Re: A89: Re: FYI: added info to J89hw.txt
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Re: A89: Re: FYI: added info to J89hw.txt
ok thanks
but doesn't the move to sr count for one read too?
and so unlocking isn't possible when executing a normal program (a program
which code is not located at 20xxxx or 21xxxx)...
when I read "read" I understood that I should do sth like:
move $20xxxx,x
move $20xxxx,x
move $20xxxx,x
but if the reading of the move instuction itself counts as a read...
so the validity of this method depends a lot of the ams version ?
Jeremie Knusel
----- Original Message -----
From: "Olle Hedman" <oh@hem.passagen.se>
To: <assembly-89@lists.ticalc.org>
Sent: Tuesday, August 08, 2000 5:30 PM
Subject: Re: A89: Re: FYI: added info to J89hw.txt
>
> Jeremie Knusel wrote:
> > nop ; Execute three NOPs to make SURE it's
actually
> > nop ; three read accesses from within $21xxxx
> > nop
> > move.w #$2700,sr ; "make sure nobody's trying to do stupid things"
> > move.w d0,(a0) ; Do the $1Cxxxx write (any value in D0 will do)
> >
> > where are the three reads from 20xxxx or 21xxxx that should be done just
> > before
> > move.w d0,(a0) ?
>
> The three nops. The code is run from somewhere in 20xxxx to 21xxxx and the
reads
> are the instruction fetches.
>
> file://Olle
>
References: