I am sure you are right -- notice some of the odd angles and mixed 45/90s. Also notice the very poor registration of the holes to pads.
In the early 80's I was doing 8 mil lines & spaces, getting two traces between pads on .1" spacing. It was pushing the limit of the local board houses. It was also just the ticket for high speed memory boards for a couple decades, until the DDR stuff came along. Now 6 mil is considered large, 4 mil is the bottom size without paying for low yields. I still use 8 mil on boards that can afford it, from a density standpoint. Gold plating has been making a big comeback in recent years -- ENIG -- or electroless nickel immersion gold. It's a good finish for lead free solder. Almost everything I've done for 7 or 8 years now gets ENIG. At many board houses it's not even a premium cost adder. It's a soft finish -- not suitable for edge connectors. Terry On Wednesday, August 17, 2016 at 12:46:11 PM UTC-5, gregebert wrote: > > I'm certain it's a "tape-and-donuts" PCB layout. The first CAD-developed > PCB's I saw in the 1980's had telltale 45-degree bends everywhere, and > everything else was perfectly orthogonal. > > Notice there are no traces going between 0.1"-spaced pads, due to the > primitive manufacturing capabilities at that time. > Remember when they used to gold-plate everything ? Some were so thickly > plated they appeared to be solid gold. > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/6781acc4-fdb6-4139-b111-20e0303406ac%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
