jdeitch@umiami.ir.miami.edu (Jonathan Deitch) (05/04/91)
Ok, I've got a tricky hardware problem that I just can't figure out : My //c works perfectly fine. It passes Apple's Apple II Diagnostics v3.0 without error, even when I set it to loop and let it run for a few hours. When I run IIGIF v1.0, and start to unpack a GIF picture, it gets a few lines into the picture and then the screen clears and "MMU" appears in the middle of the screen. Now I know this is supposed to mean that the MMU is bad, but nothing I can do can prove the MMU to be bad. I've even swapped the chip for a new one and it still goes bonkers. It's not anything in my system. I un- hooked everything and even took my memory card out. Then I tried four different versions of ProDOS 8. Then I tried a different download of the program. Nothing works. Anyone got any ideas ? I'm fresh out. thanks, - Jonathan ------------------------------------------------------------------------------ Internet : jdeitch@umiami.miami.edu | "Good musicians execute ------------------------------------------------- | their music but bad ones "I'm a Time Lord. I walk in eternity !" - Dr Who | murder it !!! "
mattd@Apple.COM (Matt Deatherage) (05/04/91)
In article <1991May3.195637.9581@umiami.ir.miami.edu> jdeitch@umiami.ir.miami.edu (Jonathan Deitch) writes: >Ok, I've got a tricky hardware problem that I just can't figure out : > >My //c works perfectly fine. It passes Apple's Apple II Diagnostics v3.0 >without error, even when I set it to loop and let it run for a few hours. > >When I run IIGIF v1.0, and start to unpack a GIF picture, it gets a few lines >into the picture and then the screen clears and "MMU" appears in the middle >of the screen. [...] IIGIF does a bad thing. It hits a $C02x softswitch that does something useful on a IIgs, but it does this on a IIc and IIe as well. This doesn't cause any problems on a IIe (unless you have a cassette player hooked up), but on the later IIc computers those addresses switch ROM banks, and the second ROM bank (totally undocumented) should never be switched in when a ROM call (or a $Cn00 call) is made. IIGIF doesn't know this, so after it switches the ROM banks it happily jumps into the middle of the built-in diagnostics when it thinks it's accessing a Monitor ROM routine. Ah, well. If you can find the offending $C02x access in the program you might be able to take it out. Otherwise you'll have to get the author to fix his program. -- ============================================================================ Matt Deatherage, Developer Technical | The opinions expressed herein are Support, Apple Computer, Inc. | not those of Apple Computer, and Personal mail only, please. Thanks. | shame on you for thinking otherwise. ============================================================================
V2071A@VM.TEMPLE.EDU ("George A. Piotrowski Jr.") (05/04/91)
On 4 May 91 02:12:31 GMT you said: > >IIGIF does a bad thing. It hits a $C02x softswitch that does something useful >on a IIgs, but it does this on a IIc and IIe as well. This doesn't cause >any problems on a IIe (unless you have a cassette player hooked up), but on >the later IIc computers those addresses switch ROM banks, and the second >ROM bank (totally undocumented) should never be switched in when a ROM call >(or a $Cn00 call) is made. > >IIGIF doesn't know this, so after it switches the ROM banks it happily jumps >into the middle of the built-in diagnostics when it thinks it's accessing >a Monitor ROM routine. Ah, well. > >If you can find the offending $C02x access in the program you might be able >to take it out. Otherwise you'll have to get the author to fix his program. > >-- >============================================================================ >Matt Deatherage, Developer Technical | The opinions expressed herein are >Support, Apple Computer, Inc. | not those of Apple Computer, and >Personal mail only, please. Thanks. | shame on you for thinking otherwise. >============================================================================ Matt, Is the diagnostics the only thing in that ROM bank? Just wondering.. I have seen some mention of Appletalk in the //c and saw your message so I thought I would ask. (I mean undocumented, you knew someone would ask:) Thanks, ________________________________________________________________________ George A. Piotrowski, Coordinator CREN/Bitnet: V2071A@TEMPLEVM Educational Computing Center Internet: v2071a@vm.temple.edu Temple University Internet: gap@picasso.ocis.temple.edu Philadelphia, PA 19122 AOL: GaPio AppleLink: PIOTROWSKI1 (215) 787-6228 CI$: 74046,1304 Genie: G.PIOTROWSKI Doc Brown: Obviously, the Time Continuum has been disrupted creating this New Temporal Event Sequence resulting in this Alternate Reality! ________________________________________________________________________ Acknowledge-To: <V2071A@VM.TEMPLE.EDU>
alfter@nevada.edu (SCOTT ALFTER) (05/05/91)
IIGIF does some strange things on my IIe. Probably the worst problem is that, once a conversion is done and you're looking at a finished screen, it toggles the cassette output while you look at the screen. This would be no problem if I didn't have a speaker hooked up to the cassette output for playing digitized sounds. With my current setup, IIGIF screams while it waits for you to press a key. This is very irritating, and I can think of no reason for this behavior. (Maybe I'll try to go into the program and kill the code that toggles the tape output.) Scott Alfter-----------------------------_/_---------------------------- Call the Skunk Works BBS (702) 896-2676 / v \ 6 PM-6 AM PT 300/1200/2400 Internet: alfter@uns-helios.nevada.edu ( ( Apple II: GEnie: S.ALFTER \_^_/ the power to be your best!
edwatkeys@pro-sol.cts.com (Ed Watkeys) (05/06/91)
In-Reply-To: message from jdeitch@umiami.ir.miami.edu Not that this is going to help you much, but the same thing happens to me on my IIc... It's a 3.5 ROM... Ed Watkeys III Internet: edwatkeys@pro-sol.cts.com ProLine: edwatkeys@pro-sol UUCP: crash!pro-sol!edwatkeys ARPA: crash!pro-sol!edwatkeys@nosc.mil BitNET: edwatkeys%pro-sol.cts.com@nosc.mil
axi0349@isc.rit.edu (A.X. Ivasyuk ) (05/06/91)
I was fortunate enough to catch the author of IIGIF at one of those
electronic CB conferences, I believe it was on either Compu$erve or GEnie.
Anyway, I had the same problem and he told me of a fix. This was about
two years back. I believe there is an updated version of IIGIF (1.1?) and
a patch to prevent the C02? error on the //c and stuff. I got a copy off
APPLE2-L after one of my floppies literally fell apart. I believe you can
also get it at Apple-supporting FTP archive sites. Try tybalt.caltech.edu
for one. If I have time between classes this week, I'll try to upload a
copy to comp.binaries.apple2.
-Anatole
--
Anatoly Ivasyuk @ Computer Science House @ Rochester Institute of Technolgy
(anatoly@ritcsh.csh.rit.edu) || (axi0349@ultb.isc.rit.edu)