From pchoi@mindspring.com Sat Sep 07 06:29:04 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!mindspring!pchoi From: pchoi@mindspring.com (Pavel Choi) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep07.062904.9980@mindspring.com> Date: Sat, 07 Sep 1996 06:29:04 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. 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. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Pavel Choi SupraFAXModem 28.8 @ 14,400 bps "Marcus is not one man." From fstewart@hanse.de Mon Sep 09 01:36:04 1996 Path: ashpoly!cascade!brgate!saturno!hanse!fstewart From: fstewart@hanse.de (Freya Stewart) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep09.013604.9709@hanse.de> Date: Mon, 09 Sep 1996 01:36:04 GMT References: <1996Sep07.062904.9980@mindspring.com> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: Netscape 1.1N Lines: 12 In article <1996Sep07.062904.9980@mindspring.com>, pchoi@mindspring.com (Pavel Choi) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > 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. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. If you are posting from AOL, please read RFC 1036 before posting again. -- Freya Stewart *PLONK* filter active for trolls. Sun 3/60 (SunOS 4.1.1) - NetBSD 1.0 From ggonzalez@titech.ac.jp Mon Sep 09 14:18:04 1996 Path: ashpoly!cascade!transat!ukc!fennimore!titech!ggonzalez From: ggonzalez@titech.ac.jp (Göran González) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep09.141804.2825@titech.ac.jp> Date: Mon, 09 Sep 1996 14:18:04 GMT References: <1996Sep07.062904.9980@mindspring.com> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996Sep07.062904.9980@mindspring.com>, pchoi@mindspring.com (Pavel Choi) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Göran González Tape trading list upon request. SASE required for international mail.