Help me get my childhood Apple //e running again

[Tom Moertel <tmoertel@gmail.com>]

When I read the recent Wired story about recovering the original Apple 2 source code for Prince of Persia, alarm bells sounded in my head.  I was sitting on a bunch of old 5.25-inch floppies, many containing programs I had written as a kid, and they were rapidly fading away.  If I wanted to save them, now was the time.

So I called up my parents and asked if they still had my old Apple //e in storage.  And they did!  So I met with them one evening and picked it up.

When I got home, I couldn't wait to unbox it.  Here are some photos:

https://plus.google.com/photos/103957126301745359889/albums/5735897279553029889


After I got everything set up, I flipped the switch.  For the first time in nearly three decades, I heard the familiar beep and the Disk II's ker-chunka-chunka-chunka recalibration.  It was exciting!  But then I discovered that something was wrong.

When I tried booting from a ProDOS disk, I got a relocation error.  And then when I tried other DOS 3.3 disks, the programs on them would seem to load but then fail.  When I tried a program that displayed HiRes graphics, I could see some vertical glitches on the screen.

Darn!

It's a //e enhanced, so I tried the built-in diagnostic.  The problem is, I seem to be getting unreliable results.  Sometimes, when I power on with the open and closed Apple buttons held, the diagnostic never completes.  When it does complete, I get differing results.  So far I've gotten these results:

    RAM      1 0 1 0 1 0 0 0

    RAM      3 1 3 0 2 0 3 0

    RAM ZP   0 0 0 0 0 0 1 0

The last one I seem to get more frequently.

Any ideas about how I can figure out what's really wrong and fix it?  Here's what I have:

* My original enhanced //e (upgraded from a ][+)
* A spare //e I picked up for parts (doesn't work)
* Extended 80 col card
* RAMWORKS 512K card
* Two Disk II drives and controller card
* Super Serial Card
* Monitor ///

Both computers have socketed RAM, not soldered-in RAM.

Thanks for any help and/or pointers you can provide.

Cheers,
Tom