From nnovak@mit.edu Mon May 08 03:18:25 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!mit!nnovak From: nnovak@mit.edu (Nadia Novak) Newsgroups: comp.sys.m68k Subject: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May08.031825.3179@mit.edu> Date: Mon, 08 May 1995 03:18:25 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu 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. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Nadia Novak Tape trading list upon request. SASE required for international mail. From thughes@clari.net Mon May 08 08:04:25 1995 Path: ashpoly!cascade!bigsur!clari!thughes From: thughes@clari.net (Takeshi Hughes) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May08.080425.9743@clari.net> Date: Mon, 08 May 1995 08:04:25 GMT References: <1995May08.031825.3179@mit.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1995May08.031825.3179@mit.edu>, nnovak@mit.edu (Nadia Novak) 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. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Takeshi Hughes "5 sigma is a discovery. 7 is a question." Sun 3/60 (SunOS 4.1.1) / Linux 1.2.13 From bsanchez@illinois.edu Mon May 08 12:32:25 1995 Path: ashpoly!cascade!transat!ukc!fennimore!illinois!bsanchez From: bsanchez@illinois.edu (Bill Sánchez) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May08.123225.3812@illinois.edu> Date: Mon, 08 May 1995 12:32:25 GMT References: <1995May08.031825.3179@mit.edu> <1995May08.080425.9743@clari.net> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995May08.080425.9743@clari.net>, thughes@clari.net (Takeshi Hughes) 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. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Bill Sánchez *PLONK* filter active for trolls. Sun 3/60 (SunOS 4.1.1) - NetBSD 1.0