what does SCSI-1 tp 2 F mean ? first or second scsi bus or what ???
Sorry, typo. Should have been SCSI-2 Fast.
SCSI comes in many flavours. SCSI-1 was the original implementation, used by Apple, in most Macs. Then, eventually, Apple changed to a dual-bus which was SCSI-2 Fast internal and SCSI-1 external. Then there are the SCSI forms offered by 3rd party cards...
Here's a paste of all the SCSI forms:
SCSI-1
8-bit, parallel, 10-MHz, 5MB/sec sustained.SCSI-2 Fast Narrow
8-bit, parallel, 10-MHz, 10MB/sec sustained.SCSI-2 Fast Wide
16-bit, parallel, 10-MHz, 20MB/sec sustained, 15 devices max.SCSI-3 / Wide Ultra SCSI
Essentially SCSI-2 Fast/Wide, but at 20-MHz and 40 MB/sec.SCSI-3 / Fiber Channel
Serial; 127 hot-pluggable devices per bus; 100 MB/sec.
Uses fiber optic cables up to 10km long, or copper wire cabling up to 100m.SCSI-3 / Serial Storage Architecture (SSA)
Fm IBM. No support in Mac world.
127 hot-pluggable devices per bus; 80 MB/sec.SCSI-3 Wide Ultra2
80-MB/sec, 15 devices max.SCSI-3 Wide Ultra3
160 MB/sec, 15 devices max.SCSI-3 / FireWire (aka IEEE 1394; Sony's iLink)
Serial; 63 hot-pluggable devices per bus; 100 Mbps to 3.2 Gbps.
Apple's initial implementations are 400 and 800 Mbps (40 and 80 MB/sec).
Uses thin 9-pin cables, which carry up to 60 watts.HTH, - Dan.
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