From ksouza@utexas.edu Thu Sep 28 14:53:51 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!utexas!ksouza From: ksouza@utexas.edu (Karen Souza) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep28.145351.7995@utexas.edu> Date: Thu, 28 Sep 1995 14:53:51 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 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! 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? -- Karen Souza Tape trading list upon request. SASE required for international mail. From mkowalski@hanse.de Fri Sep 29 22:30:51 1995 Path: ashpoly!cascade!bigsur!hanse!mkowalski From: mkowalski@hanse.de (Marisol Kowalski) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep29.223051.7574@hanse.de> Date: Fri, 29 Sep 1995 22:30:51 GMT References: <1995Sep28.145351.7995@utexas.edu> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Sep28.145351.7995@utexas.edu>, ksouza@utexas.edu (Karen Souza) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Marisol Kowalski SupraFAXModem 28.8 @ 14,400 bps "Hardware is temporary. The signal survives." From klee@tum.de Sun Oct 01 05:32:51 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!tum!klee From: klee@tum.de (Kirsty Lee) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct01.053251.7396@tum.de> Date: Sun, 01 Oct 1995 05:32:51 GMT References: <1995Sep28.145351.7995@utexas.edu> <1995Sep29.223051.7574@hanse.de> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Sep29.223051.7574@hanse.de>, mkowalski@hanse.de (Marisol Kowalski) 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. > Unsubscribe me from this list! (Wait, this is Usenet, never mind). Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Kirsty Lee *PLONK* filter active for trolls. PC-9821Ap2 (NEC) - NetBSD 1.0 From nhughes@cern.ch Mon Oct 02 04:28:51 1995 Path: ashpoly!cascade!mxgate!coyoacan!cern!nhughes From: nhughes@cern.ch (Nadine Hughes) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct02.042851.1441@cern.ch> Date: Mon, 02 Oct 1995 04:28:51 GMT References: <1995Sep28.145351.7995@utexas.edu> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Sep28.145351.7995@utexas.edu>, ksouza@utexas.edu (Karen Souza) 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! Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Nadine Hughes -- European Laboratory for Particle Physics, Geneva "Row 14. No joke."