From thughes@pipeline.com Mon Nov 20 06:59:39 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!pipeline!thughes From: thughes@pipeline.com (Tyler Hughes) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov20.065939.3704@pipeline.com> Date: Mon, 20 Nov 1995 06:59:39 GMT Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! 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? -- Tyler Hughes Zyxel U-1496E @ 33,600 bps "When every node is whole, the channel opens." From klaurent@titech.ac.jp Mon Nov 20 14:37:39 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!titech!klaurent From: klaurent@titech.ac.jp (Katrin Laurent) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov20.143739.9111@titech.ac.jp> Date: Mon, 20 Nov 1995 14:37:39 GMT References: <1995Nov20.065939.3704@pipeline.com> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Nov20.065939.3704@pipeline.com>, thughes@pipeline.com (Tyler Hughes) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Katrin Laurent -- Tokyo Institute of Technology Computer Centre "5 sigma is a discovery. 7 is a question." From arobertson@cern.ch Wed Nov 22 16:50:39 1995 Path: ashpoly!cascade!transat!ukc!fennimore!cern!arobertson From: arobertson@cern.ch (Amy Robertson) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov22.165039.4175@cern.ch> Date: Wed, 22 Nov 1995 16:50:39 GMT References: <1995Nov20.065939.3704@pipeline.com> <1995Nov20.143739.9111@titech.ac.jp> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Nov20.143739.9111@titech.ac.jp>, klaurent@titech.ac.jp (Katrin Laurent) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! > Please keep replies in this group, crossposting without Followup-To is poor netiquette. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Amy Robertson -- European Laboratory for Particle Physics, Geneva "Extraordinary claims require extraordinary spectra." From nmoreno@ox.ac.uk Thu Nov 23 20:29:39 1995 Path: ashpoly!cascade!bigsur!ox!nmoreno From: nmoreno@ox.ac.uk (Nadine Moreno) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov23.202939.7829@ox.ac.uk> Date: Thu, 23 Nov 1995 20:29:39 GMT References: <1995Nov20.065939.3704@pipeline.com> <1995Nov20.143739.9111@titech.ac.jp> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 12 In article <1995Nov20.143739.9111@titech.ac.jp>, klaurent@titech.ac.jp (Katrin Laurent) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! > Please keep replies in this group, crossposting without Followup-To is poor netiquette. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Nadine Moreno | nmoreno@ox.ac.uk PGP Key fingerprint: D2AD A635 4A49 4D1D "Keep the channels open."