Article View: comp.sys.amiga.tech
Article #4480Re: Bypassing the Audio Filter
From: Alex Matulich
Date: Fri, 20 Jul 1990 20:20
Date: Fri, 20 Jul 1990 20:20
26 lines
1440 bytes
1440 bytes
In article <3519@crash.cts.com> jcs@crash.cts.com (John Schultz) writes:
>In article <90195.001845L98CC@CUNYVM.BITNET> L98CC@CUNYVM writes:
>> 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
>
> In C:
> unsigned char * filter = (unsigned char *)0xBFE001;
> *filter = (*filter) & 0xfe; /* Turn off */
> *filter = (*filter) | 1; /* Turn on */
No, NO! You only need to switch the second bit!
For example, to toggle the bit on and off, you would say,
*filter ^= 2;
You shouldn't mess with the other bits... you don't know what they
might be for!
--
/// Alex Matulich
/// Unicorn Research Corp, 4621 N Landmark Dr, Orlando, FL 32817
\\\/// alex@bilver.UUCP ...uunet!tarpit!bilver!alex
\XX/ From BitNet try: IN%"bilver!alex@uunet.uu.net"
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<826@bilver.UUCP>Path:
arc1-ca.pugleaf.net!utzoo!utgpu!watserv1!watmath!att!rutgers!usc!zaphod.mps.ohio-state.edu!rpi!crdgw1!ge-dab!tarpit!bilver!alexReferences:
<90195.001845L98CC@CUNYVM.BITNET> <3519@crash.cts.com>Show Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!watserv1!watmath!att!rutgers!usc!zaphod.mps.ohio-state.edu!rpi!crdgw1!ge-dab!tarpit!bilver!alex From: alex@bilver.UUCP (Alex Matulich) Newsgroups: comp.sys.amiga.tech Subject: Re: Bypassing the Audio Filter Message-ID: <826@bilver.UUCP> Date: 20 Jul 90 20:20:45 GMT References: <90195.001845L98CC@CUNYVM.BITNET> <3519@crash.cts.com> Reply-To: alex@bilver.UUCP (Alex Matulich) Organization: W. J. Vermillion, Winter Park, FL Lines: 26