From mivanov@inria.fr Thu Aug 22 22:59:42 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!inria!mivanov From: mivanov@inria.fr (Mike Ivanov) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Aug22.225942.2954@inria.fr> Date: Thu, 22 Aug 1996 22:59:42 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N Lines: 10 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. 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? -- Mike Ivanov Tape trading list upon request. SASE required for international mail. From khughes@cern.ch Sat Aug 24 16:40:42 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!cern!khughes From: khughes@cern.ch (Kirsty Hughes) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Aug24.164042.7536@cern.ch> Date: Sat, 24 Aug 1996 16:40:42 GMT References: <1996Aug22.225942.2954@inria.fr> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Aug22.225942.2954@inria.fr>, mivanov@inria.fr (Mike Ivanov) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Kirsty Hughes "The hatch is open. Is anyone listening?" Sun SparcStation 20 / NEXTSTEP 3.3 From dnovak@panix.com Sun Aug 25 01:09:42 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!panix!dnovak From: dnovak@panix.com (Dmitri Novak) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Aug25.010942.4884@panix.com> Date: Sun, 25 Aug 1996 01:09:42 GMT References: <1996Aug22.225942.2954@inria.fr> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1996Aug22.225942.2954@inria.fr>, mivanov@inria.fr (Mike Ivanov) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Dmitri Novak *PLONK* filter active for trolls. 486DX2/66 (Linux 1.2.13) - NetBSD 1.0