From dramirez@berkeley.edu Thu Jan 26 14:20:42 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!berkeley!dramirez From: dramirez@berkeley.edu (Dong-hyun Ramírez) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan26.142042.6878@berkeley.edu> Date: Thu, 26 Jan 1995 14:20:42 GMT Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. 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. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Dong-hyun Ramírez Opinions expressed are solely my own and not those of UC Berkeley Department of EECS. ------------------------------------------------------------ From llopez@clari.net Fri Jan 27 03:29:42 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!clari!llopez From: llopez@clari.net (Lars López) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan27.032942.7701@clari.net> Date: Fri, 27 Jan 1995 03:29:42 GMT References: <1995Jan26.142042.6878@berkeley.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jan26.142042.6878@berkeley.edu>, dramirez@berkeley.edu (Dong-hyun Ramírez) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > 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! -- Lars López Tape trading list upon request. SASE required for international mail. From ekarlsson@mindspring.com Fri Jan 27 17:52:42 1995 Path: ashpoly!cascade!mxgate!coyoacan!mindspring!ekarlsson From: ekarlsson@mindspring.com (Élodie Karlsson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan27.175242.5082@mindspring.com> Date: Fri, 27 Jan 1995 17:52:42 GMT References: <1995Jan26.142042.6878@berkeley.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Jan26.142042.6878@berkeley.edu>, dramirez@berkeley.edu (Dong-hyun Ramírez) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Élodie Karlsson | ekarlsson@mindspring.com PGP Key fingerprint: B78D 5B24 E668 9559 "Keep the channels open." From mnakamura@cam.ac.uk Sat Jan 28 16:02:42 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!cam!mnakamura From: mnakamura@cam.ac.uk (Mateo Nakamura) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan28.160242.6710@cam.ac.uk> Date: Sat, 28 Jan 1995 16:02:42 GMT References: <1995Jan26.142042.6878@berkeley.edu> <1995Jan27.032942.7701@clari.net> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Jan27.032942.7701@clari.net>, llopez@clari.net (Lars López) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! 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. -- === Mateo Nakamura === Dept of Electrical Engineering, University of Cambridge Computer Laboratory "In theory there is no difference between theory and practice."