Developer Forum

I've tried reading this newsgroup, but I'm still having a hard time
figuring this out: is UltraSCSI, that has a bus speed of 40 MBytes per
second, the same thing as Ultra Wide SCSI?

I have a Sun 420r and the manual for it says that the external SCSI
port is UltraSCSI and has 68 pins.

From doing a google search, it seems that the "wide" was added because
the narrow UltrSCSI bus supported 8 bits and 20 MBytes/sec, is this
correct?

thanks.

Yes, ultra uses an 8 data wires/signals and 50 pin connectors and cables.
Ultrawide uses a 16 data wires/signals and 68 pin connectors and cables.
Both clock at 20 MHz.


So they go it a little wrong as the external is UltraWide since it's 68pins.

Clueless.

UltraSCSI or by it's original name Fast-20 (i.e. 20MHz) comes in both narrow and wide.






So it is UltraSCSI and it is wide at 68 pins. Nothing wrong with it.