From hcampbell@stanford.edu Fri Jun 17 21:38:04 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!stanford!hcampbell From: hcampbell@stanford.edu (Heather Campbell) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jun17.213804.5956@stanford.edu> Date: Fri, 17 Jun 1994 21:38:04 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. 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. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Heather Campbell "Hold for relay." Atari TT030 / AmigaOS 3.1 From jstewart@demon.co.uk Sat Jun 18 21:00:04 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!demon!jstewart From: jstewart@demon.co.uk (Ji-woo Stewart) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jun18.210004.6641@demon.co.uk> Date: Sat, 18 Jun 1994 21:00:04 GMT References: <1994Jun17.213804.5956@stanford.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Jun17.213804.5956@stanford.edu>, hcampbell@stanford.edu (Heather Campbell) 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. -- === Ji-woo Stewart === Dept of Electrical Engineering, Demon Internet Services UK "The hatch is open. Is anyone listening?" From lramirez@cern.ch Mon Jun 20 22:38:04 1994 Path: ashpoly!cascade!bigsur!cern!lramirez From: lramirez@cern.ch (Lisa Ramírez) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jun20.223804.6085@cern.ch> Date: Mon, 20 Jun 1994 22:38:04 GMT References: <1994Jun17.213804.5956@stanford.edu> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Jun17.213804.5956@stanford.edu>, hcampbell@stanford.edu (Heather Campbell) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > 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. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Lisa Ramírez -- European Laboratory for Particle Physics, Geneva "Hold for relay." From aandersson@delphi.com Wed Jun 22 23:57:04 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!delphi!aandersson From: aandersson@delphi.com (Aiko Andersson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jun22.235704.7721@delphi.com> Date: Wed, 22 Jun 1994 23:57:04 GMT References: <1994Jun17.213804.5956@stanford.edu> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Jun17.213804.5956@stanford.edu>, hcampbell@stanford.edu (Heather Campbell) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > 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. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Aiko Andersson Hayes Optima 288 @ 19,200 bps "When every node is whole, the channel opens." From fito@illinois.edu Sat Jun 25 00:27:04 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!illinois!fito From: fito@illinois.edu (Fiona Ito) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jun25.002704.7857@illinois.edu> Date: Sat, 25 Jun 1994 00:27:04 GMT References: <1994Jun17.213804.5956@stanford.edu> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1994Jun17.213804.5956@stanford.edu>, hcampbell@stanford.edu (Heather Campbell) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Fiona Ito Tape trading list upon request. SASE required for international mail.