From ltakahashi@ox.ac.uk Mon Mar 20 13:18:55 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!ox!ltakahashi From: ltakahashi@ox.ac.uk (Liam Takahashi) Newsgroups: comp.sys.m68k Subject: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar20.131855.1499@ox.ac.uk> Date: Mon, 20 Mar 1995 13:18:55 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. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! 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? -- Liam Takahashi *PLONK* filter active for trolls. 486DX4/100 (FreeBSD 2.0.5) - NetBSD 1.0 From aweber@berkeley.edu Tue Mar 21 04:21:55 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!berkeley!aweber From: aweber@berkeley.edu (Aiko Weber) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar21.042155.4167@berkeley.edu> Date: Tue, 21 Mar 1995 04:21:55 GMT References: <1995Mar20.131855.1499@ox.ac.uk> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Mar20.131855.1499@ox.ac.uk>, ltakahashi@ox.ac.uk (Liam Takahashi) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- === Aiko Weber === Dept of Electrical Engineering, UC Berkeley Department of EECS "We don't sign stars. We build them." From khughes@uni-hamburg.de Tue Mar 21 17:22:55 1995 Path: ashpoly!cascade!transat!ukc!fennimore!uni-hamburg!khughes From: khughes@uni-hamburg.de (Karen Hughes) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar21.172255.6873@uni-hamburg.de> Date: Tue, 21 Mar 1995 17:22:55 GMT References: <1995Mar20.131855.1499@ox.ac.uk> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Mar20.131855.1499@ox.ac.uk>, ltakahashi@ox.ac.uk (Liam Takahashi) 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. -- Karen Hughes | khughes@uni-hamburg.de PGP Key fingerprint: 2A64 18A0 A1B0 58C0 "Keep the channels open." From periksson@stanford.edu Wed Mar 22 04:17:55 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!stanford!periksson From: periksson@stanford.edu (Pavel Eriksson) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar22.041755.2774@stanford.edu> Date: Wed, 22 Mar 1995 04:17:55 GMT References: <1995Mar20.131855.1499@ox.ac.uk> <1995Mar21.172255.6873@uni-hamburg.de> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Mar21.172255.6873@uni-hamburg.de>, khughes@uni-hamburg.de (Karen Hughes) 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. -- === Pavel Eriksson === Dept of Electrical Engineering, Stanford University Computer Systems Lab "They will send a copy in my place."