Re: My Apple ][+ is now very, very sad...

[Tristan Mumford <xtristan.xmumford@xgmail.xcom>]

Michael J. Mahon wrote:

> John wrote:
<snip>
> Originally, it was thought that ICs would have a "bathtub shaped"
> failure rate curve, but data indicates that the "end of life"
> upswing isn't there--at least for values several times their
> predicted lifetimes.

So true. Especially when the ICs are powered by a nice reliable power supply
free of spikes and other anomalies.
Speaking of which I wonder how healthy the -5v rail is on the ailing II+
power supply.

Call me mad if you will, but does anyone else see the pattern of horizontal
offsets and shades on the screen. I don't think enough is being read into
that. I haven't studied the schematics too closely (even though I do need
to, to resurrect an ailing II+ Clone). It could be anything from something
obtuse like one of the MSB bits on a counter shorting to earth to a
marginal supply being overloaded by too many active gates at one time.

I know I'm not being too helpful, but a few more suggestions into the mix
couldn't hurt.

To the OP: If you happen to have the spreadsheet of components etc. still,
could I please get a copy from you? My e-mail is
xtristan_d0t_xmumford_at_xgmail_d0t_xcom with 'x's removed and punctuation
substituted of course :)

Tristan.

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