🚀 go-pugleaf

In article <1992Nov23.225548.16414@ringer.cs.utsa.edu> dan@ennex1.eng.utsa.edu (Daniel Shelton)  
writes:
>In article <1992Nov23.172959.3855@pencom.com> ph@pencom.com (Patrick  
>Hester) writes:
>> Does anyone know about adding DSP memory to a (non-turbo) 68040 cube?
>> I've checked the FAQ but no mention of DSP memory.
>> I'd like to pump up the DSP so I can have lots of synthesis going on at
>> the same time.
>> So if anyone knows how much memory can be added, what kind, where to
>> get it, prices or any other clues, please let me know. Also if you
>> happen to have an idea how extra memory will change the limits...
>
> You can add another 32K of memory, they will say 96K, but the DSP
>memory is 24 bits wide so it is only 32K, to the DSP via a SIMM module
>from NeXT for $195.  Call them at 1-800-848-NeXT for details. Part
>#N7013. 

It will NOT ADD 32kwords of memory -- N7013 will REPLACE the existing
8kwords of DSP RAM with 32kwords on a SIMM.  So you end up with the
total of 32kwords (96kbytes) after installation of N7013, not
40kwords = 8 (existing) + 32 (N7013).  I suppose the 8k on the CPU
board is disabled.


Also, current 3.0 MusicKit from CCRMA will NOT use the expanded DSP RAM
automatically.  It is hardcoded for 8kwords (It has always been for
previous releases).  Therefore, installing N7013 will not automatically
increase synthesis capacity of a NeXT.   I believe you must obtain the
MusicKit sources and change the hardcoded DSP RAM size (8k) and re-make
the kit.  Doc mentions that auto-detection of DSP RAM size is an item
on the to-do list for future, but not yet supported.

It is pretty simple to determine whether a NeXT has 8k or 32k of DSP
RAM at run time, but you need to run a DSP program to do this.
See DSPMemorySize.tar.Z on the archives.

--
Izumi Ohzawa             [ $@Bg_78^=;(J ]
USMail: University of California, 360 Minor Hall, Berkeley, CA 94720
Telephone: (510) 642-6440     Fax:  (510) 642-3323
Internet: izumi@pinoko.berkeley.edu (NeXT Mail OK)