From nhughes@delphi.com Fri Mar 22 22:43:32 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!delphi!nhughes From: nhughes@delphi.com (Nadia Hughes) Newsgroups: comp.sys.m68k Subject: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Mar22.224332.8181@delphi.com> Date: Fri, 22 Mar 1996 22:43:32 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Nadia Hughes | nhughes@delphi.com PGP Key fingerprint: 4641 15DC 4946 E019 "Keep the channels open." From mlee@pipeline.com Sat Mar 23 04:13:32 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!pipeline!mlee From: mlee@pipeline.com (Mikhail Lee) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Mar23.041332.5234@pipeline.com> Date: Sat, 23 Mar 1996 04:13:32 GMT References: <1996Mar22.224332.8181@delphi.com> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Mar22.224332.8181@delphi.com>, nhughes@delphi.com (Nadia Hughes) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Mikhail Lee *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0 From kstewart@clari.net Sat Mar 23 19:04:32 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!clari!kstewart From: kstewart@clari.net (Kenji Stewart) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Mar23.190432.4039@clari.net> Date: Sat, 23 Mar 1996 19:04:32 GMT References: <1996Mar22.224332.8181@delphi.com> <1996Mar23.041332.5234@pipeline.com> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996Mar23.041332.5234@pipeline.com>, mlee@pipeline.com (Mikhail Lee) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Kenji Stewart -- ClariNet Communications Corp "Marcus is not one man." From bcampbell@mit.edu Sat Mar 23 20:39:32 1996 Path: ashpoly!cascade!brgate!saturno!mit!bcampbell From: bcampbell@mit.edu (Brian Campbell) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Mar23.203932.5913@mit.edu> Date: Sat, 23 Mar 1996 20:39:32 GMT References: <1996Mar22.224332.8181@delphi.com> <1996Mar23.041332.5234@pipeline.com> <1996Mar23.190432.4039@clari.net> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Mar23.190432.4039@clari.net>, kstewart@clari.net (Kenji Stewart) 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. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. If you are posting from AOL, please read RFC 1036 before posting again. -- Brian Campbell Tape trading list upon request. SASE required for international mail. From mokonkwo@delphi.com Mon Mar 25 19:11:32 1996 Path: ashpoly!cascade!mxgate!coyoacan!delphi!mokonkwo From: mokonkwo@delphi.com (Matthias Okonkwo) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Mar25.191132.5566@delphi.com> Date: Mon, 25 Mar 1996 19:11:32 GMT References: <1996Mar22.224332.8181@delphi.com> <1996Mar23.041332.5234@pipeline.com> <1996Mar23.190432.4039@clari.net> <1996Mar23.203932.5913@mit.edu> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1996Mar23.203932.5913@mit.edu>, bcampbell@mit.edu (Brian Campbell) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- === Matthias Okonkwo === Dept of Electrical Engineering, Delphi Internet Services "The carrier frequency does not drift by accident."