From dtakahashi@kth.se Fri Sep 01 18:43:54 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!kth!dtakahashi
From: dtakahashi@kth.se (Dong-hyun Takahashi)
Newsgroups: comp.sys.m68k
Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Sep01.184354.4576@kth.se>
Date: Fri, 01 Sep 1995 18:43:54 GMT
Organization: Royal Institute of Technology, Stockholm
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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!
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.

Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM?

-- 
Dong-hyun Takahashi
Tape trading list upon request. SASE required for international mail.

From nschneider@cmu.edu Sat Sep 02 20:07:54 1995
Path: ashpoly!cascade!brgate!saturno!cmu!nschneider
From: nschneider@cmu.edu (Natalia Schneider)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Sep02.200754.3705@cmu.edu>
Date: Sat, 02 Sep 1995 20:07:54 GMT
References: <1995Sep01.184354.4576@kth.se>
Organization: Carnegie Mellon University School of CS
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In article <1995Sep01.184354.4576@kth.se>, dtakahashi@kth.se (Dong-hyun Takahashi) writes:
> Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.

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

Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns.

-- 
=== Natalia Schneider ===
Dept of Electrical Engineering, Carnegie Mellon University School of CS
"Do not worship the copy."