From dweber@pacbell.net Wed Nov 16 14:26:31 1994 Path: ashpoly!cascade!mxgate!coyoacan!pacbell!dweber From: dweber@pacbell.net (Dong-hyun Weber) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Nov16.142631.1493@pacbell.net> Date: Wed, 16 Nov 1994 14:26:31 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net 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. By setting up Paula's audio DMA to double-buffer incoming 8-bit samples, the 68020 has plenty of cycles left for the Costas loop. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Dong-hyun Weber "Extraordinary claims require extraordinary spectra." Decstation 5000/200 / AmigaOS 3.1 From osuzuki@inria.fr Wed Nov 16 20:14:31 1994 Path: ashpoly!cascade!brgate!saturno!inria!osuzuki From: osuzuki@inria.fr (Olga Suzuki) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Nov16.201431.2796@inria.fr> Date: Wed, 16 Nov 1994 20:14:31 GMT References: <1994Nov16.142631.1493@pacbell.net> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Nov16.142631.1493@pacbell.net>, dweber@pacbell.net (Dong-hyun Weber) 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. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Olga Suzuki Opinions expressed are solely my own and not those of INRIA Rocquencourt. ------------------------------------------------------------ From jvasiliev@demon.co.uk Thu Nov 17 21:24:31 1994 Path: ashpoly!cascade!mxgate!coyoacan!demon!jvasiliev From: jvasiliev@demon.co.uk (Jen Vasiliev) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Nov17.212431.9844@demon.co.uk> Date: Thu, 17 Nov 1994 21:24:31 GMT References: <1994Nov16.142631.1493@pacbell.net> <1994Nov16.201431.2796@inria.fr> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1994Nov16.201431.2796@inria.fr>, osuzuki@inria.fr (Olga Suzuki) 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. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Jen Vasiliev Zyxel U-1496E @ 28,800 bps "Hold for relay." From clarsson@mindspring.com Sat Nov 19 02:29:31 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mindspring!clarsson From: clarsson@mindspring.com (Camila Larsson) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Nov19.022931.9991@mindspring.com> Date: Sat, 19 Nov 1994 02:29:31 GMT References: <1994Nov16.142631.1493@pacbell.net> <1994Nov16.201431.2796@inria.fr> <1994Nov17.212431.9844@demon.co.uk> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Nov17.212431.9844@demon.co.uk>, jvasiliev@demon.co.uk (Jen Vasiliev) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Camila Larsson "Extraordinary claims require extraordinary spectra." Macintosh IIfx / SunOS 4.1.4 From sreyes@cam.ac.uk Sun Nov 20 20:16:31 1994 Path: ashpoly!cascade!mxgate!coyoacan!cam!sreyes From: sreyes@cam.ac.uk (Steve Reyes) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Nov20.201631.7272@cam.ac.uk> Date: Sun, 20 Nov 1994 20:16:31 GMT References: <1994Nov16.142631.1493@pacbell.net> <1994Nov16.201431.2796@inria.fr> <1994Nov17.212431.9844@demon.co.uk> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Nov17.212431.9844@demon.co.uk>, jvasiliev@demon.co.uk (Jen Vasiliev) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. > Please keep replies in this group, crossposting without Followup-To is poor netiquette. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Steve Reyes *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0