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#61
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DVD Burner Problem
On Fri, 28 Oct 2005 19:55:35 +0100, patrickp wrote:
On Thu, 27 Oct 2005 18:19:36 -0400, MCheu wrote: The original 40 conductor IDE cables had full connections going to both drive connectors. Those won't work with cable select. The old 40 wire CS cables had a gap in conductor 28, between the two drive connectors. The middle drive thus sees a connection and declares itself master, and the one past the gap sees what looks like a ground, so declares itself slave. That's how cable select works. Yeah, I know, that's backwards from the normal master/slave configuration -- keep reading before you nitpick. Some were wired in a "Y" configuration, with a complete set of connections going to the end drive (thus making it master) and a branch leading to the middle connector. This middle branch had conductor 28 broken, making the middle connector CS slave. This was more in keeping with the traditional drive orientation. Later cables were wired in the "Y" configuration but put the break into the middle connector itself, so there was no external indication that there was any difference between it and a "regular" cable. Since pin28 is dedicated to cable select chores, it doesn't affect manual master/slave configurations. The 80 conductor cables are all supposed to be CS cables wired up in Y configuration as described in that previous paragraph, so the conductor 28 stuff should be invisible. However, it's conceivable that someone could have just given a full connection to both connectors. It wouldn't be the first time that I've seen an IDE cable on the shelf that wasn't 100% conformant in some way (usually it's just something silly like the colour of the connector plastic). Actually, some 80 wire cables are wired with the centre connector as master. I have a couple somwhere. I was always told it was "best" to have the master at the end. No idea why. -- http://www.petersparrots.com http://www.insanevideoclips.com http://www.petersphotos.com Then there was the Eskimo girl who spent the night with her boyfriend and next morning found she was six months pregnant. |
#62
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DVD Burner Problem
The 80 conductor cables are all supposed to be CS cables wired up in Y configuration as described in that previous paragraph, so the conductor 28 stuff should be invisible. However, it's conceivable that someone could have just given a full connection to both connectors. It wouldn't be the first time that I've seen an IDE cable on the shelf that wasn't 100% conformant in some way (usually it's just something silly like the colour of the connector plastic). Actually, some 80 wire cables are wired with the centre connector as master. I have a couple somwhere. I was always told it was "best" to have the master at the end. No idea why. Probably came from the old SCSI days where you needed terminator resistors on the end of the cable chain on some SCSI systems, more so when using very long SCSI cables. On 386s and older, it was usual practice to plug the first drive to the middle plug on the cable, the remaining cable being tucked up out of the way. Dave |
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