Re: A89: disabling interrupt 1

Re: A89: disabling interrupt 1

• To: assembly-89@lists.ticalc.org
• Subject: Re: A89: disabling interrupt 1
• From: Zoltan Kocsi <zoltan@bendor.com.au>
• Date: Tue, 19 Oct 1999 09:37:55 +1000 (EST)
• In-Reply-To: <003a01bf1997$6b92c480$0201a8c0@sparta.lu.se>
• References: <0.931b1f46.253cbee2@aol.com> <003a01bf1997$6b92c480$0201a8c0@sparta.lu.se>
• Reply-To: assembly-89@lists.ticalc.org

 > If you always restore the SR to the same value (like $2000) then you can simply
 > put that value in d0 before calling trap 1 again.
 > trap #1 alters the sr to the value in d0 (or at least parts of it).

If that is so, then once you have altered it into $2000, you can
freely write to it (i.e. you don't need the trap #1 stuff) because
this bit (the $2000) is the supervisor mode bit.

Regards,

Zoltan

• Re: A89: disabling interrupt 1
• From: "Niklas Brunlid" <e96nbr@efd.lth.se>

• Re: A89: disabling interrupt 1
• From: TurboSoft@aol.com
• Re: A89: disabling interrupt 1
• From: "Niklas Brunlid" <e96nbr@efd.lth.se>

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