From srodriguez@kiae.su Fri Mar 10 09:48:48 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!kiae!srodriguez
From: srodriguez@kiae.su (Sun-mi Rodríguez)
Newsgroups: comp.sys.m68k
Subject: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Mar10.094848.2177@kiae.su>
Date: Fri, 10 Mar 1995 09:48:48 GMT
Organization: Kurchatov Institute of Atomic Energy, Moscow
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Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.

I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz.
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?

-- 
Sun-mi Rodríguez | srodriguez@kiae.su
PGP Key fingerprint: A094 8C80 F9AE 0A45
"Keep the channels open."

From iduarte@stanford.edu Fri Mar 10 21:36:48 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!stanford!iduarte
From: iduarte@stanford.edu (Ines Duarte)
Newsgroups: comp.sys.m68k
Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Mar10.213648.5743@stanford.edu>
Date: Fri, 10 Mar 1995 21:36:48 GMT
References: <1995Mar10.094848.2177@kiae.su>
Organization: Stanford University Computer Systems Lab
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In article <1995Mar10.094848.2177@kiae.su>, srodriguez@kiae.su (Sun-mi Rodríguez) 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.

Unsubscribe me from this list! (Wait, this is Usenet, never mind).

-- 
Ines Duarte -- Stanford University Computer Systems Lab
"Row 14. No joke."

From tnilsson@rwth-aachen.de Sat Mar 11 20:07:48 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!rwth-aachen!tnilsson
From: tnilsson@rwth-aachen.de (Thiago Nilsson)
Newsgroups: comp.sys.m68k
Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Mar11.200748.2541@rwth-aachen.de>
Date: Sat, 11 Mar 1995 20:07:48 GMT
References: <1995Mar10.094848.2177@kiae.su> <1995Mar10.213648.5743@stanford.edu>
Organization: RWTH Aachen Informatik
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In article <1995Mar10.213648.5743@stanford.edu>, iduarte@stanford.edu (Ines Duarte) 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.

-- 
Thiago Nilsson
Tape trading list upon request. SASE required for international mail.