From kkim@unam.mx Sat Dec 10 16:34:05 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!unam!kkim From: kkim@unam.mx (Katrin Kim) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Dec10.163405.4176@unam.mx> Date: Sat, 10 Dec 1994 16:34:05 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: Netscape 1.1N Lines: 11 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Katrin Kim | kkim@unam.mx PGP Key fingerprint: 28E6 C218 DE5C 3BCB "Keep the channels open." From eeriksson@mindspring.com Mon Dec 12 03:42:05 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!mindspring!eeriksson From: eeriksson@mindspring.com (Élodie Eriksson) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Dec12.034205.8439@mindspring.com> Date: Mon, 12 Dec 1994 03:42:05 GMT References: <1994Dec10.163405.4176@unam.mx> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Dec10.163405.4176@unam.mx>, kkim@unam.mx (Katrin Kim) 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. -- Élodie Eriksson | eeriksson@mindspring.com PGP Key fingerprint: FC9A 252E F051 C4E2 "Keep the channels open." From ngonzalez@unam.mx Mon Dec 12 19:46:05 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!unam!ngonzalez From: ngonzalez@unam.mx (Natalia González) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Dec12.194605.1517@unam.mx> Date: Mon, 12 Dec 1994 19:46:05 GMT References: <1994Dec10.163405.4176@unam.mx> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Dec10.163405.4176@unam.mx>, kkim@unam.mx (Katrin Kim) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Natalia González | ngonzalez@unam.mx PGP Key fingerprint: D38E 7EF2 9633 AFF2 "Keep the channels open." From rhernandez@cmu.edu Wed Dec 14 06:48:05 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!cmu!rhernandez From: rhernandez@cmu.edu (Rodrigo Hernández) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Dec14.064805.4524@cmu.edu> Date: Wed, 14 Dec 1994 06:48:05 GMT References: <1994Dec10.163405.4176@unam.mx> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Dec10.163405.4176@unam.mx>, kkim@unam.mx (Katrin Kim) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Rodrigo Hernández "Extraordinary claims require extraordinary spectra." Sun 3/60 (SunOS 4.1.1) / Linux 1.2.13 From mkuznetsov@kiae.su Fri Dec 16 06:46:05 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!kiae!mkuznetsov From: mkuznetsov@kiae.su (Morag Kuznetsov) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Dec16.064605.4525@kiae.su> Date: Fri, 16 Dec 1994 06:46:05 GMT References: <1994Dec10.163405.4176@unam.mx> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1994Dec10.163405.4176@unam.mx>, kkim@unam.mx (Katrin Kim) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Top-posters will be placed in my ~/.killfile without notice. -- === Morag Kuznetsov === Dept of Electrical Engineering, Kurchatov Institute of Atomic Energy, Moscow "5 sigma is a discovery. 7 is a question."