From emoreno@unam.mx Sat Mar 04 03:31:18 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!unam!emoreno From: emoreno@unam.mx (Élodie Moreno) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar04.033118.3364@unam.mx> Date: Sat, 04 Mar 1995 03:31:18 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 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! The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Élodie Moreno | emoreno@unam.mx PGP Key fingerprint: C944 B5FF 6599 11D1 "Keep the channels open." From skarlsson@u-tokyo.ac.jp Sun Mar 05 17:25:18 1995 Path: ashpoly!cascade!mxgate!coyoacan!u-tokyo!skarlsson From: skarlsson@u-tokyo.ac.jp (Steve Karlsson) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar05.172518.6338@u-tokyo.ac.jp> Date: Sun, 05 Mar 1995 17:25:18 GMT References: <1995Mar04.033118.3364@unam.mx> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Mar04.033118.3364@unam.mx>, emoreno@unam.mx (Élodie Moreno) writes: > 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! Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Steve Karlsson "Measuring a record you own is listening, not piracy." Sun 3/60 (SunOS 4.1.1) / Linux 1.2.13 From dkarlsson@purdue.edu Tue Mar 07 07:19:18 1995 Path: ashpoly!cascade!mxgate!coyoacan!purdue!dkarlsson From: dkarlsson@purdue.edu (Dave Karlsson) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar07.071918.3479@purdue.edu> Date: Tue, 07 Mar 1995 07:19:18 GMT References: <1995Mar04.033118.3364@unam.mx> <1995Mar05.172518.6338@u-tokyo.ac.jp> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Mar05.172518.6338@u-tokyo.ac.jp>, skarlsson@u-tokyo.ac.jp (Steve Karlsson) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. Top-posters will be placed in my ~/.killfile without notice. -- Dave Karlsson Practical Peripherals 14.4 @ 19,200 bps "We don't sign stars. We build them." From tschneider@utexas.edu Tue Mar 07 21:15:18 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!utexas!tschneider From: tschneider@utexas.edu (Tobias Schneider) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar07.211518.1957@utexas.edu> Date: Tue, 07 Mar 1995 21:15:18 GMT References: <1995Mar04.033118.3364@unam.mx> <1995Mar05.172518.6338@u-tokyo.ac.jp> <1995Mar07.071918.3479@purdue.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Mar07.071918.3479@purdue.edu>, dkarlsson@purdue.edu (Dave Karlsson) writes: > PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Tobias Schneider *PLONK* filter active for trolls. PC-9821Ap2 (NEC) - NetBSD 1.0 From tmoreau@kth.se Wed Mar 08 07:00:18 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!kth!tmoreau From: tmoreau@kth.se (Tomas Moreau) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar08.070018.6783@kth.se> Date: Wed, 08 Mar 1995 07:00:18 GMT References: <1995Mar04.033118.3364@unam.mx> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Mar04.033118.3364@unam.mx>, emoreno@unam.mx (Élodie Moreno) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. If you are posting from AOL, please read RFC 1036 before posting again. -- Tomas Moreau *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0