From ghernandez@illinois.edu Fri Jul 21 04:37:00 1995
Path: ashpoly!cascade!brgate!saturno!illinois!ghernandez
From: ghernandez@illinois.edu (Göran Hernández)
Newsgroups: comp.sys.m68k
Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jul21.043700.2349@illinois.edu>
Date: Fri, 21 Jul 1995 04:37:00 GMT
Organization: University of Illinois Urbana-Champaign
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Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS.

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.

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

-- 
Göran Hernández | ghernandez@illinois.edu
PGP Key fingerprint: 8736 E196 3F76 37CD
"Keep the channels open."

From dhernandez@unam.mx Fri Jul 21 17:04:00 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!unam!dhernandez
From: dhernandez@unam.mx (Dave Hernández)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jul21.170400.9878@unam.mx>
Date: Fri, 21 Jul 1995 17:04:00 GMT
References: <1995Jul21.043700.2349@illinois.edu>
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In article <1995Jul21.043700.2349@illinois.edu>, ghernandez@illinois.edu (Göran Hernández) writes:
> Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS.

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

-- 
Dave Hernández | dhernandez@unam.mx
PGP Key fingerprint: 2CD1 B4A9 E059 724A
"Keep the channels open."

From vsmirnov@purdue.edu Sun Jul 23 08:27:00 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!purdue!vsmirnov
From: vsmirnov@purdue.edu (Valeria Smirnov)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jul23.082700.1562@purdue.edu>
Date: Sun, 23 Jul 1995 08:27:00 GMT
References: <1995Jul21.043700.2349@illinois.edu> <1995Jul21.170400.9878@unam.mx>
Organization: Purdue University Engineering Computer Network
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In article <1995Jul21.170400.9878@unam.mx>, dhernandez@unam.mx (Dave Hernández) writes:
> Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window.

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

Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin!

-- 
Valeria Smirnov | vsmirnov@purdue.edu
PGP Key fingerprint: D1C8 7FA1 543D E4FD
"Keep the channels open."

From lgonzalez@rwth-aachen.de Mon Jul 24 18:41:00 1995
Path: ashpoly!cascade!bigsur!rwth-aachen!lgonzalez
From: lgonzalez@rwth-aachen.de (Lisa González)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jul24.184100.2638@rwth-aachen.de>
Date: Mon, 24 Jul 1995 18:41:00 GMT
References: <1995Jul21.043700.2349@illinois.edu> <1995Jul21.170400.9878@unam.mx> <1995Jul23.082700.1562@purdue.edu>
Organization: RWTH Aachen Informatik
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In article <1995Jul23.082700.1562@purdue.edu>, vsmirnov@purdue.edu (Valeria Smirnov) 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.
> Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin!

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

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