From dcampbell@tum.de Tue Mar 26 11:14:00 1996 Path: ashpoly!cascade!bigsur!tum!dcampbell From: dcampbell@tum.de (Dong-hyun Campbell) Newsgroups: comp.sys.m68k Subject: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Mar26.111400.1575@tum.de> Date: Tue, 26 Mar 1996 11:14:00 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. 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! Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Dong-hyun Campbell SupraFAXModem 28.8 @ 33,600 bps "The carrier frequency does not drift by accident." From ksokolov@stanford.edu Wed Mar 27 21:59:00 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!stanford!ksokolov From: ksokolov@stanford.edu (Katrin Sokolov) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Mar27.215900.2093@stanford.edu> Date: Wed, 27 Mar 1996 21:59:00 GMT References: <1996Mar26.111400.1575@tum.de> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Mar26.111400.1575@tum.de>, dcampbell@tum.de (Dong-hyun Campbell) 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. -- Katrin Sokolov *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0 From atakahashi@hanse.de Thu Mar 28 18:17:00 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!hanse!atakahashi From: atakahashi@hanse.de (Anja Takahashi) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Mar28.181700.5975@hanse.de> Date: Thu, 28 Mar 1996 18:17:00 GMT References: <1996Mar26.111400.1575@tum.de> <1996Mar27.215900.2093@stanford.edu> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Mar27.215900.2093@stanford.edu>, ksokolov@stanford.edu (Katrin Sokolov) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Anja Takahashi *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From otakahashi@tum.de Sat Mar 30 00:38:00 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!tum!otakahashi From: otakahashi@tum.de (Olga Takahashi) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Mar30.003800.4892@tum.de> Date: Sat, 30 Mar 1996 00:38:00 GMT References: <1996Mar26.111400.1575@tum.de> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Mar26.111400.1575@tum.de>, dcampbell@tum.de (Dong-hyun Campbell) 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. -- Olga Takahashi "In theory there is no difference between theory and practice." 486DX4/100 (FreeBSD 2.0.5) / FreeBSD 2.1