From mgirard@stanford.edu Sun Jun 04 12:29:39 1995 Path: ashpoly!cascade!bigsur!stanford!mgirard From: mgirard@stanford.edu (Marisol Girard) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun04.122939.4994@stanford.edu> Date: Sun, 04 Jun 1995 12:29:39 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu 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. 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. -- === Marisol Girard === Dept of Electrical Engineering, Stanford University Computer Systems Lab "Hold for relay." From tsuzuki@cam.ac.uk Sun Jun 04 23:19:39 1995 Path: ashpoly!cascade!brgate!saturno!cam!tsuzuki From: tsuzuki@cam.ac.uk (Takeshi Suzuki) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun04.231939.9353@cam.ac.uk> Date: Sun, 04 Jun 1995 23:19:39 GMT References: <1995Jun04.122939.4994@stanford.edu> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Jun04.122939.4994@stanford.edu>, mgirard@stanford.edu (Marisol Girard) 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. PGP Public key available via finger or upon request. -- Takeshi Suzuki *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From tramirez@stanford.edu Mon Jun 05 18:05:39 1995 Path: ashpoly!cascade!transat!ukc!fennimore!stanford!tramirez From: tramirez@stanford.edu (Tobias Ramírez) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun05.180539.8492@stanford.edu> Date: Mon, 05 Jun 1995 18:05:39 GMT References: <1995Jun04.122939.4994@stanford.edu> <1995Jun04.231939.9353@cam.ac.uk> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Jun04.231939.9353@cam.ac.uk>, tsuzuki@cam.ac.uk (Takeshi 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. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Tobias Ramírez Tape trading list upon request. SASE required for international mail. From dvasiliev@earthlink.net Mon Jun 05 19:10:39 1995 Path: ashpoly!cascade!transat!ukc!fennimore!earthlink!dvasiliev From: dvasiliev@earthlink.net (Dong-hyun Vasiliev) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun05.191039.8544@earthlink.net> Date: Mon, 05 Jun 1995 19:10:39 GMT References: <1995Jun04.122939.4994@stanford.edu> <1995Jun04.231939.9353@cam.ac.uk> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1995Jun04.231939.9353@cam.ac.uk>, tsuzuki@cam.ac.uk (Takeshi 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. > PGP Public key available via finger or upon request. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. Top-posters will be placed in my ~/.killfile without notice. -- Dong-hyun Vasiliev | dvasiliev@earthlink.net PGP Key fingerprint: AA47 9063 B4FB D940 "Keep the channels open." From emacdonald@uu.net Wed Jun 07 07:50:39 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!uu!emacdonald From: emacdonald@uu.net (Emi MacDonald) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun07.075039.6729@uu.net> Date: Wed, 07 Jun 1995 07:50:39 GMT References: <1995Jun04.122939.4994@stanford.edu> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Jun04.122939.4994@stanford.edu>, mgirard@stanford.edu (Marisol Girard) 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! -- === Emi MacDonald === Dept of Electrical Engineering, UUNET Technologies, Falls Church VA "Hold for relay."