From mkim@rwth-aachen.de Sun Aug 28 17:50:05 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!rwth-aachen!mkim From: mkim@rwth-aachen.de (Mathieu Kim) Newsgroups: comp.sys.m68k Subject: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Aug28.175005.6092@rwth-aachen.de> Date: Sun, 28 Aug 1994 17:50:05 GMT Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: WinVN 0.99.5 Lines: 10 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. 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! Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Mathieu Kim Tape trading list upon request. SASE required for international mail. From achoi@cmu.edu Tue Aug 30 17:27:05 1994 Path: ashpoly!cascade!brgate!saturno!cmu!achoi From: achoi@cmu.edu (Amy Choi) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Aug30.172705.2916@cmu.edu> Date: Tue, 30 Aug 1994 17:27:05 GMT References: <1994Aug28.175005.6092@rwth-aachen.de> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Aug28.175005.6092@rwth-aachen.de>, mkim@rwth-aachen.de (Mathieu Kim) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- === Amy Choi === Dept of Electrical Engineering, Carnegie Mellon University School of CS "They will send a copy in my place." From tgirard@stanford.edu Thu Sep 01 08:09:05 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!stanford!tgirard From: tgirard@stanford.edu (Takeshi Girard) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Sep01.080905.1831@stanford.edu> Date: Thu, 01 Sep 1994 08:09:05 GMT References: <1994Aug28.175005.6092@rwth-aachen.de> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1994Aug28.175005.6092@rwth-aachen.de>, mkim@rwth-aachen.de (Mathieu Kim) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Takeshi Girard Opinions expressed are solely my own and not those of Stanford University Computer Systems Lab. ------------------------------------------------------------ From nnakamura@earthlink.net Thu Sep 01 21:35:05 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!earthlink!nnakamura From: nnakamura@earthlink.net (Nadia Nakamura) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Sep01.213505.2366@earthlink.net> Date: Thu, 01 Sep 1994 21:35:05 GMT References: <1994Aug28.175005.6092@rwth-aachen.de> <1994Aug30.172705.2916@cmu.edu> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Aug30.172705.2916@cmu.edu>, achoi@cmu.edu (Amy Choi) 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. -- Nadia Nakamura *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0