Peter wrote:Dave wrote:My PCB maker does castellated PCBs for no extra cost. Tech has come along way.
How would you specify that? Just let the board outline cut through pads and write "castellated PCB" in your description text file?
What surface material would they use then?
In this application, I would just put the edge cut lines across PTHs in a whole panel of these, yes. You could use the same board for two PLCC sockets and use them as a standard riser. You could go for tinned or gold plated. I personally would spring for the plating, to prevent tarnish build up. Since the Qx0 is a 21 years ago respin of a 35 years ago design, there's an actual chance it'll get handed down through the generations.
Peter wrote:Dave wrote:It would certainly seem that making more QX0 PCBs, but with just an extra header or two with some vital signals brought out would bring extended capabilities well into the future.
Maybe. Probably only if someone designs a new video card also. I'm uncertain about the whole 68060 or "high end" issue.
Watching my personal usage, the Q68 is so neat that I fire up my Q60 less often. The 68060 is less compatible for old software and games than the Q68. And when I need high speed as a tool, e.g. to compile large sources, the PC is faster these days.
Also what to do with the existing Q40 and Q60 boards? Just rip out the socketed chips and ditch?
It strikes me that besides a few passives and a CPLD, you're already close to replacing/updating the whole machine.