"J.A. Gutierrez" <spd@daphne.cps.unizar.es> writes:

> #1:
> SPARCstation 20 Model 50
> Sun S20,501-2324
> Two SBus SCSI DMA "Generic SCSI" SCSI controllers
> Two "AMD Lance Am7990" 10-Mb Ethernet network interfaces
> GX 8-bit Accelerated Color Graphics [cgsix]
> "TI Model 50 SuperSPARC SPARCmodule" 50 MHz CPU
> Sun SPARCstation 20 (1 X 390Z50)
> socket J0201 has a 16MB SIMM
> socket J0301 has a 16MB SIMM
> empty sockets: J0303 J0202 J0305 J0203 J0302 J0304
> total memory = 32MB

> #2:
> Sun SPARCStation 20
> SuperSPARC 60 MHz
> RAM 32 Mb, single SIMM
> (dead disk right now, so I can't get more information right now)

> Is it possible to

> a) Put the 60 MHz CPU on #1 so both CPU's will work (I guess is safer
> to put the 60 MHz one on the older motherboard than the reverse)
> (according to http://mbus.sunhelp.org/misc/genconf.htm it seems it
> should work)

You should never, ever combine CPU modules of different speed/type. If you
can, obtain another 50 or 60 MHz module and use them in matched pairs of the
same speed/type.

> b) Use all the SIMMs on a single SS20 (16+16+32)

Yes that'll be fine. However, SS20's work best with 32 MB and 64 MB modules
only. Sun's 501-2622 and 501-2480 modules (or 3rd-party equivalents) are
what you should look for.

The newer 128 and 256 MB 200 pin RAM modules while having the exact same
configuration connection-wise are not supported in SS20's.

Regards,

Craig.
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