From tperez@mit.edu Mon May 22 10:43:25 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!mit!tperez From: tperez@mit.edu (Thiago Pérez) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May22.104325.7407@mit.edu> Date: Mon, 22 May 1995 10:43:25 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. 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. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Thiago Pérez Opinions expressed are solely my own and not those of Massachusetts Institute of Technology. ------------------------------------------------------------ From dsmirnov@kth.se Tue May 23 17:05:25 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kth!dsmirnov From: dsmirnov@kth.se (Dave Smirnov) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May23.170525.8953@kth.se> Date: Tue, 23 May 1995 17:05:25 GMT References: <1995May22.104325.7407@mit.edu> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995May22.104325.7407@mit.edu>, tperez@mit.edu (Thiago Pérez) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Dave Smirnov -- Royal Institute of Technology, Stockholm "In theory there is no difference between theory and practice." From mpetrov@cmu.edu Thu May 25 14:59:25 1995 Path: ashpoly!cascade!brgate!saturno!cmu!mpetrov From: mpetrov@cmu.edu (Mikhail Petrov) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May25.145925.4015@cmu.edu> Date: Thu, 25 May 1995 14:59:25 GMT References: <1995May22.104325.7407@mit.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995May22.104325.7407@mit.edu>, tperez@mit.edu (Thiago Pérez) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Mikhail Petrov US Robotics Courier V.34 @ 19,200 bps "Do not worship the copy." From fwatanabe@unam.mx Thu May 25 20:41:25 1995 Path: ashpoly!cascade!mxgate!coyoacan!unam!fwatanabe From: fwatanabe@unam.mx (Freya Watanabe) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May25.204125.9761@unam.mx> Date: Thu, 25 May 1995 20:41:25 GMT References: <1995May22.104325.7407@mit.edu> <1995May25.145925.4015@cmu.edu> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995May25.145925.4015@cmu.edu>, mpetrov@cmu.edu (Mikhail Petrov) 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. -- Freya Watanabe Tape trading list upon request. SASE required for international mail. From dpopov@tum.de Sat May 27 00:29:25 1995 Path: ashpoly!cascade!mxgate!coyoacan!tum!dpopov From: dpopov@tum.de (Diego Popov) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May27.002925.4443@tum.de> Date: Sat, 27 May 1995 00:29:25 GMT References: <1995May22.104325.7407@mit.edu> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N Lines: 10 In article <1995May22.104325.7407@mit.edu>, tperez@mit.edu (Thiago Pérez) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Diego Popov Opinions expressed are solely my own and not those of Technische Universität München. ------------------------------------------------------------