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Posted 31 December 2007 - 11:02 AM
Posted 31 December 2007 - 12:28 PM
Posted 31 December 2007 - 12:45 PM
Posted 31 December 2007 - 05:15 PM
Posted 31 December 2007 - 06:35 PM
Edited by Eyesee, 31 December 2007 - 06:39 PM.
Posted 01 January 2008 - 09:01 AM
Posted 01 January 2008 - 09:15 AM
Copyright 2007 by Morris Rosenthal
The 40 wire IDE ribbon cable may be keyed to the connector on the CD burner,
The first connection to make when you install a CD drive (because it's at the bottom and hardest to get at) is the audio lead for playing music CDs
Posted 01 January 2008 - 09:28 AM
To use cable select, both devices on the channel are set to the "cable select" (CS) setting, usually by a special jumper. Then, a special cable is used. This cable is very similar in most respects to the regular IDE/ATA cable, except for the CSEL signal. CSEL is carried on wire #28 of the standard IDE/ATA cable, and is grounded at the host's connector (the one that attaches to the motherboard or controller). On a cable select cable, one of the connectors (the "master connector") has pin #28 connected through to the cable, but the other (the "slave connector") has an open circuit on that pin (no connection). When both drives on the channel are set cable select, here's what happens:
Master: The device that is attached to the "master connector" sees the CSEL signal as grounded, because its connector has pin #28 attached to the cable, and the host's connector has that signal grounded. Seeing the "zero value" (grounded), the device sets itself to operate as master (device 0).
Slave: The drive that is attached to the "slave connector" does not see the CSEL signal as grounded, because its connector is not attached to the CSEL signal on the cable. Seeing this "no connection", the device configures itself as a slave (device 1).
If you switch the devices between the two connectors, they swap configuration, the master becoming the slave and vice-versa. Not a very complicated arrangement, and a good idea, it would seem. In fact, if cable select had actually caught on, it would have been great. The problem is that it has never been widely used, and this lack of universality has made cable select unattractive, which is a bit of a chicken and egg situation. Since cable select was never accepted in the industry, most drives come, by default, with the drive jumpered as a master or single drive. This means that to enable cable select, you have to change a jumper anyway, which obviously negates some of the advantage.
But the biggest reason why cable select never caught on was the cable itself. From the very beginning, all 40-conductor IDE/ATA cables should have been made so that they would work with cable select. There's actually no need to have different cable types, because if you set a drive to "master" or "slave" explicitly, it just ignores the CSEL setting. So a cable select cable can be used either way: regular jumpering or cable select.
Unfortunately, regular 40-conductor IDE/ATA cables don't support cable select. (Why this came about I do not know, but I suspect that some bean counter determined they could save five cents on each PC by doing this.) So to use cable select you need a special cable, and these are of course non-standard, making them a special purchase. Also, many people don't understand cable select, nor do they realize it needs a special cable. If you set both drives to "CS" and then use them on a regular (non-cable-select) IDE cable, both drives will configure themselves as "master", causing a configuration conflict.
Making matters worse, the 40-conductor IDE/ATA cable select cables have the "master connector" as the middle device and the "slave connector" as the device at the end of the cable, farthest from the host. For signaling reasons, it's best to put a single drive at the end of a cable, not put it in the middle leaving a "stub" of wire hanging off the end of the channel. But if you do this, that single drive sets itself as a slave with no master, a technically illegal configuration. Worse, suppose you do this, and your hard disk sets itself as a slave, and the system boots from it without problem, as most would. Then, you decide to add a new hard disk. You set it to cable select and attach it to the middle connector. The new drive then becomes the master, and thus moves ahead of the old drive in precedence! The system will try to boot from it instead of your old drive (which some people might want, but many do not.)
Edited by DaChew, 01 January 2008 - 09:31 AM.
Posted 01 January 2008 - 07:00 PM
Posted 01 January 2008 - 08:02 PM
Posted 02 January 2008 - 09:12 AM
I would buy a new cable(standard 80 conductor) ultradma, put the superior drive(dvd burner) on top, jumpered master at end of cable.
Preferably disconnect the old drive(it's just a power waste and an accident waiting to happen
If you must use it connect as slave to the lower connector(towards the middle of the cable)
Remember the long section with blue connects to the motherboard
Posted 02 January 2008 - 10:01 AM
Edited by DaChew, 02 January 2008 - 10:10 AM.
Posted 02 January 2008 - 11:44 AM
Posted 02 January 2008 - 12:01 PM
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