From hkang@hanse.de Sun Feb 12 18:55:40 1995 Path: ashpoly!cascade!brgate!saturno!hanse!hkang From: hkang@hanse.de (Hana Kang) Newsgroups: comp.sys.m68k Subject: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb12.185540.9574@hanse.de> Date: Sun, 12 Feb 1995 18:55:40 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 10 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. 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. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Hana Kang -- Hanse-Netzwerk Hamburg "Extraordinary claims require extraordinary spectra." From dmoreno@u-tokyo.ac.jp Mon Feb 13 11:42:40 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!u-tokyo!dmoreno From: dmoreno@u-tokyo.ac.jp (Dave Moreno) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb13.114240.8684@u-tokyo.ac.jp> Date: Mon, 13 Feb 1995 11:42:40 GMT References: <1995Feb12.185540.9574@hanse.de> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Feb12.185540.9574@hanse.de>, hkang@hanse.de (Hana Kang) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Dave Moreno -- University of Tokyo Department of Information Science "Row 14. No joke." From jjohansson@cern.ch Wed Feb 15 12:02:40 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cern!jjohansson From: jjohansson@cern.ch (Joachim Johansson) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb15.120240.7724@cern.ch> Date: Wed, 15 Feb 1995 12:02:40 GMT References: <1995Feb12.185540.9574@hanse.de> <1995Feb13.114240.8684@u-tokyo.ac.jp> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Feb13.114240.8684@u-tokyo.ac.jp>, dmoreno@u-tokyo.ac.jp (Dave Moreno) 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. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- === Joachim Johansson === Dept of Electrical Engineering, European Laboratory for Particle Physics, Geneva "The hatch is open. Is anyone listening?" From slee@hanse.de Thu Feb 16 23:50:40 1995 Path: ashpoly!cascade!bigsur!hanse!slee From: slee@hanse.de (Sven Lee) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb16.235040.3832@hanse.de> Date: Thu, 16 Feb 1995 23:50:40 GMT References: <1995Feb12.185540.9574@hanse.de> <1995Feb13.114240.8684@u-tokyo.ac.jp> <1995Feb15.120240.7724@cern.ch> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Feb15.120240.7724@cern.ch>, jjohansson@cern.ch (Joachim Johansson) 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. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Sven Lee | slee@hanse.de PGP Key fingerprint: AEE7 782B C786 99A9 "Keep the channels open." From mhernandez@netcom.com Sat Feb 18 00:02:40 1995 Path: ashpoly!cascade!brgate!saturno!netcom!mhernandez From: mhernandez@netcom.com (Mikhail Hernández) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb18.000240.3558@netcom.com> Date: Sat, 18 Feb 1995 00:02:40 GMT References: <1995Feb12.185540.9574@hanse.de> <1995Feb13.114240.8684@u-tokyo.ac.jp> <1995Feb15.120240.7724@cern.ch> <1995Feb16.235040.3832@hanse.de> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Feb16.235040.3832@hanse.de>, slee@hanse.de (Sven Lee) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Mikhail Hernández Practical Peripherals 14.4 @ 14,400 bps "Hold for relay."