be a problem.
Especially if what you’re aiming to replace is wire wrap which is in general
worse at signal integrity than PCB. Now if you were looking to replace the
chassis wiring of a 6600 with a PCB, that would be a different matter, then
you’d want to be a bit more cautious. Even then it’s clearly doable, if you
use transmission line design on the PCB signals.
paul
