From nivanov@cmu.edu Sun Jun 18 23:39:52 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!cmu!nivanov From: nivanov@cmu.edu (Nadia Ivanov) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun18.233952.3784@cmu.edu> Date: Sun, 18 Jun 1995 23:39:52 GMT Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 11 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. 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! -- Nadia Ivanov SupraFAXModem 28.8 @ 19,200 bps "A soul is not exclusive to biology." From mgonzalez@purdue.edu Mon Jun 19 08:08:52 1995 Path: ashpoly!cascade!bigsur!purdue!mgonzalez From: mgonzalez@purdue.edu (Min-jun González) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun19.080852.6836@purdue.edu> Date: Mon, 19 Jun 1995 08:08:52 GMT References: <1995Jun18.233952.3784@cmu.edu> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jun18.233952.3784@cmu.edu>, nivanov@cmu.edu (Nadia Ivanov) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- === Min-jun González === Dept of Electrical Engineering, Purdue University Engineering Computer Network "Tape doesn't lie at 02:14. Ears do." From mmacdonald@demon.co.uk Tue Jun 20 03:06:52 1995 Path: ashpoly!cascade!mxgate!coyoacan!demon!mmacdonald From: mmacdonald@demon.co.uk (Morag MacDonald) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun20.030652.1847@demon.co.uk> Date: Tue, 20 Jun 1995 03:06:52 GMT References: <1995Jun18.233952.3784@cmu.edu> <1995Jun19.080852.6836@purdue.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jun19.080852.6836@purdue.edu>, mgonzalez@purdue.edu (Min-jun González) 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. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- === Morag MacDonald === Dept of Electrical Engineering, Demon Internet Services UK "In theory there is no difference between theory and practice." From ttakahashi@pacbell.net Wed Jun 21 22:52:52 1995 Path: ashpoly!cascade!bigsur!pacbell!ttakahashi From: ttakahashi@pacbell.net (Tobias Takahashi) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun21.225252.9732@pacbell.net> Date: Wed, 21 Jun 1995 22:52:52 GMT References: <1995Jun18.233952.3784@cmu.edu> <1995Jun19.080852.6836@purdue.edu> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Jun19.080852.6836@purdue.edu>, mgonzalez@purdue.edu (Min-jun González) 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. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Tobias Takahashi Tape trading list upon request. SASE required for international mail.