From dtanaka@clari.net Sat Jun 24 15:53:56 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!clari!dtanaka From: dtanaka@clari.net (Diego Tanaka) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun24.155356.5870@clari.net> Date: Sat, 24 Jun 1995 15:53:56 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 11 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. 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! -- Diego Tanaka SupraFAXModem 28.8 @ 28,800 bps "The hatch is open. Is anyone listening?" From jnovak@kiae.su Sat Jun 24 21:12:56 1995 Path: ashpoly!cascade!bigsur!kiae!jnovak From: jnovak@kiae.su (Joachim Novak) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun24.211256.3553@kiae.su> Date: Sat, 24 Jun 1995 21:12:56 GMT References: <1995Jun24.155356.5870@clari.net> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1995Jun24.155356.5870@clari.net>, dtanaka@clari.net (Diego Tanaka) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > 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! Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Joachim Novak Opinions expressed are solely my own and not those of Kurchatov Institute of Atomic Energy, Moscow. ------------------------------------------------------------ From aramirez@uu.net Mon Jun 26 11:27:56 1995 Path: ashpoly!cascade!mxgate!coyoacan!uu!aramirez From: aramirez@uu.net (Amy Ramírez) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun26.112756.3524@uu.net> Date: Mon, 26 Jun 1995 11:27:56 GMT References: <1995Jun24.155356.5870@clari.net> <1995Jun24.211256.3553@kiae.su> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jun24.211256.3553@kiae.su>, jnovak@kiae.su (Joachim Novak) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! > Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Amy Ramírez Tape trading list upon request. SASE required for international mail. From hfournier@cmu.edu Wed Jun 28 05:29:56 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!cmu!hfournier From: hfournier@cmu.edu (Heather Fournier) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun28.052956.4200@cmu.edu> Date: Wed, 28 Jun 1995 05:29:56 GMT References: <1995Jun24.155356.5870@clari.net> <1995Jun24.211256.3553@kiae.su> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1995Jun24.211256.3553@kiae.su>, jnovak@kiae.su (Joachim Novak) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! > Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. 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! -- Heather Fournier Opinions expressed are solely my own and not those of Carnegie Mellon University School of CS. ------------------------------------------------------------ From tsantos@uni-hamburg.de Thu Jun 29 22:04:56 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!uni-hamburg!tsantos From: tsantos@uni-hamburg.de (Thiago Santos) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun29.220456.7743@uni-hamburg.de> Date: Thu, 29 Jun 1995 22:04:56 GMT References: <1995Jun24.155356.5870@clari.net> <1995Jun24.211256.3553@kiae.su> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Jun24.211256.3553@kiae.su>, jnovak@kiae.su (Joachim Novak) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Thiago Santos Tape trading list upon request. SASE required for international mail.