what's the world's biggest circuit/motherboard?

[Jules Richardson]

Andy Holt wrote:
> I think the largest PCB I've seen is that for the Whitechapel workstation

Seconded. The Acorn M4 board is around the same size - I should compare 
them sometime and see which is the larger.

> I suppose some old mainframes might have their entire "engineers panel" on
> one PCB.

It doesn't 'feel' right counting those somehow though. Maybe to qualify 
it should be a self-contained board with CPU/mem/IO (mind you, the O/P 
asked about *homebrew* boards I believe, not commercial :-)

Either way, that'd rule out such as my NCR Tower (main board is about 1m 
x 30cm, so poss. bigger than the Whitechapel in surface area - but the 
memory and IO are all on seperate cards via a backplane) which is 
reasonably impressive (the main board is at least twice as thick as the 
average PCB too)

> I suspect that very few boards were made that are wider than a standard 19"
> rack.

Not sure, but above a certain size there are handling issues. I presume 
it wouldn't take much to break tracks due to flexing on larger boards.

cheers

Jules