From mkarlsson@delphi.com Sun Dec 24 17:49:07 1995 Path: ashpoly!cascade!mxgate!coyoacan!delphi!mkarlsson From: mkarlsson@delphi.com (Min-jun Karlsson) Newsgroups: comp.sys.m68k Subject: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec24.174907.4109@delphi.com> Date: Sun, 24 Dec 1995 17:49:07 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com 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! 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. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Min-jun Karlsson *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0 From tperez@tum.de Mon Dec 25 08:53:07 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!tum!tperez From: tperez@tum.de (Takeshi Pérez) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec25.085307.2244@tum.de> Date: Mon, 25 Dec 1995 08:53:07 GMT References: <1995Dec24.174907.4109@delphi.com> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N Lines: 12 In article <1995Dec24.174907.4109@delphi.com>, mkarlsson@delphi.com (Min-jun Karlsson) 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! Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Takeshi Pérez "Marcus is not one man." Decstation 5000/200 / NEXTSTEP 3.3 From lchoi@pipeline.com Wed Dec 27 07:23:07 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pipeline!lchoi From: lchoi@pipeline.com (Liam Choi) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec27.072307.8066@pipeline.com> Date: Wed, 27 Dec 1995 07:23:07 GMT References: <1995Dec24.174907.4109@delphi.com> <1995Dec25.085307.2244@tum.de> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Dec25.085307.2244@tum.de>, tperez@tum.de (Takeshi Pérez) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! > Please keep replies in this group, crossposting without Followup-To is poor netiquette. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Top-posters will be placed in my ~/.killfile without notice. -- Liam Choi Tape trading list upon request. SASE required for international mail.