Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!thunder.mcrcim.mcgill.edu!snorkelwacker.mit.edu!think.com!zaphod.mps.ohio-state.edu!rpi!uupsi!sunic!dkuug!imada!micro From: micro@imada.dk (Klaus Pedersen) Newsgroups: comp.sys.atari.st.tech Subject: Re: Possible 68020 problem Keywords: 68020, 68030, 68040 Message-ID: <1991Jan22.223634.16987@imada.dk> Date: 22 Jan 91 22:36:34 GMT References: <9101151859.AA11212@sun.soe.clarkson.edu> <1991Jan21.115306.17458@ifi.uio.no> Sender: news@imada.dk (USENET News System) Organization: Dept. of Math. & Computer Science, Odense University, Denmark Lines: 17 jkr@ifi.uio.no (Johan Kristian Rosenvold) writes: > Are the chip register adresses defined as a negative offset from the top of > the addressable range or as the absolute address 00 FF FA 01 ? If think that the addresses is defined to be in the top of the memorymap eg. 0xFFFF_FA01, and that just happens to be in the reach for a negative short absolute addressing. But it should be a simple problem for the onchip MMU, to map the 24 bit addressing used by some programmers/compilers/assemblers to the full 32 bit on the TT. - Klaus >-- >K. Rosenvsold, jkr@ifi.uio.no / ...!{uunet,mcvax,sunic}!ifi.uio.no!jkr >Short signatures R cute.