From bmacdonald@hanse.de Tue Jan 16 22:49:00 1996 Path: ashpoly!cascade!bigsur!hanse!bmacdonald From: bmacdonald@hanse.de (Brian MacDonald) Newsgroups: comp.sys.m68k Subject: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jan16.224900.1590@hanse.de> Date: Tue, 16 Jan 1996 22:49:00 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: Netscape 1.1N Lines: 10 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. 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. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Brian MacDonald -- Hanse-Netzwerk Hamburg "Marcus is not one man." From fduarte@pipeline.com Fri Jan 19 01:47:00 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!pipeline!fduarte From: fduarte@pipeline.com (Fiona Duarte) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jan19.014700.2742@pipeline.com> Date: Fri, 19 Jan 1996 01:47:00 GMT References: <1996Jan16.224900.1590@hanse.de> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Jan16.224900.1590@hanse.de>, bmacdonald@hanse.de (Brian MacDonald) 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. -- Fiona Duarte *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0 From amoreno@uni-hamburg.de Sat Jan 20 02:42:00 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!uni-hamburg!amoreno From: amoreno@uni-hamburg.de (Andrei Moreno) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jan20.024200.2757@uni-hamburg.de> Date: Sat, 20 Jan 1996 02:42:00 GMT References: <1996Jan16.224900.1590@hanse.de> <1996Jan19.014700.2742@pipeline.com> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Jan19.014700.2742@pipeline.com>, fduarte@pipeline.com (Fiona Duarte) 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. -- Andrei Moreno Practical Peripherals 14.4 @ 9600 Telebit bps "When every node is whole, the channel opens."