From slopez@uu.net Sun Aug 20 22:26:09 1995 Path: ashpoly!cascade!mxgate!coyoacan!uu!slopez From: slopez@uu.net (Seo-yeon López) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Aug20.222609.5468@uu.net> Date: Sun, 20 Aug 1995 22:26:09 GMT Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net 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. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Seo-yeon López SupraFAXModem 28.8 @ ISDN 64k bps "Do not worship the copy." From okuznetsov@uni-hamburg.de Mon Aug 21 21:56:09 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!uni-hamburg!okuznetsov From: okuznetsov@uni-hamburg.de (Olga Kuznetsov) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Aug21.215609.7117@uni-hamburg.de> Date: Mon, 21 Aug 1995 21:56:09 GMT References: <1995Aug20.222609.5468@uu.net> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Aug20.222609.5468@uu.net>, slopez@uu.net (Seo-yeon López) 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. -- Olga Kuznetsov Tape trading list upon request. SASE required for international mail. From rlopez@kth.se Tue Aug 22 15:43:09 1995 Path: ashpoly!cascade!brgate!saturno!kth!rlopez From: rlopez@kth.se (Rodrigo López) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Aug22.154309.5088@kth.se> Date: Tue, 22 Aug 1995 15:43:09 GMT References: <1995Aug20.222609.5468@uu.net> <1995Aug21.215609.7117@uni-hamburg.de> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Aug21.215609.7117@uni-hamburg.de>, okuznetsov@uni-hamburg.de (Olga Kuznetsov) writes: > PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- === Rodrigo López === Dept of Electrical Engineering, Royal Institute of Technology, Stockholm "Marcus is not one man."