Re: A86: on interrupt

To: assembly-86@lists.ticalc.org
Subject: Re: A86: on interrupt
From: the_laser@juno.com (Andy S Johnson)
Date: Mon, 30 Mar 1998 17:03:00 -0700
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
References: <199803301643.SAA17017@factorix.sdv.fr>
Reply-To: assembly-86@lists.ticalc.org


Do this:

_USER EQU $d48f
_BIT EQU 3
install:
   res _BIT,(iy+$23) ;turn user routine off so it won't get called by
                     ;accident before we're ready
   ld hl,user        ;copy prog to user buffer
   ld de,_USER+1
   ld bc,200
   ldir
   ld a,(_USER+1)    ;set up checksum byte
   ld hl,_USER+($28*1)
   add a,(hl)
   ld hl,_USER+($28*2)
   add a,(hl)
   ld hl,_USER+($28*3)
   add a,(hl)
   ld hl,_USER+($28*4)
   add a,(hl)
   ld hl,_USER+($28*5)
   add a,(hl)
   ld (_USER),a
   set _BIT,(iy+$23)  ;turn it on   
   ret
user:
   push af
   push bc
   push de
   push hl
;your program goes here
   pop hl
   pop de
   pop bc
   pop af
   ret

---
Andy Johnson
"Change is inevitable...
     except from vending machines"

On Mon, 30 Mar 1998 18:40:29 +0200 Scalp <Scalp@bigfoot.com> writes:
>
>can someone explain me how does the on interrupt work
>I think I can load my prog in user memory and set some flag, but I 
>don't
>know how...
>
>Thanx
>Nicolas
>
>

_____________________________________________________________________
You don't need to buy Internet access to use free Internet e-mail.
Get completely free e-mail from Juno at http://www.juno.com
Or call Juno at (800) 654-JUNO [654-5866]

Follow-Ups:

Re: A86: on interrupt

From: Brian Smith <subby@pcisys.net>

References:

A86: on interrupt

From: Scalp <Scalp@bigfoot.com>