From vkowalski@berkeley.edu Wed Feb 15 03:47:46 1995 Path: ashpoly!cascade!transat!ukc!fennimore!berkeley!vkowalski From: vkowalski@berkeley.edu (Valeria Kowalski) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb15.034746.3066@berkeley.edu> Date: Wed, 15 Feb 1995 03:47:46 GMT Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: WinVN 0.99.5 Lines: 11 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! 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! -- Valeria Kowalski "Do not worship the copy." Commodore Amiga 500 (1MB OCS) / Linux 1.2.13 From moliveira@inria.fr Wed Feb 15 15:16:46 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!inria!moliveira From: moliveira@inria.fr (Morag Oliveira) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb15.151646.6317@inria.fr> Date: Wed, 15 Feb 1995 15:16:46 GMT References: <1995Feb15.034746.3066@berkeley.edu> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Feb15.034746.3066@berkeley.edu>, vkowalski@berkeley.edu (Valeria Kowalski) writes: > 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! Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Morag Oliveira | moliveira@inria.fr PGP Key fingerprint: 67B7 14CB 9226 3462 "Keep the channels open." From bhughes@rwth-aachen.de Thu Feb 16 03:45:46 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!rwth-aachen!bhughes From: bhughes@rwth-aachen.de (Bruno Hughes) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb16.034546.2552@rwth-aachen.de> Date: Thu, 16 Feb 1995 03:45:46 GMT References: <1995Feb15.034746.3066@berkeley.edu> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Feb15.034746.3066@berkeley.edu>, vkowalski@berkeley.edu (Valeria Kowalski) 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. -- Bruno Hughes US Robotics Courier V.34 @ 28,800 bps "The hatch is open. Is anyone listening?" From krobertson@mindspring.com Thu Feb 16 22:35:46 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!mindspring!krobertson From: krobertson@mindspring.com (Karen Robertson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb16.223546.8027@mindspring.com> Date: Thu, 16 Feb 1995 22:35:46 GMT References: <1995Feb15.034746.3066@berkeley.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Feb15.034746.3066@berkeley.edu>, vkowalski@berkeley.edu (Valeria Kowalski) writes: > 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! Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Karen Robertson Opinions expressed are solely my own and not those of MindSpring Enterprises. ------------------------------------------------------------ From areyes@hanse.de Sat Feb 18 20:59:46 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!hanse!areyes From: areyes@hanse.de (Anja Reyes) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb18.205946.1111@hanse.de> Date: Sat, 18 Feb 1995 20:59:46 GMT References: <1995Feb15.034746.3066@berkeley.edu> <1995Feb15.151646.6317@inria.fr> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Feb15.151646.6317@inria.fr>, moliveira@inria.fr (Morag Oliveira) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Anja Reyes Opinions expressed are solely my own and not those of Hanse-Netzwerk Hamburg. ------------------------------------------------------------