From dlarsson@kth.se Fri Jun 02 06:11:21 1995 Path: ashpoly!cascade!bigsur!kth!dlarsson From: dlarsson@kth.se (Dave Larsson) Newsgroups: comp.sys.m68k Subject: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun02.061121.3647@kth.se> Date: Fri, 02 Jun 1995 06:11:21 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. 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. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Dave Larsson "We don't sign stars. We build them." Acorn RiscPC 600 / SunOS 4.1.4 From jandersson@u-tokyo.ac.jp Fri Jun 02 07:42:21 1995 Path: ashpoly!cascade!transat!ukc!fennimore!u-tokyo!jandersson From: jandersson@u-tokyo.ac.jp (Jen Andersson) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun02.074221.3081@u-tokyo.ac.jp> Date: Fri, 02 Jun 1995 07:42:21 GMT References: <1995Jun02.061121.3647@kth.se> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Jun02.061121.3647@kth.se>, dlarsson@kth.se (Dave Larsson) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Jen Andersson US Robotics Courier V.34 @ 9600 Telebit bps "A soul is not exclusive to biology." From dmartinez@u-tokyo.ac.jp Fri Jun 02 13:26:21 1995 Path: ashpoly!cascade!brgate!saturno!u-tokyo!dmartinez From: dmartinez@u-tokyo.ac.jp (Diego Martínez) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun02.132621.4169@u-tokyo.ac.jp> Date: Fri, 02 Jun 1995 13:26:21 GMT References: <1995Jun02.061121.3647@kth.se> <1995Jun02.074221.3081@u-tokyo.ac.jp> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Jun02.074221.3081@u-tokyo.ac.jp>, jandersson@u-tokyo.ac.jp (Jen Andersson) writes: > Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. Top-posters will be placed in my ~/.killfile without notice. -- Diego Martínez "When every node is whole, the channel opens." 486DX4/100 (FreeBSD 2.0.5) / SunOS 4.1.4 From osmirnov@berkeley.edu Fri Jun 02 16:07:21 1995 Path: ashpoly!cascade!mxgate!coyoacan!berkeley!osmirnov From: osmirnov@berkeley.edu (Olga Smirnov) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun02.160721.1362@berkeley.edu> Date: Fri, 02 Jun 1995 16:07:21 GMT References: <1995Jun02.061121.3647@kth.se> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jun02.061121.3647@kth.se>, dlarsson@kth.se (Dave Larsson) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- === Olga Smirnov === Dept of Electrical Engineering, UC Berkeley Department of EECS "The hatch is open. Is anyone listening?"