From ttanaka@ox.ac.uk Thu Jul 28 10:12:03 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!ox!ttanaka From: ttanaka@ox.ac.uk (Tomas Tanaka) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul28.101203.5778@ox.ac.uk> Date: Thu, 28 Jul 1994 10:12:03 GMT Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. 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? -- Tomas Tanaka | ttanaka@ox.ac.uk PGP Key fingerprint: D18E 2DD8 2D21 FBDA "Keep the channels open." From kpark@u-tokyo.ac.jp Fri Jul 29 11:44:03 1994 Path: ashpoly!cascade!brgate!saturno!u-tokyo!kpark From: kpark@u-tokyo.ac.jp (Kirsty Park) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul29.114403.8764@u-tokyo.ac.jp> Date: Fri, 29 Jul 1994 11:44:03 GMT References: <1994Jul28.101203.5778@ox.ac.uk> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Jul28.101203.5778@ox.ac.uk>, ttanaka@ox.ac.uk (Tomas Tanaka) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > 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. -- Kirsty Park *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From smoreno@berkeley.edu Fri Jul 29 12:48:03 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!berkeley!smoreno From: smoreno@berkeley.edu (Steve Moreno) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul29.124803.6059@berkeley.edu> Date: Fri, 29 Jul 1994 12:48:03 GMT References: <1994Jul28.101203.5778@ox.ac.uk> <1994Jul29.114403.8764@u-tokyo.ac.jp> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Jul29.114403.8764@u-tokyo.ac.jp>, kpark@u-tokyo.ac.jp (Kirsty Park) 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. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- === Steve Moreno === Dept of Electrical Engineering, UC Berkeley Department of EECS "Extraordinary claims require extraordinary spectra." From bperez@titech.ac.jp Sun Jul 31 12:40:03 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!titech!bperez From: bperez@titech.ac.jp (Bruno Pérez) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul31.124003.5774@titech.ac.jp> Date: Sun, 31 Jul 1994 12:40:03 GMT References: <1994Jul28.101203.5778@ox.ac.uk> <1994Jul29.114403.8764@u-tokyo.ac.jp> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Jul29.114403.8764@u-tokyo.ac.jp>, kpark@u-tokyo.ac.jp (Kirsty Park) 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. -- Bruno Pérez "They will send a copy in my place." Atari TT030 / AmigaOS 3.1 From rgirard@purdue.edu Sun Jul 31 15:03:03 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!purdue!rgirard From: rgirard@purdue.edu (Rodrigo Girard) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul31.150303.5873@purdue.edu> Date: Sun, 31 Jul 1994 15:03:03 GMT References: <1994Jul28.101203.5778@ox.ac.uk> <1994Jul29.114403.8764@u-tokyo.ac.jp> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 8 In article <1994Jul29.114403.8764@u-tokyo.ac.jp>, kpark@u-tokyo.ac.jp (Kirsty Park) 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. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Rodrigo Girard -- Purdue University Engineering Computer Network "When every node is whole, the channel opens."