Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!att!ucbvax!VM.TEMPLE.EDU!V2071A From: V2071A@VM.TEMPLE.EDU ("George A. Piotrowski Jr.") Newsgroups: comp.sys.apple2 Subject: Re: //c GIF problems Message-ID: <9105040510.AA07568@apple.com> Date: 4 May 91 06:02:53 GMT Sender: daemon@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 42 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: