Re: Help diagnose dead //e?

[Wayne Stewart <waynejstewart@gmail.com>]

As Michael said, it can't be your oscillator. A dead oscillator would
leave you with no video whatsoever.
Any chance the processor might be in backwards, one pin off or with a
bent leg? Years ago when I was bored, I tried starting a IIe with a
single socketed chip removed to see what the results were. The only
thing that matched your picture was when the processor was absent. Of
course there are a lot of chips soldered in too.

On Jul 20, 6:31 pm, Brian Bernstein <brian.bernst...@gmail.com> wrote:
> On Jul 17, 10:36 pm, Wayne Stewart <waynejstew...@gmail.com> wrote:
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> > Your picture is exactly what you get if you have no processor
> > installed. You likely need a replacement 65C02 but you could check to
> > see if the Rocketchip isn't loose. Maybe it wasn't fully seated when
> > installed and has worked it's way loose.
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> > On Jul 17, 6:01 pm, Brian Bernstein <brian.bernst...@gmail.com> wrote:
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> > > I recently pulled my old Apple //e out of storage and the three shoe boxes of disks to archive data via ADT. Everything worked great until I left it running unattended for 3 hours. It looked frozen and Control-Reset wouldn't do anything.
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> > > It seems like the machine was freezing up but is now frozen. After the first failure, I was able to turn off the machine for a bit and then it'd work for a bit, but then it'd freeze again. Sometimes I'd see the "Apple //e" boot banner but nothing, or just a blank screen. Sometimes I'd get to a prompt and it'd blink a while and then the cursor would just freeze. Now when I turn it on, I just get a strange pattern on the screen (see link)
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> > >http://dronefone.com/nntp/dead2e.jpg
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> > > Before I start pulling lots of things out, a few thoughts:
> > > 1. It was plugged in through the old Kensington System Saver. No reason to think it is failed, but this should protect against minor power spikes. It had this for years.
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> > > 2. It has a 5MHz RocketChip accelerator (direct 65C02 replacement). It was on fast mode at the time. I don't think heat was ever an issue with this machine. However, perhaps it fried and the pattern is what a //e would do if it had no CPU installed?
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> > > 3. It had all 8 (7+aux) slots populated. Removed a Micromodem ][ and a serial card and it didn't make a difference.
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> > > 4. ADTpro was connected using a SSC clone (simply labeled "Serial //" but obviously has SSC ROM since "IN#2 / Ctrl-A" reports "APPLE SSC:"). This card has worked FINE for years, but even after removing it and dropping it into my IIgs it hasn't worked again.
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> > > I'm thinking it is either the power supply or Rocketchip. Not wanting to swap parts out just yet, but I figure the screen shot would help.
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> > > Any ideas? I really want to get my old friend working again!
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> > > thanks!
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> I gave it a shot tonight and replaced the Rocketchip with the original
> 65C02. No luck.
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> A thought... any chance maybe the clock crystal could freeze or go
> bad? I'm just thinking this could have happened since it did work last
> week and then would just freeze after a period of time (shorter and
> shorter periods each time until it stopped working altogether). I
> could probably hunt the internet for a schematic to figure out where
> the main clock crystal is, but any tips would be helpful :)