Re: 1977 original apple II restoration (continued)...

["sicklittlemonkey" <Nick.Westgate@gmail.com>]

> So, now I'm stumped. Does anyone have any insights.

Perhaps someone else here can offer better insights based on the
symptoms, and certain frequenters of this group can most *definitely*
expand on my suggestion below.

You've popped the chips and jiggled things around ... it's time to find
out which subsystems are operating, and which aren't. You should buy a
cheap logic probe if you don't already have one, read a tutorial on
using it (which I presume you need to do, since you're asking for more
help) like this one here I googled up:
http://users.erols.com/mowerman/logicprobe.htm

Whether you want to play with this first on your original Apple II is
up to you, but I'd skill up on an expendable board first just to get
more comfortable. This isn't rocket science though, and you're pretty
unlikely to screw up boards using just a logic probe.

You know video of some kind is being output, so I'd start with the CPU.
Check the voltage, clock inputs, ensure RESbar is being pulled high
(likewise other interrupts), then see if any of the address lines are
toggling.

Your machine is not going "beep", so working back from the CPU will
eventually lead you to the subsystem that's stuck.

Cheers,
Nick.