Path: utzoo!attcan!uunet!snorkelwacker!usc!ucselx!crash!jcs
From: jcs@crash.cts.com (John Schultz)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Bypassing the Audio Filter
Message-ID: <3519@crash.cts.com>
Date: 14 Jul 90 17:06:54 GMT
References: <90195.001845L98CC@CUNYVM.BITNET>
Organization: Crash TimeSharing, El Cajon, CA
Lines: 25

In article <90195.001845L98CC@CUNYVM.BITNET> L98CC@CUNYVM writes:
>Hello!
>   I want to write a program to turn off the hi-frequency filter on A500.
>I do know that setting a certain bit in certain address will turn it off.
>What is that address and bit?  But even better, is there a system call I can
  
  The address is hex BFE001. In assembly:

     bclr.b   #1,$BFE001   ; turns filter off (dims LED)

     bset.b   #1,$BFE001   ; turns on ...


  In C:

  unsigned char * filter = (unsigned char *)0xBFE001;

     *filter = (*filter) & 0xfe; /* Turn off */

     *filter = (*filter) | 1;    /* Turn on */
   


  John