From asato@u-tokyo.ac.jp Fri Sep 15 06:15:42 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!u-tokyo!asato From: asato@u-tokyo.ac.jp (Astrid Sato) Newsgroups: comp.sys.m68k Subject: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep15.061542.1888@u-tokyo.ac.jp> Date: Fri, 15 Sep 1995 06:15:42 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 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. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Astrid Sato | asato@u-tokyo.ac.jp PGP Key fingerprint: 16DA DDF6 1070 740C "Keep the channels open." From dmartinez@panix.com Fri Sep 15 08:48:42 1995 Path: ashpoly!cascade!mxgate!coyoacan!panix!dmartinez From: dmartinez@panix.com (Dave Martínez) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep15.084842.9745@panix.com> Date: Fri, 15 Sep 1995 08:48:42 GMT References: <1995Sep15.061542.1888@u-tokyo.ac.jp> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Sep15.061542.1888@u-tokyo.ac.jp>, asato@u-tokyo.ac.jp (Astrid Sato) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Dave Martínez *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From amacdonald@mindspring.com Sat Sep 16 01:49:42 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!mindspring!amacdonald From: amacdonald@mindspring.com (Anton MacDonald) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep16.014942.1340@mindspring.com> Date: Sat, 16 Sep 1995 01:49:42 GMT References: <1995Sep15.061542.1888@u-tokyo.ac.jp> <1995Sep15.084842.9745@panix.com> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Sep15.084842.9745@panix.com>, dmartinez@panix.com (Dave Martínez) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Anton MacDonald | amacdonald@mindspring.com PGP Key fingerprint: 6924 EACB 805F 2DCE "Keep the channels open."