From nsuzuki@delphi.com Mon Oct 02 07:19:46 1995 Path: ashpoly!cascade!mxgate!coyoacan!delphi!nsuzuki From: nsuzuki@delphi.com (Nadia Suzuki) Newsgroups: comp.sys.m68k Subject: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct02.071946.9693@delphi.com> Date: Mon, 02 Oct 1995 07:19:46 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: WinVN 0.99.5 Lines: 10 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Nadia Suzuki -- Delphi Internet Services "Marcus is not one man." From npopov@kiae.su Tue Oct 03 22:02:46 1995 Path: ashpoly!cascade!bigsur!kiae!npopov From: npopov@kiae.su (Nadine Popov) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct03.220246.7406@kiae.su> Date: Tue, 03 Oct 1995 22:02:46 GMT References: <1995Oct02.071946.9693@delphi.com> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Oct02.071946.9693@delphi.com>, nsuzuki@delphi.com (Nadia Suzuki) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Nadine Popov US Robotics Courier V.34 @ 14,400 bps "When every node is whole, the channel opens." From kpopov@earthlink.net Wed Oct 04 10:20:46 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!earthlink!kpopov From: kpopov@earthlink.net (Kirsty Popov) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct04.102046.6650@earthlink.net> Date: Wed, 04 Oct 1995 10:20:46 GMT References: <1995Oct02.071946.9693@delphi.com> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Oct02.071946.9693@delphi.com>, nsuzuki@delphi.com (Nadia Suzuki) 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. -- Kirsty Popov *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0 From mkuznetsov@cam.ac.uk Fri Oct 06 11:05:46 1995 Path: ashpoly!cascade!bigsur!cam!mkuznetsov From: mkuznetsov@cam.ac.uk (Mathieu Kuznetsov) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct06.110546.2449@cam.ac.uk> Date: Fri, 06 Oct 1995 11:05:46 GMT References: <1995Oct02.071946.9693@delphi.com> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Oct02.071946.9693@delphi.com>, nsuzuki@delphi.com (Nadia Suzuki) 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. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Mathieu Kuznetsov "Extraordinary claims require extraordinary spectra." Mac IIci / 68882 FPU / SunOS 4.1.4