From lwatanabe@illinois.edu Wed Sep 25 10:57:11 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!illinois!lwatanabe From: lwatanabe@illinois.edu (Liam Watanabe) Newsgroups: comp.sys.m68k Subject: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep25.105711.4166@illinois.edu> Date: Wed, 25 Sep 1996 10:57:11 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu 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? -- Liam Watanabe "Measuring a record you own is listening, not piracy." NeXTstation Turbo Color / FreeBSD 2.1 From hmuller@ox.ac.uk Thu Sep 26 14:59:11 1996 Path: ashpoly!cascade!bigsur!ox!hmuller From: hmuller@ox.ac.uk (Heather Müller) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep26.145911.2503@ox.ac.uk> Date: Thu, 26 Sep 1996 14:59:11 GMT References: <1996Sep25.105711.4166@illinois.edu> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1996Sep25.105711.4166@illinois.edu>, lwatanabe@illinois.edu (Liam Watanabe) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Heather Müller -- Oxford University Computing Laboratory "Measuring a record you own is listening, not piracy." From tkowalski@cmu.edu Fri Sep 27 18:58:11 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cmu!tkowalski From: tkowalski@cmu.edu (Takeshi Kowalski) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep27.185811.8656@cmu.edu> Date: Fri, 27 Sep 1996 18:58:11 GMT References: <1996Sep25.105711.4166@illinois.edu> <1996Sep26.145911.2503@ox.ac.uk> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1996Sep26.145911.2503@ox.ac.uk>, hmuller@ox.ac.uk (Heather Müller) writes: > Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Takeshi Kowalski -- Carnegie Mellon University School of CS "They will send a copy in my place." From nfournier@mit.edu Sat Sep 28 00:34:11 1996 Path: ashpoly!cascade!brgate!saturno!mit!nfournier From: nfournier@mit.edu (Natalia Fournier) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep28.003411.9356@mit.edu> Date: Sat, 28 Sep 1996 00:34:11 GMT References: <1996Sep25.105711.4166@illinois.edu> <1996Sep26.145911.2503@ox.ac.uk> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Sep26.145911.2503@ox.ac.uk>, hmuller@ox.ac.uk (Heather Müller) writes: > Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Natalia Fournier SupraFAXModem 28.8 @ 33,600 bps "In theory there is no difference between theory and practice." From jsuzuki@uni-hamburg.de Sun Sep 29 12:34:11 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uni-hamburg!jsuzuki From: jsuzuki@uni-hamburg.de (Jens Suzuki) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep29.123411.2683@uni-hamburg.de> Date: Sun, 29 Sep 1996 12:34:11 GMT References: <1996Sep25.105711.4166@illinois.edu> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Sep25.105711.4166@illinois.edu>, lwatanabe@illinois.edu (Liam Watanabe) 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. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Jens Suzuki Tape trading list upon request. SASE required for international mail.