On Wed, Nov 21, 2001 at 12:58:34AM -0800, B. James Phillippe wrote:
> Hello,
> 
> This is a stupid newbie question.  I recently got NetBSD-1.5.2/alpha
> running on a system with a NCR 53c875 and an IBM UltraStar 36G 10k RPM SCSI
> drive connected via 68pin connector.  When the system boots up, I see this
> output (abridged):
> 
> siop0 at pci0 dev 9 function 0: Symbios Logic 53c875 (ultra-wide scsi)
> siop0: using on-board RAM
> siop0: interrupting at eb164 irq 3
> scsibus0 at siop0: 16 targets, 8 luns per target
> ...
> siop0: target 6 using tagged queuing
> sd0 at scsibus0 target 6 lun 0: <IBM, DDYS-T36950N, S96H> SCSI3 0/direct fixed
> siop0: target 6 using 16bit transfers
> siop0: target 6 now synchronous at 20.0Mhz, offset 16
> sd0: 35003 MB, 15110 cyl, 12 head, 395 sec, 512 bytes/sect x 71687340 sectors
> 
> My question is, does this combination support 80MB/sec, or just 40MB/sec?

16bit * 20Mhz = 40MB/s
The 53c875 is a ultra-wide adapter, not ultra2-wide (the 895 is
ultra2-wide)

--
Manuel Bouyer, LIP6, Universite Paris VI.           Manuel.Bouyer@lip6.fr
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