A89: Re: FYI: added info to J89hw.txt
[Prev][Next][Index][Thread]
A89: Re: FYI: added info to J89hw.txt
cool documentation!
a question about the following code:
Trap_11
lea $1C5EA4,a0 ; Pointer to scratch word variable "+ $1C0000"
bclr #1,$600015 ; Disable OSC2 (otherwise the LCD might interfere
; by doing RAM accesses in between!)
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)
nop ; And do it all again, just to be sure!
nop
nop
move.w #$2700,sr
move.w d0,(a0)
bset #1,$600015 ; Finally reenable OSC2
;...
;trap #11 handler continues here
;...
where are the three reads from 20xxxx or 21xxxx that should be done just
before
move.w d0,(a0) ?
Jeremie Knusel
----- Original Message -----
From: "Johan" <johei804@student.liu.se>
To: <assembly-89@lists.ticalc.org>
Sent: Monday, August 07, 2000 4:45 PM
Subject: A89: FYI: added info to J89hw.txt
>
> ...just wanted to mention that I've added misc stuff, including the
missing
> "protection" info, to http://m101.ryd.student.liu.se/J89hw.txt
> Nothing fancy, just for completeness. You probably know most of it
already.
>
>
> /Johan "100 bytes is enough."
>
Follow-Ups:
References: