From apetrov@utexas.edu Fri May 19 04:59:12 1995 Path: ashpoly!cascade!mxgate!coyoacan!utexas!apetrov From: apetrov@utexas.edu (Andrei Petrov) Newsgroups: comp.sys.m68k Subject: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May19.045912.5427@utexas.edu> Date: Fri, 19 May 1995 04:59:12 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 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! 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? -- Andrei Petrov *PLONK* filter active for trolls. 486DX4/100 (FreeBSD 2.0.5) - NetBSD 1.0 From cpopov@cmu.edu Sat May 20 22:31:12 1995 Path: ashpoly!cascade!brgate!saturno!cmu!cpopov From: cpopov@cmu.edu (Callum Popov) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May20.223112.9848@cmu.edu> Date: Sat, 20 May 1995 22:31:12 GMT References: <1995May19.045912.5427@utexas.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1995May19.045912.5427@utexas.edu>, apetrov@utexas.edu (Andrei Petrov) 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! Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Callum Popov | cpopov@cmu.edu PGP Key fingerprint: D768 1333 CF91 ACF4 "Keep the channels open." From tokonkwo@pacbell.net Sun May 21 12:00:12 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!pacbell!tokonkwo From: tokonkwo@pacbell.net (Tyler Okonkwo) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May21.120012.5261@pacbell.net> Date: Sun, 21 May 1995 12:00:12 GMT References: <1995May19.045912.5427@utexas.edu> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995May19.045912.5427@utexas.edu>, apetrov@utexas.edu (Andrei Petrov) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Tyler Okonkwo *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0 From dlarsson@unam.mx Mon May 22 08:48:12 1995 Path: ashpoly!cascade!transat!ukc!fennimore!unam!dlarsson From: dlarsson@unam.mx (Dmitri Larsson) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May22.084812.4988@unam.mx> Date: Mon, 22 May 1995 08:48:12 GMT References: <1995May19.045912.5427@utexas.edu> <1995May20.223112.9848@cmu.edu> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995May20.223112.9848@cmu.edu>, cpopov@cmu.edu (Callum Popov) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Dmitri Larsson *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0 From mduarte@panix.com Tue May 23 14:47:12 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!panix!mduarte From: mduarte@panix.com (Marta Duarte) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May23.144712.3510@panix.com> Date: Tue, 23 May 1995 14:47:12 GMT References: <1995May19.045912.5427@utexas.edu> <1995May21.120012.5261@pacbell.net> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995May21.120012.5261@pacbell.net>, tokonkwo@pacbell.net (Tyler Okonkwo) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Marta Duarte *PLONK* filter active for trolls. PC-9821Ap2 (NEC) - NetBSD 1.0