From mpopov@unam.mx Sat Jun 03 02:41:15 1995
Path: ashpoly!cascade!brgate!saturno!unam!mpopov
From: mpopov@unam.mx (Mike Popov)
Newsgroups: comp.sys.m68k
Subject: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jun03.024115.2968@unam.mx>
Date: Sat, 03 Jun 1995 02:41:15 GMT
Organization: Universidad Nacional Autónoma de México (DGSCA)
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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.

Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week.

-- 
=== Mike Popov ===
Dept of Electrical Engineering, Universidad Nacional Autónoma de México (DGSCA)
"The carrier frequency does not drift by accident."

From msouza@pacbell.net Sat Jun 03 08:06:15 1995
Path: ashpoly!cascade!bigsur!pacbell!msouza
From: msouza@pacbell.net (Mathieu Souza)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jun03.080615.3518@pacbell.net>
Date: Sat, 03 Jun 1995 08:06:15 GMT
References: <1995Jun03.024115.2968@unam.mx>
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In article <1995Jun03.024115.2968@unam.mx>, mpopov@unam.mx (Mike Popov) writes:
> 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!

PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985.

-- 
Mathieu Souza
Tape trading list upon request. SASE required for international mail.

From akarlsson@berkeley.edu Mon Jun 05 12:05:15 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!berkeley!akarlsson
From: akarlsson@berkeley.edu (Andrei Karlsson)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jun05.120515.7441@berkeley.edu>
Date: Mon, 05 Jun 1995 12:05:15 GMT
References: <1995Jun03.024115.2968@unam.mx>
Organization: UC Berkeley Department of EECS
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In article <1995Jun03.024115.2968@unam.mx>, mpopov@unam.mx (Mike Popov) 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.

-- 
=== Andrei Karlsson ===
Dept of Electrical Engineering, UC Berkeley Department of EECS
"The hatch is open. Is anyone listening?"

From hkang@purdue.edu Wed Jun 07 13:45:15 1995
Path: ashpoly!cascade!mxgate!coyoacan!purdue!hkang
From: hkang@purdue.edu (Hugo Kang)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jun07.134515.8666@purdue.edu>
Date: Wed, 07 Jun 1995 13:45:15 GMT
References: <1995Jun03.024115.2968@unam.mx> <1995Jun05.120515.7441@berkeley.edu>
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In article <1995Jun05.120515.7441@berkeley.edu>, akarlsson@berkeley.edu (Andrei Karlsson) writes:
> Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window.

Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet.

Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs.

-- 
Hugo Kang | hkang@purdue.edu
PGP Key fingerprint: EFFB 35F0 E25F D860
"Keep the channels open."

From khernandez@cmu.edu Fri Jun 09 05:28:15 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!cmu!khernandez
From: khernandez@cmu.edu (Kirsty Hernández)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jun09.052815.3760@cmu.edu>
Date: Fri, 09 Jun 1995 05:28:15 GMT
References: <1995Jun03.024115.2968@unam.mx> <1995Jun05.120515.7441@berkeley.edu> <1995Jun07.134515.8666@purdue.edu>
Organization: Carnegie Mellon University School of CS
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In article <1995Jun07.134515.8666@purdue.edu>, hkang@purdue.edu (Hugo Kang) writes:
> Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet.

Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window.

-- 
=== Kirsty Hernández ===
Dept of Electrical Engineering, Carnegie Mellon University School of CS
"Marcus is not one man."