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

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

Hi Phil.

Looking at your original post again, it is very strange that your
original problem restored itself *only* when you replaced the original
RAM. If the stack RAM was hosed, the CPU might spin endlessly, but with
either set of RAM, there was no beep right?

So RAM is likely fine as Michael suggests - the CPU is not getting
something it needs. You've swapped everything once, so if you're going
to do it again, start with Michael's suggestions below (currently post
#10) and perhaps do the continuity tests while you're doing the swaps.

After that, honestly, a logic probe (which is much simpler and cheaper
than a scope - we're talking less than $20 back in NZ, 3000 Yen at most
here, surely) is really easy to use. You just poke it somewhere, like
the CPU's reset pin, and it tells you if it's high (~+5V) or low (~0V)
or oscillating.

Cheers,
Nick.