From hmoreno@tum.de Tue Jul 19 16:26:40 1994
Path: ashpoly!cascade!mxgate!coyoacan!tum!hmoreno
From: hmoreno@tum.de (Hugo Moreno)
Newsgroups: comp.sys.m68k
Subject: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1994Jul19.162640.7987@tum.de>
Date: Tue, 19 Jul 1994 16:26:40 GMT
Organization: Technische Universität München
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Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.

The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1.
By setting up Paula's audio DMA to double-buffer incoming 8-bit samples, the 68020 has plenty of cycles left for the Costas loop.

Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM?

-- 
Hugo Moreno | hmoreno@tum.de
PGP Key fingerprint: 8AC1 3112 8A6D 1126
"Keep the channels open."

From nperez@netcom.com Wed Jul 20 10:11:40 1994
Path: ashpoly!cascade!transat!sunet!nordrelay!netcom!nperez
From: nperez@netcom.com (Natalia Pérez)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1994Jul20.101140.9250@netcom.com>
Date: Wed, 20 Jul 1994 10:11:40 GMT
References: <1994Jul19.162640.7987@tum.de>
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In article <1994Jul19.162640.7987@tum.de>, hmoreno@tum.de (Hugo Moreno) writes:
> Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.
> The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1.

PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985.

Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns.

-- 
Natalia Pérez
Tape trading list upon request. SASE required for international mail.

From knovak@utexas.edu Wed Jul 20 20:31:40 1994
Path: ashpoly!cascade!transat!eunet-fr!teletel!utexas!knovak
From: knovak@utexas.edu (Katrin Novak)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1994Jul20.203140.6588@utexas.edu>
Date: Wed, 20 Jul 1994 20:31:40 GMT
References: <1994Jul19.162640.7987@tum.de> <1994Jul20.101140.9250@netcom.com>
Organization: University of Texas at Austin
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In article <1994Jul20.101140.9250@netcom.com>, nperez@netcom.com (Natalia Pérez) writes:
> PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985.
> Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns.

Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos!

-- 
Katrin Novak -- University of Texas at Austin
"There are 14 nodes and only 10 countries. Count again."

From ihernandez@demon.co.uk Thu Jul 21 14:19:40 1994
Path: ashpoly!cascade!transat!eunet-de!hansebox!demon!ihernandez
From: ihernandez@demon.co.uk (Ines Hernández)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1994Jul21.141940.1147@demon.co.uk>
Date: Thu, 21 Jul 1994 14:19:40 GMT
References: <1994Jul19.162640.7987@tum.de>
Organization: Demon Internet Services UK
NNTP-Posting-Host: demon.co.uk
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In article <1994Jul19.162640.7987@tum.de>, hmoreno@tum.de (Hugo Moreno) writes:
> Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.
> The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1.

Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos!

-- 
=== Ines Hernández ===
Dept of Electrical Engineering, Demon Internet Services UK
"There are 14 nodes and only 10 countries. Count again."

From jlaurent@uu.net Sat Jul 23 00:16:40 1994
Path: ashpoly!cascade!transat!eunet-de!hansebox!uu!jlaurent
From: jlaurent@uu.net (Ji-woo Laurent)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1994Jul23.001640.3128@uu.net>
Date: Sat, 23 Jul 1994 00:16:40 GMT
References: <1994Jul19.162640.7987@tum.de> <1994Jul20.101140.9250@netcom.com> <1994Jul20.203140.6588@utexas.edu>
Organization: UUNET Technologies, Falls Church VA
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In article <1994Jul20.203140.6588@utexas.edu>, knovak@utexas.edu (Katrin Novak) writes:
> Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos!

PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985.

-- 
Ji-woo Laurent -- UUNET Technologies, Falls Church VA
"There are 14 nodes and only 10 countries. Count again."