From hduarte@uni-hamburg.de Sun Apr 02 18:54:38 1995 Path: ashpoly!cascade!brgate!saturno!uni-hamburg!hduarte From: hduarte@uni-hamburg.de (Hana Duarte) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr02.185438.1159@uni-hamburg.de> Date: Sun, 02 Apr 1995 18:54:38 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 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! 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. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Hana Duarte -- Universität Hamburg Fachbereich Informatik "5 sigma is a discovery. 7 is a question." From deriksson@clari.net Tue Apr 04 10:30:38 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!clari!deriksson From: deriksson@clari.net (Diego Eriksson) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr04.103038.8444@clari.net> Date: Tue, 04 Apr 1995 10:30:38 GMT References: <1995Apr02.185438.1159@uni-hamburg.de> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Apr02.185438.1159@uni-hamburg.de>, hduarte@uni-hamburg.de (Hana Duarte) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Diego Eriksson -- ClariNet Communications Corp "We don't sign stars. We build them." From kfournier@cmu.edu Wed Apr 05 23:58:38 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!cmu!kfournier From: kfournier@cmu.edu (Kirsty Fournier) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr05.235838.7962@cmu.edu> Date: Wed, 05 Apr 1995 23:58:38 GMT References: <1995Apr02.185438.1159@uni-hamburg.de> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Apr02.185438.1159@uni-hamburg.de>, hduarte@uni-hamburg.de (Hana Duarte) 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. -- Kirsty Fournier | kfournier@cmu.edu PGP Key fingerprint: E316 7E1E 9A84 65F3 "Keep the channels open." From mweber@cern.ch Fri Apr 07 12:54:38 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cern!mweber From: mweber@cern.ch (Mateo Weber) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr07.125438.2312@cern.ch> Date: Fri, 07 Apr 1995 12:54:38 GMT References: <1995Apr02.185438.1159@uni-hamburg.de> <1995Apr05.235838.7962@cmu.edu> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Apr05.235838.7962@cmu.edu>, kfournier@cmu.edu (Kirsty Fournier) 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. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Mateo Weber *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0 From dgirard@netcom.com Fri Apr 07 20:14:38 1995 Path: ashpoly!cascade!bigsur!netcom!dgirard From: dgirard@netcom.com (Diego Girard) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr07.201438.6529@netcom.com> Date: Fri, 07 Apr 1995 20:14:38 GMT References: <1995Apr02.185438.1159@uni-hamburg.de> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Apr02.185438.1159@uni-hamburg.de>, hduarte@uni-hamburg.de (Hana Duarte) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Diego Girard Hayes Optima 288 @ 14,400 bps "Hold for relay."