Re: 911 Fatal Error on TransWarp GS?

[Rubywand <rubywand@swbell.net>]

Bryan Parkoff writes ...
> 
> 911 Fatal Error on TransWarp GS
> 
>     My Apple IIgs motherboard is ROM 01.  It has TransWarp GS with 32K cache
> board.  This 32K cache board is manufacturered by Applied Engineering since
> I upgraded from 8K to 32K.
>     I get 911 fatal error too often while I am working on AppleSoft BASIC,
> monitor machine, and GS/OS 6.0.1.  I turned off and turned on, but I still
> get the same error message.  It is turned off for least 30 minutes and then
> it turned on.  It is working, but get the same error message next couple
> minutes.
>     I switched three different Apple IIgs ROM 01 motherboards, but the error
> message continues to exist.  I believe that it has nothing wrong with three
> different motherboards.  It must have something wrong with TransWarp GS.  I
> used two different Zip GS on both motherboards and they operate fine with no
> problems.
>     Do you have idea why TransWarp GS might cause problems with 911 fatal
> error?  Please advise.
> 
> Bryan Parkoff
> BParkoff@satx.rr.com


     Running okay with a ZipGS does not necessarily clear the motherboard of
having a faulty ADB IC (e.g. the ADB GLU chip) unless you've done it under the
same conditions-- mainly, room temperature and cooling are the same.

Note: As far as I know, the faulty ADB chips appeared on only some ROM-00
motherboards. If a motherboard is an actual ROM-01 board (i.e. not an upgraded
ROM-00 board), then it is pretty unlikely to have a faulty ADB IC.

     A good test of the motherboard is to pull the TransWarp GS (and any other
heavy power sucker boards) and see if you still get 0911 errors.

     If the 0911 errors vanish, it is fairly likely that the problem is system
noise resulting from the load represented by the TransWarp GS in combination
with skimpy Power Supply leads and skimpy power traces going to the Slots. For
info on a fix, see ...

http://www.apple2.org.za/gswv/a2zine/gswv/IdidThePSmod.html

and Q&A 5-7 at ...

ftp://ground.ecn.uiowa.edu/apple2/Faqs/Csa2POWER.txt or
http://home.swbell.net/rubywand/Csa2POWER.html .



Rubywand