From kivanov@mit.edu Sun Sep 24 10:22:44 1995 Path: ashpoly!cascade!mxgate!coyoacan!mit!kivanov From: kivanov@mit.edu (Katrin Ivanov) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep24.102244.5390@mit.edu> Date: Sun, 24 Sep 1995 10:22:44 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: WinVN 0.99.5 Lines: 11 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! -- Katrin Ivanov Opinions expressed are solely my own and not those of Massachusetts Institute of Technology. ------------------------------------------------------------ From rramirez@stanford.edu Tue Sep 26 07:50:44 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!stanford!rramirez From: rramirez@stanford.edu (Raj Ramírez) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep26.075044.2610@stanford.edu> Date: Tue, 26 Sep 1995 07:50:44 GMT References: <1995Sep24.102244.5390@mit.edu> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Sep24.102244.5390@mit.edu>, kivanov@mit.edu (Katrin Ivanov) 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. -- Raj Ramírez *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0