From moliveira@mindspring.com Mon Jun 26 06:03:35 1995
Path: ashpoly!cascade!brgate!saturno!mindspring!moliveira
From: moliveira@mindspring.com (Min-jun Oliveira)
Newsgroups: comp.sys.m68k
Subject: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jun26.060335.7224@mindspring.com>
Date: Mon, 26 Jun 1995 06:03:35 GMT
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Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.

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.
When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization!

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

-- 
Min-jun Oliveira | moliveira@mindspring.com
PGP Key fingerprint: 4CFB 76DA 5E4A 099C
"Keep the channels open."

From jgonzalez@clari.net Tue Jun 27 08:40:35 1995
Path: ashpoly!cascade!transat!ukc!fennimore!clari!jgonzalez
From: jgonzalez@clari.net (Julien González)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jun27.084035.1296@clari.net>
Date: Tue, 27 Jun 1995 08:40:35 GMT
References: <1995Jun26.060335.7224@mindspring.com>
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In article <1995Jun26.060335.7224@mindspring.com>, moliveira@mindspring.com (Min-jun Oliveira) writes:
> Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.

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

-- 
Julien González
Tape trading list upon request. SASE required for international mail.