Re: IIgs problem...

[dempson@actrix.gen.nz (David Empson)]

Labelas Enoreth <labelas@hotmail.com> wrote:

> Um, I'm not sure now if it posted correctly, did my message about the IIgs
> crashing with a Fatal Error $0682 whenever I tried to access the control
> panel, and Alternate Display mode (which seems to be missing)...and that
> stuff won't boot?

Didn't see anything about that, but I did see your earlier article which
mentioned problems when an Apple memory expansion card is installed.  I
assume this is the same machine?

Error $0682 indicates a data structure maintained by the Event Manager
is corrupted.  It is either the Event Queue itself, or something related
to it.

The most common cause for this is buggy software which has overwritten
memory.

The second most common cause is a faulty memory expansion card (or bad
RAM on that card).  The event queue normally lives near the top of
"fast" memory, so it is always located in the memory expansion card if
you have one.

Similarly, the list of items in the Desk Accessories menu is in RAM, so
lack of Alternate Display Mode points to memory corruption of some kind.

> Anyone have any ideas on this? the IIgs passes the self test...

The self test does not test the memory expansion card, only the
motherboard memory, so my guess is that the card or its RAM is faulty.

I saw in the earlier article that you mentioned 41256-15 RAM from a IIe.
In theory, this should be OK on a IIgs.  150 ns RAM is the slowest type
that can be used in the IIgs, assuming the card is able to handle it.
Many cards use 120 ns RAM (or faster) to improve the timings.

I doubt this is a problem here, as the Apple card appears to use 150 ns
RAM normally.

Do you know if the RAM in question works OK?  Can you put it back in the
IIe card and run its self-test?

If that passes, I'd suspect the card itself.
-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand