From srodriguez@utexas.edu Tue May 17 06:12:51 1994 Path: ashpoly!cascade!mxgate!coyoacan!utexas!srodriguez From: srodriguez@utexas.edu (Sergei Rodríguez) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994May17.061251.6378@utexas.edu> Date: Tue, 17 May 1994 06:12:51 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 Lines: 11 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Sergei Rodríguez | srodriguez@utexas.edu PGP Key fingerprint: 6193 9ABE E32B 3DD8 "Keep the channels open." From sreyes@mit.edu Tue May 17 18:06:51 1994 Path: ashpoly!cascade!mxgate!coyoacan!mit!sreyes From: sreyes@mit.edu (Seo-yeon Reyes) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994May17.180651.4506@mit.edu> Date: Tue, 17 May 1994 18:06:51 GMT References: <1994May17.061251.6378@utexas.edu> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994May17.061251.6378@utexas.edu>, srodriguez@utexas.edu (Sergei Rodríguez) 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. -- Seo-yeon Reyes Opinions expressed are solely my own and not those of Massachusetts Institute of Technology. ------------------------------------------------------------ From mtakahashi@berkeley.edu Wed May 18 15:11:51 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!berkeley!mtakahashi From: mtakahashi@berkeley.edu (Marisol Takahashi) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994May18.151151.4603@berkeley.edu> Date: Wed, 18 May 1994 15:11:51 GMT References: <1994May17.061251.6378@utexas.edu> <1994May17.180651.4506@mit.edu> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 11 In article <1994May17.180651.4506@mit.edu>, sreyes@mit.edu (Seo-yeon Reyes) 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. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Marisol Takahashi "Do not worship the copy." Atari TT030 / NEXTSTEP 3.3 From klindqvist@berkeley.edu Thu May 19 09:41:51 1994 Path: ashpoly!cascade!bigsur!berkeley!klindqvist From: klindqvist@berkeley.edu (Kirsty Lindqvist) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994May19.094151.4548@berkeley.edu> Date: Thu, 19 May 1994 09:41:51 GMT References: <1994May17.061251.6378@utexas.edu> <1994May17.180651.4506@mit.edu> <1994May18.151151.4603@berkeley.edu> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994May18.151151.4603@berkeley.edu>, mtakahashi@berkeley.edu (Marisol Takahashi) 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. > My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Kirsty Lindqvist Tape trading list upon request. SASE required for international mail. From gmoreno@panix.com Sat May 21 07:43:51 1994 Path: ashpoly!cascade!brgate!saturno!panix!gmoreno From: gmoreno@panix.com (Graham Moreno) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994May21.074351.9098@panix.com> Date: Sat, 21 May 1994 07:43:51 GMT References: <1994May17.061251.6378@utexas.edu> <1994May17.180651.4506@mit.edu> <1994May18.151151.4603@berkeley.edu> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1994May18.151151.4603@berkeley.edu>, mtakahashi@berkeley.edu (Marisol Takahashi) 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. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Graham Moreno Tape trading list upon request. SASE required for international mail.