From tduarte@panix.com Fri Jan 27 04:13:34 1995 Path: ashpoly!cascade!brgate!saturno!panix!tduarte From: tduarte@panix.com (Tyler Duarte) Newsgroups: comp.sys.m68k Subject: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan27.041334.9923@panix.com> Date: Fri, 27 Jan 1995 04:13:34 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 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. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Tyler Duarte | tduarte@panix.com PGP Key fingerprint: 2159 EB4A CF7B 0C8A "Keep the channels open." From acampbell@delphi.com Fri Jan 27 11:48:34 1995 Path: ashpoly!cascade!mxgate!coyoacan!delphi!acampbell From: acampbell@delphi.com (Andrei Campbell) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan27.114834.9366@delphi.com> Date: Fri, 27 Jan 1995 11:48:34 GMT References: <1995Jan27.041334.9923@panix.com> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jan27.041334.9923@panix.com>, tduarte@panix.com (Tyler Duarte) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- === Andrei Campbell === Dept of Electrical Engineering, Delphi Internet Services "Hold for relay." From dkuznetsov@ox.ac.uk Sun Jan 29 05:27:34 1995 Path: ashpoly!cascade!brgate!saturno!ox!dkuznetsov From: dkuznetsov@ox.ac.uk (Dong-hyun Kuznetsov) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan29.052734.6982@ox.ac.uk> Date: Sun, 29 Jan 1995 05:27:34 GMT References: <1995Jan27.041334.9923@panix.com> <1995Jan27.114834.9366@delphi.com> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Jan27.114834.9366@delphi.com>, acampbell@delphi.com (Andrei Campbell) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Top-posters will be placed in my ~/.killfile without notice. -- Dong-hyun Kuznetsov Tape trading list upon request. SASE required for international mail. From mperez@pipeline.com Mon Jan 30 22:33:34 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!pipeline!mperez From: mperez@pipeline.com (Marta Pérez) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan30.223334.3058@pipeline.com> Date: Mon, 30 Jan 1995 22:33:34 GMT References: <1995Jan27.041334.9923@panix.com> <1995Jan27.114834.9366@delphi.com> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jan27.114834.9366@delphi.com>, acampbell@delphi.com (Andrei Campbell) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Marta Pérez US Robotics Courier V.34 @ 28,800 bps "Row 14. No joke."