Path: utzoo!utgpu!attcan!uunet!portal!cup.portal.com!thad
From: thad@cup.portal.com (Thad P Floryan)
Newsgroups: comp.sys.amiga
Subject: Re: Dungeon Master, updates.
Message-ID: <10401@cup.portal.com>
Date: 23 Oct 88 11:27:48 GMT
References: <6920@ut-emx.UUCP> <10094@cup.portal.com> <589@apctrc.UUCP> <10
Distribution: na
Organization: The Portal System (TM)
Lines: 29

Stephen Poole writes:
``
      I occasionally run into the same problem with some Mac software.  Self
      modifying code, if it fails on the 68020, is generally due to the
      instruction cache.  Have you tried disabling it and then running the
      offending software?  That solution has worked on at least two Mac
      packages that I've played with.
''

Though the following sequence serves to "reboot" the system (Amiga A1000) and
bypasses autoconfiguring of expansion RAM (for use with programs that don't
peacefully coexist with expansion memory):

	XREF	_AbsExecBase		* ptr to ptr to ExecBase
	XREF	_LVOSuperState		* offset for SuperState()

	movea.l	_AbsExecBase,a6		* get ptr to ExecBase
	jsr	_LVOSuperState(a6)	* do SuperState();
	jmp	$F80000			* jump to Amiga ROM start

	END

I haven't successfully managed to "boot" a game disk with the instruction
cache of an '020 disabled.  Some game programs (e.g. JET) can be started
manually from, say, DF1:, which permits one to disable the instruction cache
before starting the game, but ZOOM is not one of these.


Thad Floryan  [ thad@cup.portal.com (OR) ..!sun!portal!cup.portal.com!thad ]