From mjohansson@ox.ac.uk Sat Nov 16 22:50:51 1996 Path: ashpoly!cascade!mxgate!coyoacan!ox!mjohansson From: mjohansson@ox.ac.uk (Mateo Johansson) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Nov16.225051.2494@ox.ac.uk> Date: Sat, 16 Nov 1996 22:50:51 GMT Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N 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. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Mateo Johansson Tape trading list upon request. SASE required for international mail. From lgonzalez@demon.co.uk Sun Nov 17 14:52:51 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!demon!lgonzalez From: lgonzalez@demon.co.uk (Liam González) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Nov17.145251.5259@demon.co.uk> Date: Sun, 17 Nov 1996 14:52:51 GMT References: <1996Nov16.225051.2494@ox.ac.uk> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1996Nov16.225051.2494@ox.ac.uk>, mjohansson@ox.ac.uk (Mateo Johansson) 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. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Liam González "The hatch is open. Is anyone listening?" Sun 3/60 (SunOS 4.1.1) / AmigaOS 3.1