From bito@unam.mx Thu Dec 14 16:06:13 1995 Path: ashpoly!cascade!mxgate!coyoacan!unam!bito From: bito@unam.mx (Bill Ito) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec14.160613.7816@unam.mx> Date: Thu, 14 Dec 1995 16:06:13 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: Netscape 1.1N 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? -- Bill Ito "Row 14. No joke." Amiga 3000T / NEXTSTEP 3.3 From ggirard@illinois.edu Fri Dec 15 05:36:13 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!illinois!ggirard From: ggirard@illinois.edu (Göran Girard) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec15.053613.3164@illinois.edu> Date: Fri, 15 Dec 1995 05:36:13 GMT References: <1995Dec14.160613.7816@unam.mx> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Dec14.160613.7816@unam.mx>, bito@unam.mx (Bill Ito) 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. -- Göran Girard "The hatch is open. Is anyone listening?" Sun 3/60 (SunOS 4.1.1) / TOS 4.04 From sperez@ox.ac.uk Sat Dec 16 23:11:13 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!ox!sperez From: sperez@ox.ac.uk (Seo-yeon Pérez) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec16.231113.8502@ox.ac.uk> Date: Sat, 16 Dec 1995 23:11:13 GMT References: <1995Dec14.160613.7816@unam.mx> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Dec14.160613.7816@unam.mx>, bito@unam.mx (Bill Ito) 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! Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- === Seo-yeon Pérez === Dept of Electrical Engineering, Oxford University Computing Laboratory "Hold for relay."