> > > > > Mask ROMs do go bad - a non-trivial percentage of bad dumps in MAME are
> masks.
> > > >
> > > > They can go bad (under extreme circumstances), but something tells me that an
> > even
> > > > less trivial percentage of that non trivial percentage are caused by pins
> issues
> > >
> > > No, chips actually do go bad even if they don't rely on trapped charge. Oxide
> > layers
> > > in any kind of MOS will eventually degrade, doped silicon isn't perfectly stable
> so
> > > semiconductor junction transistors will go bad one day, Schottky barriers will
> > > eventually contaminate. Chips built on larger processes and with thicker oxide
> > layers
> > > will last longer, but none of them will last forever.
> >
> > And why do you start your post with "No" only to repeat what I said?
>
> because what he listed are not "extreme circumstances"?
If decades of time passing by are not extreme circumstances, then what is? 
He's basically saying they won't last forever, but what in this world lasts forever? That was a pretty silly statement.
I am talking from my dumping experience anyway, I have dumped several thousands of ass old mask roms and 100% of the bad dumps were bad pins/connections. It's not rocket science.
Edited by ReadOnly (12/20/12 07:58 PM)
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