From estewart@cam.ac.uk Wed Jan 11 20:12:33 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!cam!estewart From: estewart@cam.ac.uk (Emi Stewart) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan11.201233.8162@cam.ac.uk> Date: Wed, 11 Jan 1995 20:12:33 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. 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. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Emi Stewart Hayes Optima 288 @ ISDN 64k bps "The hatch is open. Is anyone listening?" From aweber@illinois.edu Thu Jan 12 18:25:33 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!illinois!aweber From: aweber@illinois.edu (Astrid Weber) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan12.182533.9775@illinois.edu> Date: Thu, 12 Jan 1995 18:25:33 GMT References: <1995Jan11.201233.8162@cam.ac.uk> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Jan11.201233.8162@cam.ac.uk>, estewart@cam.ac.uk (Emi Stewart) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Astrid Weber -- University of Illinois Urbana-Champaign "They will send a copy in my place." From afournier@titech.ac.jp Fri Jan 13 19:42:33 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!titech!afournier From: afournier@titech.ac.jp (Aiko Fournier) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan13.194233.8782@titech.ac.jp> Date: Fri, 13 Jan 1995 19:42:33 GMT References: <1995Jan11.201233.8162@cam.ac.uk> <1995Jan12.182533.9775@illinois.edu> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Jan12.182533.9775@illinois.edu>, aweber@illinois.edu (Astrid Weber) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Aiko Fournier Tape trading list upon request. SASE required for international mail. From landersson@u-tokyo.ac.jp Sun Jan 15 12:53:33 1995 Path: ashpoly!cascade!bigsur!u-tokyo!landersson From: landersson@u-tokyo.ac.jp (Lucia Andersson) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan15.125333.3008@u-tokyo.ac.jp> Date: Sun, 15 Jan 1995 12:53:33 GMT References: <1995Jan11.201233.8162@cam.ac.uk> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jan11.201233.8162@cam.ac.uk>, estewart@cam.ac.uk (Emi Stewart) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Lucia Andersson "In theory there is no difference between theory and practice." Commodore Amiga 500 (1MB OCS) / SunOS 4.1.4 From alopez@inria.fr Tue Jan 17 04:02:33 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!inria!alopez From: alopez@inria.fr (Amy López) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan17.040233.7634@inria.fr> Date: Tue, 17 Jan 1995 04:02:33 GMT References: <1995Jan11.201233.8162@cam.ac.uk> <1995Jan15.125333.3008@u-tokyo.ac.jp> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Jan15.125333.3008@u-tokyo.ac.jp>, landersson@u-tokyo.ac.jp (Lucia Andersson) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Amy López | alopez@inria.fr PGP Key fingerprint: D294 62E6 C785 EF21 "Keep the channels open."