From thernandez@titech.ac.jp Thu Sep 07 18:06:40 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!titech!thernandez From: thernandez@titech.ac.jp (Thiago Hernández) Newsgroups: comp.sys.m68k Subject: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep07.180640.4789@titech.ac.jp> Date: Thu, 07 Sep 1995 18:06:40 GMT Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp 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. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Thiago Hernández Opinions expressed are solely my own and not those of Tokyo Institute of Technology Computer Centre. ------------------------------------------------------------ From acampbell@u-tokyo.ac.jp Sat Sep 09 17:10:40 1995 Path: ashpoly!cascade!brgate!saturno!u-tokyo!acampbell From: acampbell@u-tokyo.ac.jp (Anja Campbell) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep09.171040.7408@u-tokyo.ac.jp> Date: Sat, 09 Sep 1995 17:10:40 GMT References: <1995Sep07.180640.4789@titech.ac.jp> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Sep07.180640.4789@titech.ac.jp>, thernandez@titech.ac.jp (Thiago Hernández) writes: > 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. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Anja Campbell "There are 14 nodes and only 10 countries. Count again." Pentium 90 (OS/2 Warp) / TOS 4.04 From trobertson@mit.edu Mon Sep 11 04:48:40 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!mit!trobertson From: trobertson@mit.edu (Tomas Robertson) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep11.044840.7959@mit.edu> Date: Mon, 11 Sep 1995 04:48:40 GMT References: <1995Sep07.180640.4789@titech.ac.jp> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Sep07.180640.4789@titech.ac.jp>, thernandez@titech.ac.jp (Thiago Hernández) writes: > 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. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Tomas Robertson | trobertson@mit.edu PGP Key fingerprint: 9FE7 4E08 A011 320E "Keep the channels open." From ygarcia@cmu.edu Tue Sep 12 01:09:40 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cmu!ygarcia From: ygarcia@cmu.edu (Yuki García) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep12.010940.3859@cmu.edu> Date: Tue, 12 Sep 1995 01:09:40 GMT References: <1995Sep07.180640.4789@titech.ac.jp> <1995Sep09.171040.7408@u-tokyo.ac.jp> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Sep09.171040.7408@u-tokyo.ac.jp>, acampbell@u-tokyo.ac.jp (Anja Campbell) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Yuki García "In theory there is no difference between theory and practice." 486DX2/66 (Linux 1.2.13) / NEXTSTEP 3.3 From tramirez@kth.se Wed Sep 13 13:16:40 1995 Path: ashpoly!cascade!brgate!saturno!kth!tramirez From: tramirez@kth.se (Takeshi Ramírez) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep13.131640.5376@kth.se> Date: Wed, 13 Sep 1995 13:16:40 GMT References: <1995Sep07.180640.4789@titech.ac.jp> <1995Sep09.171040.7408@u-tokyo.ac.jp> <1995Sep12.010940.3859@cmu.edu> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Sep12.010940.3859@cmu.edu>, ygarcia@cmu.edu (Yuki García) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Takeshi Ramírez -- Royal Institute of Technology, Stockholm "5 sigma is a discovery. 7 is a question."