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Re: Success story: potato on Sparc Classic

Erik Mouw wrote:
> On Tue, 11 Apr 2000 20:57:53 +0200 (CEST), Eric Delaunay wrote:
> > Phil Brutsche wrote:
> >> It's my understanding that late Sun4c's (IPX and maybe sparctation 2) and
> >> early Sun4m's (like your Classic) will take parity fast page mode 72 pin
> >> 60 ns PC sims, but that PC simms can't be mixed with Sun simms (apparently
> >> Sun simms are 33 bit and PC simms are 36 bit)
> > 
> > It's no problem mixing them.  I've installed 2x 16MB FPM 36 bits and 4x 4MB FPM
> > 33 bits on my SparcClassic.  Just to make sure they are fast page mode, 60ns
> > and 33 or 36 bits (they were not so common in the PC world).
> Is the order of the modules important? I know that other Sparcs want the
> largest modules in the first bank.

I don't really know.  I put both 16MB SIMM modules in the 1st & 4th slots which
are in fact the first bank ;))  I didn't try other place.

> I also found out that a Classic can use 60ns 32bit 8MB modules, although
> it doesn't really like them. The 8MB modules must be in the first bank, and
> the other banks should be empty.

I heard that 8MB & 32MB may work but, as I don't have such modules handy, I
can't try them.  However I tried 1MB 33 bits I got for free but they are not
really useful to extend the memory since the number of banks in the
SparcClassic is rather short ;-)

> The machine correctly detects 16MB, but
> the memory test is very slow. After that it sometimes boots, but crashes
> soon with SCSI DMA errors. Not very useable, though :-(

Are you sure you are using the right type of memory, i.e. fast page mode, 60ns,
36 bits?  Not all non-EDO DRAM are FPM.  There are nibble mode, static row, ...
I don't remember of a very slow memory test.  I can only tell you about the
system I used some time ago, before the 36 bits SIMMs were moved from my
classic to my P90 box.  I need more memory here than in my sparc, so I
downgraded the latter to 24MB only (6x 4MB, 33bits SIMMs) and upgraded the P90
up to 64MB.
Anyway, they used to run with no trouble at all in the past as I compiled many
kernels & Debian packages on my sparc.


 Eric Delaunay                 | S'il n'y a pas de solution, c'est qu'il n'y
 delaunay@lix.polytechnique.fr | a pas de problème.   Devise Shadok.

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