From jhernandez@berkeley.edu Wed Feb 23 02:06:27 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!berkeley!jhernandez From: jhernandez@berkeley.edu (Ji-woo Hernández) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Feb23.020627.4853@berkeley.edu> Date: Wed, 23 Feb 1994 02:06:27 GMT Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. 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. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Ji-woo Hernández -- UC Berkeley Department of EECS "Tape doesn't lie at 02:14. Ears do." From asouza@netcom.com Wed Feb 23 23:00:27 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!netcom!asouza From: asouza@netcom.com (Anton Souza) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Feb23.230027.6777@netcom.com> Date: Wed, 23 Feb 1994 23:00:27 GMT References: <1994Feb23.020627.4853@berkeley.edu> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Feb23.020627.4853@berkeley.edu>, jhernandez@berkeley.edu (Ji-woo Hernández) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > 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. -- Anton Souza *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0 From jgarcia@mit.edu Fri Feb 25 16:56:27 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!mit!jgarcia From: jgarcia@mit.edu (Julien García) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Feb25.165627.6504@mit.edu> Date: Fri, 25 Feb 1994 16:56:27 GMT References: <1994Feb23.020627.4853@berkeley.edu> <1994Feb23.230027.6777@netcom.com> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1994Feb23.230027.6777@netcom.com>, asouza@netcom.com (Anton Souza) 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. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Julien García Zyxel U-1496E @ 28,800 bps "Do not worship the copy." From bsilva@mindspring.com Sat Feb 26 17:11:27 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!mindspring!bsilva From: bsilva@mindspring.com (Bill Silva) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Feb26.171127.6117@mindspring.com> Date: Sat, 26 Feb 1994 17:11:27 GMT References: <1994Feb23.020627.4853@berkeley.edu> <1994Feb23.230027.6777@netcom.com> <1994Feb25.165627.6504@mit.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Feb25.165627.6504@mit.edu>, jgarcia@mit.edu (Julien García) writes: > 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. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Bill Silva *PLONK* filter active for trolls. Pentium 90 (OS/2 Warp) - NetBSD 1.0 From nsouza@kth.se Sun Feb 27 11:34:27 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!kth!nsouza From: nsouza@kth.se (Nadia Souza) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Feb27.113427.4048@kth.se> Date: Sun, 27 Feb 1994 11:34:27 GMT References: <1994Feb23.020627.4853@berkeley.edu> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Feb23.020627.4853@berkeley.edu>, jhernandez@berkeley.edu (Ji-woo Hernández) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Nadia Souza "We don't sign stars. We build them." PC-9821Ap2 (NEC) / NEXTSTEP 3.3