From mkarlsson@panix.com Wed May 10 07:38:17 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!panix!mkarlsson From: mkarlsson@panix.com (Mikhail Karlsson) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May10.073817.5200@panix.com> Date: Wed, 10 May 1995 07:38:17 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com 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. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- === Mikhail Karlsson === Dept of Electrical Engineering, Public Access Unix of New York "When every node is whole, the channel opens." From tsato@hanse.de Thu May 11 12:39:17 1995 Path: ashpoly!cascade!mxgate!coyoacan!hanse!tsato From: tsato@hanse.de (Tomas Sato) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May11.123917.3506@hanse.de> Date: Thu, 11 May 1995 12:39:17 GMT References: <1995May10.073817.5200@panix.com> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995May10.073817.5200@panix.com>, mkarlsson@panix.com (Mikhail Karlsson) 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. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Tomas Sato -- Hanse-Netzwerk Hamburg "Row 14. No joke." From gpopov@mit.edu Fri May 12 09:14:17 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!mit!gpopov From: gpopov@mit.edu (Graham Popov) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May12.091417.9716@mit.edu> Date: Fri, 12 May 1995 09:14:17 GMT References: <1995May10.073817.5200@panix.com> <1995May11.123917.3506@hanse.de> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995May11.123917.3506@hanse.de>, tsato@hanse.de (Tomas Sato) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Graham Popov -- Massachusetts Institute of Technology "Extraordinary claims require extraordinary spectra." From hbrennan@unam.mx Sun May 14 02:44:17 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!unam!hbrennan From: hbrennan@unam.mx (Hugo Brennan) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May14.024417.5920@unam.mx> Date: Sun, 14 May 1995 02:44:17 GMT References: <1995May10.073817.5200@panix.com> <1995May11.123917.3506@hanse.de> <1995May12.091417.9716@mit.edu> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995May12.091417.9716@mit.edu>, gpopov@mit.edu (Graham Popov) 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. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Hugo Brennan *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0 From avasiliev@kth.se Tue May 16 00:32:17 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!kth!avasiliev From: avasiliev@kth.se (Anja Vasiliev) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May16.003217.9464@kth.se> Date: Tue, 16 May 1995 00:32:17 GMT References: <1995May10.073817.5200@panix.com> <1995May11.123917.3506@hanse.de> <1995May12.091417.9716@mit.edu> <1995May14.024417.5920@unam.mx> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995May14.024417.5920@unam.mx>, hbrennan@unam.mx (Hugo Brennan) 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. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Anja Vasiliev "Do not worship the copy." Atari Falcon 030 / NEXTSTEP 3.3