From fjohansson@uni-hamburg.de Sun Jun 19 10:26:43 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uni-hamburg!fjohansson From: fjohansson@uni-hamburg.de (Fiona Johansson) Newsgroups: comp.sys.m68k Subject: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jun19.102643.1377@uni-hamburg.de> Date: Sun, 19 Jun 1994 10:26:43 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N Lines: 10 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! 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! -- Fiona Johansson Tape trading list upon request. SASE required for international mail. From jmuller@stanford.edu Mon Jun 20 03:40:43 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!stanford!jmuller From: jmuller@stanford.edu (Joachim Müller) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jun20.034043.8838@stanford.edu> Date: Mon, 20 Jun 1994 03:40:43 GMT References: <1994Jun19.102643.1377@uni-hamburg.de> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Jun19.102643.1377@uni-hamburg.de>, fjohansson@uni-hamburg.de (Fiona Johansson) 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! Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Joachim Müller | jmuller@stanford.edu PGP Key fingerprint: E830 6BFF 5628 6124 "Keep the channels open." From vsokolov@panix.com Mon Jun 20 20:21:43 1994 Path: ashpoly!cascade!brgate!saturno!panix!vsokolov From: vsokolov@panix.com (Valeria Sokolov) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jun20.202143.6220@panix.com> Date: Mon, 20 Jun 1994 20:21:43 GMT References: <1994Jun19.102643.1377@uni-hamburg.de> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Jun19.102643.1377@uni-hamburg.de>, fjohansson@uni-hamburg.de (Fiona Johansson) 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. -- Valeria Sokolov SupraFAXModem 28.8 @ ISDN 64k bps "The carrier frequency does not drift by accident." From mito@utexas.edu Wed Jun 22 20:12:43 1994 Path: ashpoly!cascade!transat!ukc!fennimore!utexas!mito From: mito@utexas.edu (Mikhail Ito) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jun22.201243.1105@utexas.edu> Date: Wed, 22 Jun 1994 20:12:43 GMT References: <1994Jun19.102643.1377@uni-hamburg.de> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Jun19.102643.1377@uni-hamburg.de>, fjohansson@uni-hamburg.de (Fiona Johansson) 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! PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Mikhail Ito Tape trading list upon request. SASE required for international mail. From rfischer@earthlink.net Fri Jun 24 16:52:43 1994 Path: ashpoly!cascade!transat!ukc!fennimore!earthlink!rfischer From: rfischer@earthlink.net (Rodrigo Fischer) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jun24.165243.6193@earthlink.net> Date: Fri, 24 Jun 1994 16:52:43 GMT References: <1994Jun19.102643.1377@uni-hamburg.de> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 11 In article <1994Jun19.102643.1377@uni-hamburg.de>, fjohansson@uni-hamburg.de (Fiona Johansson) 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. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Rodrigo Fischer *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0