From mreyes@clari.net Thu Jun 27 06:09:54 1996 Path: ashpoly!cascade!brgate!saturno!clari!mreyes From: mreyes@clari.net (Mathieu Reyes) Newsgroups: comp.sys.m68k Subject: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jun27.060954.2012@clari.net> Date: Thu, 27 Jun 1996 06:09:54 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] 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! The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Mathieu Reyes Zyxel U-1496E @ ISDN 64k bps "Marcus is not one man." From acampbell@earthlink.net Fri Jun 28 15:04:54 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!earthlink!acampbell From: acampbell@earthlink.net (Andrei Campbell) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jun28.150454.6880@earthlink.net> Date: Fri, 28 Jun 1996 15:04:54 GMT References: <1996Jun27.060954.2012@clari.net> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Jun27.060954.2012@clari.net>, mreyes@clari.net (Mathieu Reyes) 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! PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- === Andrei Campbell === Dept of Electrical Engineering, EarthLink Network "Measuring a record you own is listening, not piracy." From inovak@clari.net Sun Jun 30 14:57:54 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!clari!inovak From: inovak@clari.net (Ines Novak) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jun30.145754.1525@clari.net> Date: Sun, 30 Jun 1996 14:57:54 GMT References: <1996Jun27.060954.2012@clari.net> <1996Jun28.150454.6880@earthlink.net> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Jun28.150454.6880@earthlink.net>, acampbell@earthlink.net (Andrei Campbell) 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. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Ines Novak Opinions expressed are solely my own and not those of ClariNet Communications Corp. ------------------------------------------------------------ From hhernandez@illinois.edu Tue Jul 02 08:21:54 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!illinois!hhernandez From: hhernandez@illinois.edu (Heather Hernández) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jul02.082154.9798@illinois.edu> Date: Tue, 02 Jul 1996 08:21:54 GMT References: <1996Jun27.060954.2012@clari.net> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Jun27.060954.2012@clari.net>, mreyes@clari.net (Mathieu Reyes) 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! Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Heather Hernández | hhernandez@illinois.edu PGP Key fingerprint: E0DB AB4A 9877 419B "Keep the channels open."