From ekarlsson@cam.ac.uk Sat Sep 23 01:48:21 1995 Path: ashpoly!cascade!bigsur!cam!ekarlsson From: ekarlsson@cam.ac.uk (Emi Karlsson) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep23.014821.3357@cam.ac.uk> Date: Sat, 23 Sep 1995 01:48:21 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. 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. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Emi Karlsson Opinions expressed are solely my own and not those of University of Cambridge Computer Laboratory. ------------------------------------------------------------ From yoliveira@mit.edu Sat Sep 23 20:26:21 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!mit!yoliveira From: yoliveira@mit.edu (Yuki Oliveira) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep23.202621.9035@mit.edu> Date: Sat, 23 Sep 1995 20:26:21 GMT References: <1995Sep23.014821.3357@cam.ac.uk> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Sep23.014821.3357@cam.ac.uk>, ekarlsson@cam.ac.uk (Emi Karlsson) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Yuki Oliveira Opinions expressed are solely my own and not those of Massachusetts Institute of Technology. ------------------------------------------------------------ From dsokolov@inria.fr Mon Sep 25 00:51:21 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!inria!dsokolov From: dsokolov@inria.fr (Dave Sokolov) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep25.005121.9164@inria.fr> Date: Mon, 25 Sep 1995 00:51:21 GMT References: <1995Sep23.014821.3357@cam.ac.uk> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Sep23.014821.3357@cam.ac.uk>, ekarlsson@cam.ac.uk (Emi Karlsson) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Dave Sokolov "The carrier frequency does not drift by accident." NeXTstation Turbo Color / Linux 1.2.13 From tsuzuki@demon.co.uk Tue Sep 26 11:42:21 1995 Path: ashpoly!cascade!brgate!saturno!demon!tsuzuki From: tsuzuki@demon.co.uk (Takeshi Suzuki) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep26.114221.2970@demon.co.uk> Date: Tue, 26 Sep 1995 11:42:21 GMT References: <1995Sep23.014821.3357@cam.ac.uk> <1995Sep25.005121.9164@inria.fr> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Sep25.005121.9164@inria.fr>, dsokolov@inria.fr (Dave Sokolov) writes: > PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Takeshi Suzuki "They will send a copy in my place." 486DX4/100 (FreeBSD 2.0.5) / FreeBSD 2.1