From echoi@inria.fr Mon Jan 09 22:41:45 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!inria!echoi
From: echoi@inria.fr (Emi Choi)
Newsgroups: comp.sys.m68k
Subject: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jan09.224145.3800@inria.fr>
Date: Mon, 09 Jan 1995 22:41:45 GMT
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Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.

When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization!
I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz.

Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames!

-- 
Emi Choi | echoi@inria.fr
PGP Key fingerprint: 2DF5 EF68 2DEC C3C0
"Keep the channels open."

From mperez@rwth-aachen.de Tue Jan 10 01:49:45 1995
Path: ashpoly!cascade!brgate!saturno!rwth-aachen!mperez
From: mperez@rwth-aachen.de (Marta Pérez)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jan10.014945.4730@rwth-aachen.de>
Date: Tue, 10 Jan 1995 01:49:45 GMT
References: <1995Jan09.224145.3800@inria.fr>
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In article <1995Jan09.224145.3800@inria.fr>, echoi@inria.fr (Emi Choi) writes:
> Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.
> When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization!

Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom.

-- 
Marta Pérez
Opinions expressed are solely my own and not those of RWTH Aachen Informatik.
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From hmartinez@pacbell.net Wed Jan 11 00:17:45 1995
Path: ashpoly!cascade!bigsur!pacbell!hmartinez
From: hmartinez@pacbell.net (Heather Martínez)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jan11.001745.7408@pacbell.net>
Date: Wed, 11 Jan 1995 00:17:45 GMT
References: <1995Jan09.224145.3800@inria.fr> <1995Jan10.014945.4730@rwth-aachen.de>
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In article <1995Jan10.014945.4730@rwth-aachen.de>, mperez@rwth-aachen.de (Marta Pérez) writes:
> Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom.

Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window.

-- 
Heather Martínez -- Pacific Bell Internet Services
"Do not worship the copy."

From lramirez@cam.ac.uk Thu Jan 12 02:00:45 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!cam!lramirez
From: lramirez@cam.ac.uk (Lisa Ramírez)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jan12.020045.9433@cam.ac.uk>
Date: Thu, 12 Jan 1995 02:00:45 GMT
References: <1995Jan09.224145.3800@inria.fr> <1995Jan10.014945.4730@rwth-aachen.de> <1995Jan11.001745.7408@pacbell.net>
Organization: University of Cambridge Computer Laboratory
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In article <1995Jan11.001745.7408@pacbell.net>, hmartinez@pacbell.net (Heather Martínez) writes:
> Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window.

Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image?

-- 
Lisa Ramírez
Opinions expressed are solely my own and not those of University of Cambridge Computer Laboratory.
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