From rweber@uni-hamburg.de Fri Dec 15 03:43:54 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!uni-hamburg!rweber From: rweber@uni-hamburg.de (Rodrigo Weber) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec15.034354.3604@uni-hamburg.de> Date: Fri, 15 Dec 1995 03:43:54 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N Lines: 10 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! The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Rodrigo Weber -- Universität Hamburg Fachbereich Informatik "Row 14. No joke." From dnovak@purdue.edu Sun Dec 17 03:10:54 1995 Path: ashpoly!cascade!brgate!saturno!purdue!dnovak From: dnovak@purdue.edu (Dong-hyun Novak) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec17.031054.8833@purdue.edu> Date: Sun, 17 Dec 1995 03:10:54 GMT References: <1995Dec15.034354.3604@uni-hamburg.de> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Dec15.034354.3604@uni-hamburg.de>, rweber@uni-hamburg.de (Rodrigo Weber) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Dong-hyun Novak "They will send a copy in my place." Atari TT030 / SunOS 4.1.4 From kpopov@u-tokyo.ac.jp Tue Dec 19 02:10:54 1995 Path: ashpoly!cascade!bigsur!u-tokyo!kpopov From: kpopov@u-tokyo.ac.jp (Katrin Popov) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec19.021054.7064@u-tokyo.ac.jp> Date: Tue, 19 Dec 1995 02:10:54 GMT References: <1995Dec15.034354.3604@uni-hamburg.de> <1995Dec17.031054.8833@purdue.edu> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Dec17.031054.8833@purdue.edu>, dnovak@purdue.edu (Dong-hyun Novak) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. PGP Public key available via finger or upon request. -- Katrin Popov *PLONK* filter active for trolls. 486DX4/100 (FreeBSD 2.0.5) - NetBSD 1.0