From mandersson@mit.edu Sat Sep 23 15:51:19 1995
Path: ashpoly!cascade!transat!ukc!fennimore!mit!mandersson
From: mandersson@mit.edu (Marisol Andersson)
Newsgroups: comp.sys.m68k
Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Sep23.155119.4683@mit.edu>
Date: Sat, 23 Sep 1995 15:51:19 GMT
Organization: Massachusetts Institute of Technology
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Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.

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

Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week.

-- 
Marisol Andersson | mandersson@mit.edu
PGP Key fingerprint: D682 D19F 54DB AC31
"Keep the channels open."

From etakahashi@ox.ac.uk Sun Sep 24 06:12:19 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!ox!etakahashi
From: etakahashi@ox.ac.uk (Emi Takahashi)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Sep24.061219.6395@ox.ac.uk>
Date: Sun, 24 Sep 1995 06:12:19 GMT
References: <1995Sep23.155119.4683@mit.edu>
Organization: Oxford University Computing Laboratory
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In article <1995Sep23.155119.4683@mit.edu>, mandersson@mit.edu (Marisol Andersson) 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.

-- 
Emi Takahashi -- Oxford University Computing Laboratory
"5 sigma is a discovery. 7 is a question."

From dschneider@panix.com Sun Sep 24 22:30:19 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!panix!dschneider
From: dschneider@panix.com (Dmitri Schneider)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Sep24.223019.8348@panix.com>
Date: Sun, 24 Sep 1995 22:30:19 GMT
References: <1995Sep23.155119.4683@mit.edu> <1995Sep24.061219.6395@ox.ac.uk>
Organization: Public Access Unix of New York
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In article <1995Sep24.061219.6395@ox.ac.uk>, etakahashi@ox.ac.uk (Emi Takahashi) 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.

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

-- 
=== Dmitri Schneider ===
Dept of Electrical Engineering, Public Access Unix of New York
"They will send a copy in my place."