On Sun, 31 Oct 2004 23:08:51 -0500, Triffid <triffid@nebula.net>
wrote:

>
>
>Craig Dewick wrote:
>
>> thefinn <thefinn@tpg.com.au> writes:
>>
>>
>>>How can I add scsi2 or better hard drives to a sparc 20?
>>
>>
>> You can add one internally, but it needs to be a 1" high (ie. low-profile)
>> drive to fit in the bays. You'll also need one of the special plastic
>> mounting frames.
>>
>> The other alternative, if you want internal mounting is make up a way to
>> mount a drive in the CD-ROM drive bay and connect it to the 50-pin CD-ROM
>> data cable using an 80 pin to 50 pin adaptor or 68 to 50 pin adaptor
>> depending whether the target drive has an 80 or 68 pin SCSI interface
>> connector.
>>
>> It's not an ideal method but if you don't have any of the special mounting
>> frames and you can't (or don't) want the drive mounted externally, it's the
>> only other viable option.
>
>Assuming one has mounting frames (or can jury-rig - I made a couple
>using bits of perspex from the surplus store), what's the fastest drive
>an SS20 can actually utilise? I assume anything with an STR over 40Mb/s
>would be wasted, or is it 20Mb/s?

SS20 is limited to 10MB/s on the built in SCSI.

>While I'm here, how much difference do Ross 200Mhz processors make to an
>SS20? Could I expect performance equivalent to a 360Mhz Ultra 5 if I
>installed two? Four? Any reason to prefer the twin processor boards over
>singles, aside from the twins consuming an SBUS slot?

This might be helpful:

http://mbus.sunhelp.org/modules/index.htm

Personally I think that the 200MHz Ross modules are overpriced. There
have been some on Ebay recently with a price tag of $500.00 for a pair
of dual 200MHz/512KB modules. For that price you can get a reasonably
equipped Ultra system.

Josh