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- Newsgroups: comp.sys.next.hardware
- Path: sparky!uunet!nwnexus!sounds!brianw
- From: BrianW@SoundS.WA.com (Brian Willoughby)
- Subject: Pinout/signal names for the DSP SIMM module connector?
- Message-ID: <C045yn.J4F@sounds.wa.com>
- Sender: brianw@sounds.wa.com (Brian Willoughby)
- Reply-To: BrianW@SoundS.WA.com
- Organization: Sound Consulting, Bellevue, WA, USA
- Date: Thu, 31 Dec 1992 07:54:23 GMT
- Lines: 38
-
-
- Does anyone have the pin-outs for the DSP SIMM module socket in the
- NeXT? I wouldn't want to risk static damage to my CPU by probing around to try
- and find out where the address and data bits are connected if someone already
- has documentation of this.
- I'm tired of reading all of the NeXT literature and dealer spec sheets
- which brag about the capability of the DSP to be expanded to 576 KB (192 KWord)
- when there is in fact no way to purchase such memory expansion for the NeXT
- (NeXT's paltry 96 KB DSP Memory Expansion product, N7013, is really only 32
- KWords, and would be laughable if it weren't for the even smaller amount of RAM
- shipped with the standard NeXT).
- I have e-mailed NeXT directly on several occasions as well as talked on
- the phone to NeXT employees, and I was told that NeXT is too busy handling the
- legal issues of licensing with other companies to take time out to send me this
- information. I don't know why I would need to sign a legal agreement to obtain
- information which any open hardware platform would make freely available,
- especially if said company does not have the time to draw up the legalese.
- The most recent NeXT employee that I corresponded with actually had the
- audacity to suggest that I bother some gentleman down at a California
- university (no, not Stanford) who *was* able to get the information out of
- NeXT. Obviously, this suggestion was not met with much understanding, because
- the gentleman had no motivation to provide support for NeXT Computer.
- Well, back to my question (and off my soapbox):
- I would also find it useful to hear about current limits and timing
- constraints for the signals that are available on this SIMM socket. Any
- signals which are directly connected to the DSP 56001 are clearly documented in
- my Motorola DSP56000 User's Manual, but I would need to know which DSP signals
- are available on which SIMM pins.
- Power supply signals and signals that are buffered inside the NeXT are
- obviously not documented elsewhere, unless someone can tell me which chips NeXT
- uses for buffering (in which case I can obtain my own documentation for the
- specific chips and go from there).
-
- Thanks (I would really appreciate any amount of help in this matter),
- --
- Brian Willoughby Software Design Engineer, BSEE NCSU
- BrianW@SoundS.WA.com Sound Consulting: Software Design and Development
- NeXTmail welcome - NO EMAIL SOLICITATION without prior permission
-