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IDE drives had two jumpers to set master vs slave, SCSI drives had four jumpers or dip switches to configure the bus id... And having to terminate the bus was k

• dspillett 5y ago
  > IDE drives had two jumpers to set master vs slave Or in some cases one to choose between to the two. > but didn't late era PATA also have auto configure for master/slave?) That was “cable select”, enabled with either an extra jumper or (common if the were separate master and slave jumpers) by jumpering for neither master or slave. Here one of the ground pins was not connected in the far end connector on the cable so a drive could decide what it was by inspecting the properties of that line. You could make a CS compatible cable by cutting that line on a non-CS cable. I remember this being around at least as early as 1999, and drives coming set to CS by default at least once 80-conductor cables were common, though I also remember never really trusting it and explicitly setting Master/Slave as I wanted - setting one or two jumpers was no hardship (the vast majority of drives had a little jumper diagram on the printed label so you didn't have to look up the magic anywhere), and you had a touch more cabling freedom (you didn't have to care which connector master was plugged into, it was master irrespective) which was a small mercy with wide ribbon cables.
• garaetjjte 5y ago
  It wasn't so straightforward in the early days of IDE: https://www.os2museum.com/wp/the-dual-drive-ide-hell/ https://www.os2museum.com/wp/the-dual-drive-ide-hell/