> On 2016-01-29, at 11:37, Michał Pleban <lists@michau.name> wrote: > > Hello! > > silverdr@wfmh.org.pl wrote: > >> Open ended (and possibly also unshielded) wires never do any good to >> signal quality. They are nice antennas, which will add whatever >> electromagnetic smog flies around you to the signal but will also try to >> radiate your signal out. None of these helps. Termination - the drive >> should provide it, similar to what was a standard in SCSI devices. >> Still, I wouldn't bet all of them do. I wouldn't be surprised if some >> were cost reduced because it still worked in basic cases. How to make >> own? Either check the older, still standard compliant implementations or >> maybe checking the original SCSI devices? > > I suppose the Amiga drive which I will be using has some kind of > termination, but right now I just have an open ended cable where I play > with the oscilloscope to learn how the signals are sent to the drive... > > But this gave me an idea - measure the resistance between DISK_RD and > Vcc or GND on the drive, maybe that will give me some idea :-) I have a few SCSI HDDs and SCSI optical drives. In most cases the termination was done using socketed RPs aka RNs (resistor packs aka resistor nets). For mid-cable devices those were to be pulled out of their sockets. I can check those if you like too. -- SD! Message was sent through the cbm-hackers mailing listReceived on 2016-01-29 13:00:11
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