Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!uakari.primate.wisc.edu!caen!news.cs.indiana.edu!noose.ecn.purdue.edu!ecn.purdue.edu!cyliax
From: cyliax@ecn.purdue.edu (Ingo Cyliax)
Newsgroups: comp.sys.next
Subject: Re: Access to sound port from DSP?
Message-ID: <1991Mar25.113606@ecn.purdue.edu>
Date: 24 Mar 91 15:05:06 GMT
References: <1991Mar24.231144.19341@nntp-server.caltech.edu> <38fl02Ef06Hs01@JUTS.ccc.amdahl.com>
Sender: root@noose.ecn.purdue.edu (ECN System Management)
Reply-To: cyliax@ecn.purdue.edu (Ingo Cyliax)
Organization: Purdue University Engineering Computer Network
Lines: 26

After pooring through all the literature on the sound and mic. ports
and the DSP that I can find, I have come to the conclusion that there
is no direct connection from the CODEC and the DAC to the DSP. I think
it's all done with the DMA controller and the host port on the DSP. Is
this correct ?

Also, I haven't found anything  on wether the serial ports from the DSP
are used for anything internal on the NeXT. Is there a diagram or technical
description of the hardware layout of the NeXT DSP, sound system and the
DMA controller ? 

Has anyone thought of using the high speed serial ports from the DSP for
anything besides hooking up CODECs, A/D or DACs ? One could design a serial
port multiplexer or some high speed data channel to some other systems.
ISDN anyone ? What's the max. DMA bandwidth between the DSP and host 
memory ? 

I would love to work on some projects involving the DSP on the NeXT. But
right now I can't justify spending that much time on the NeXT, since I have
other work to do that pays the rent....

Any comments ?

-ingo

/* Ingo Cyliax, Home: (317) 474-0031, E-Mail: pur-ee!flaubert!cyliax */