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Re: 65c816 in a IIc

gids.rs@sasktel.net wrote:

The clock also has a 20-year autorecharging battery. So I guess these
batteries just started failing now.



My battery was leaking and starting to corrode the leads, so I removed
it.  But even after I removed it, I could still set the clock to any
time I want and it would start counting from that time.  It worked
like this for a couple of weeks and the computer was being shut down
every night.  Then I started playing with a 65c02-14 chip that I got
and the computer hung every time on startup.  I gave up and replaced
the original 65c02 but now I can't even set the clock any more.  Only
the seconds and minutes remember what I entered, but they don't count
up, and the hours counter counts up randomly by 5-7 hours which makes
the days count up rapidly.  I might try reinstalling a battery to see
if that will calm down the counters.  But who knows.

Rob


Remarkable.  It sounds like the clock chip is either 1) in need of a
reset, or 2) zapped.  (These CMOS chips are very low power, which has
the side effect of making them especially susceptible to ESD from a
stray touch.)

To test the "reset" theory, try turning off the machine for at least
a day, then turning it on and setting the date and time again.  (If any
stray bits find their way into the BCD registers, these chips can count
in strange ways.)

-michael

NadaNet and AppleCrate II: parallel computing for Apple II computers!
Home page: http://home.comcast.net/~mjmahon

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