An 80386 CPU S-100 Board

On Wed, Oct 17, 2012 at 8:36 PM, David Riley <fraveydank at gmail.com> wrote: I've done 0.5mm QFP manually with 100% success in the past (using the flux-and-drag technique) but it's very, very nice to have magnification for inspection for peace of mind. I managed to score a *free* used Brazilian knockoff Zeiss stereo microscope meant to be wall-mounted for a doctor's office and it's been really, really nice (in the past, I've borrowed a dissection microscope). Mine came with the light pipe and external light source, but if it gives me grief, I'll be building an LED ring. One thing I _don't_ like about it: the focal length off the bottom of the scope is 200mm. Yes. 200mm. Over 7". It means that I can barely reach items in the focal plane when I'm staring down the eyepieces. Fine for inspection. Not as fine for assembly. Optics are *not* my forte (worst grade I got in any science class in college was the physics class where optics were heavily featured), so I can follow instructions and install anything but I'm not likely to be able to calculate what needs to be changed. I'm definitely on the cusp of needing magnification for this fine-pitch work, so I'm happy I have this resource. Oh... I mentioned it's a wall-mount. I didn't get the wall plate or the arm, just the scope. I ended up hacking an office stool (with telescoping base) and replacing the chair back with an adapter plate so the scope mount fits into that and the subject sits on a wooden plate where the chair user used to sit. It's portable and since the chair was tossed out from upholstery wear, free! -ethan