From tnilsson@stanford.edu Mon Apr 01 19:40:53 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!stanford!tnilsson From: tnilsson@stanford.edu (Tobias Nilsson) Newsgroups: comp.sys.m68k Subject: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr01.194053.4622@stanford.edu> Date: Mon, 01 Apr 1996 19:40:53 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. 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. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Tobias Nilsson Practical Peripherals 14.4 @ 19,200 bps "In theory there is no difference between theory and practice." From mweber@uni-hamburg.de Tue Apr 02 03:18:53 1996 Path: ashpoly!cascade!brgate!saturno!uni-hamburg!mweber From: mweber@uni-hamburg.de (Mathieu Weber) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr02.031853.2493@uni-hamburg.de> Date: Tue, 02 Apr 1996 03:18:53 GMT References: <1996Apr01.194053.4622@stanford.edu> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Apr01.194053.4622@stanford.edu>, tnilsson@stanford.edu (Tobias Nilsson) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Mathieu Weber *PLONK* filter active for trolls. 486DX2/66 (Linux 1.2.13) - NetBSD 1.0 From dchoi@inria.fr Wed Apr 03 17:59:53 1996 Path: ashpoly!cascade!brgate!saturno!inria!dchoi From: dchoi@inria.fr (Dong-hyun Choi) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr03.175953.3447@inria.fr> Date: Wed, 03 Apr 1996 17:59:53 GMT References: <1996Apr01.194053.4622@stanford.edu> <1996Apr02.031853.2493@uni-hamburg.de> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1996Apr02.031853.2493@uni-hamburg.de>, mweber@uni-hamburg.de (Mathieu Weber) 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 Choi "Hold for relay." Commodore Amiga 500 (1MB OCS) / AmigaOS 3.1 From blarsson@kiae.su Fri Apr 05 15:09:53 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!kiae!blarsson From: blarsson@kiae.su (Bruno Larsson) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr05.150953.6970@kiae.su> Date: Fri, 05 Apr 1996 15:09:53 GMT References: <1996Apr01.194053.4622@stanford.edu> <1996Apr02.031853.2493@uni-hamburg.de> <1996Apr03.175953.3447@inria.fr> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1996Apr03.175953.3447@inria.fr>, dchoi@inria.fr (Dong-hyun Choi) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Bruno Larsson Tape trading list upon request. SASE required for international mail. From tkowalski@delphi.com Sun Apr 07 09:15:53 1996 Path: ashpoly!cascade!transat!ukc!fennimore!delphi!tkowalski From: tkowalski@delphi.com (Tomas Kowalski) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr07.091553.3290@delphi.com> Date: Sun, 07 Apr 1996 09:15:53 GMT References: <1996Apr01.194053.4622@stanford.edu> <1996Apr02.031853.2493@uni-hamburg.de> <1996Apr03.175953.3447@inria.fr> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Apr03.175953.3447@inria.fr>, dchoi@inria.fr (Dong-hyun Choi) writes: > 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. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Tomas Kowalski Opinions expressed are solely my own and not those of Delphi Internet Services. ------------------------------------------------------------