robespierre wrote:When you convert a Wide SCSI bus to a narrow device, half the bus lines end at the converter. So really there should be active termination on this high byte and also forcing the bus to use Single-Ended mode. Otherwise there's a risk of spurious signals confusing the devices attached to the Wide side—disks and the host adapter.
When the converter is terminated properly, it's possible to use Ultra-Wide disks between the host and the converter, and narrow disks after it, at the same time. You do have to arrange the SCSI IDs so that they don't conflict (each narrow SCSI ID shadows two wide SCSI IDs, n and n+8). However, connecting any single-ended devices (wide or narrow) forces the bus to single-ended, with a maximum speed of 40 MB/s for the wide side of the bus.
kokoboi wrote:Thank you for your replies.
I'm using aha2940uw. All hdds are IBM ST(2gb,4gb,9.1gb) they have jumpers to enable narrow mode and termination.
The scsi adapter 68 to 50pin is http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&_trksid=p4340.l2557&item=250999665562&nma=true&rt=nc&si=ggGkB3r4D7ZbNkgY%252FYE%252BJeDtJ%252BI%253D&sspagename=STRK%3AMEWNX%3AIT&orig_cvip=true&rt=nc
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