From cnakamura@illinois.edu Thu Dec 19 16:10:22 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!illinois!cnakamura
From: cnakamura@illinois.edu (Callum Nakamura)
Newsgroups: comp.sys.m68k
Subject: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Dec19.161022.8186@illinois.edu>
Date: Thu, 19 Dec 1996 16:10:22 GMT
Organization: University of Illinois Urbana-Champaign
NNTP-Posting-Host: illinois.edu
X-Newsreader: NewsWatcher 2.0b24
Lines: 10

Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.

When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization!
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!

-- 
Callum Nakamura -- University of Illinois Urbana-Champaign
"There are 14 nodes and only 10 countries. Count again."

From bramirez@rwth-aachen.de Fri Dec 20 20:57:22 1996
Path: ashpoly!cascade!transat!sunet!nordrelay!rwth-aachen!bramirez
From: bramirez@rwth-aachen.de (Bruno Ramírez)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Dec20.205722.6001@rwth-aachen.de>
Date: Fri, 20 Dec 1996 20:57:22 GMT
References: <1996Dec19.161022.8186@illinois.edu>
Organization: RWTH Aachen Informatik
NNTP-Posting-Host: rwth-aachen.de
X-Newsreader: NewsWatcher 2.0b24
Lines: 9

In article <1996Dec19.161022.8186@illinois.edu>, cnakamura@illinois.edu (Callum Nakamura) writes:
> Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.
> When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization!

Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom.

-- 
Bruno Ramírez
Tape trading list upon request. SASE required for international mail.

From tkarlsson@cam.ac.uk Sun Dec 22 11:41:22 1996
Path: ashpoly!cascade!transat!sunet!nordrelay!cam!tkarlsson
From: tkarlsson@cam.ac.uk (Tomas Karlsson)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Dec22.114122.8385@cam.ac.uk>
Date: Sun, 22 Dec 1996 11:41:22 GMT
References: <1996Dec19.161022.8186@illinois.edu> <1996Dec20.205722.6001@rwth-aachen.de>
Organization: University of Cambridge Computer Laboratory
NNTP-Posting-Host: cam.ac.uk
X-Newsreader: Netscape 1.1N
Lines: 9

In article <1996Dec20.205722.6001@rwth-aachen.de>, bramirez@rwth-aachen.de (Bruno Ramírez) writes:
> Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom.

Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom.

-- 
Tomas Karlsson | tkarlsson@cam.ac.uk
PGP Key fingerprint: 78B6 356E 78D8 B8A4
"Keep the channels open."