From bito@uni-hamburg.de Fri Jan 21 07:02:58 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!uni-hamburg!bito From: bito@uni-hamburg.de (Bruno Ito) Newsgroups: comp.sys.m68k Subject: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jan21.070258.2426@uni-hamburg.de> Date: Fri, 21 Jan 1994 07:02:58 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de 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. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Bruno Ito "5 sigma is a discovery. 7 is a question." Pentium 90 (OS/2 Warp) / System 7.5.1 From lchoi@illinois.edu Sun Jan 23 02:09:58 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!illinois!lchoi From: lchoi@illinois.edu (Lisa Choi) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jan23.020958.1752@illinois.edu> Date: Sun, 23 Jan 1994 02:09:58 GMT References: <1994Jan21.070258.2426@uni-hamburg.de> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1994Jan21.070258.2426@uni-hamburg.de>, bito@uni-hamburg.de (Bruno Ito) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Top-posters will be placed in my ~/.killfile without notice. -- Lisa Choi SupraFAXModem 28.8 @ 28,800 bps "We don't sign stars. We build them." From noliveira@cern.ch Tue Jan 25 02:16:58 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!cern!noliveira From: noliveira@cern.ch (Nadia Oliveira) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jan25.021658.3112@cern.ch> Date: Tue, 25 Jan 1994 02:16:58 GMT References: <1994Jan21.070258.2426@uni-hamburg.de> <1994Jan23.020958.1752@illinois.edu> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Jan23.020958.1752@illinois.edu>, lchoi@illinois.edu (Lisa Choi) 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. > Top-posters will be placed in my ~/.killfile without notice. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- === Nadia Oliveira === Dept of Electrical Engineering, European Laboratory for Particle Physics, Geneva "We don't sign stars. We build them." From jnilsson@demon.co.uk Tue Jan 25 05:14:58 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!demon!jnilsson From: jnilsson@demon.co.uk (Joachim Nilsson) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jan25.051458.7868@demon.co.uk> Date: Tue, 25 Jan 1994 05:14:58 GMT References: <1994Jan21.070258.2426@uni-hamburg.de> <1994Jan23.020958.1752@illinois.edu> <1994Jan25.021658.3112@cern.ch> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Jan25.021658.3112@cern.ch>, noliveira@cern.ch (Nadia Oliveira) 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. -- Joachim Nilsson Tape trading list upon request. SASE required for international mail. From dkarlsson@delphi.com Thu Jan 27 02:11:58 1994 Path: ashpoly!cascade!mxgate!coyoacan!delphi!dkarlsson From: dkarlsson@delphi.com (Dong-hyun Karlsson) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jan27.021158.1858@delphi.com> Date: Thu, 27 Jan 1994 02:11:58 GMT References: <1994Jan21.070258.2426@uni-hamburg.de> <1994Jan23.020958.1752@illinois.edu> <1994Jan25.021658.3112@cern.ch> <1994Jan25.051458.7868@demon.co.uk> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Jan25.051458.7868@demon.co.uk>, jnilsson@demon.co.uk (Joachim Nilsson) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! If you are posting from AOL, please read RFC 1036 before posting again. -- Dong-hyun Karlsson Tape trading list upon request. SASE required for international mail.