Looking for a CF to IDE adapter, to replace an old hard disk in an old computer with a CF card, I have discovered a variety of models: With or without bracket (to instal in the back side of the PC), with male or female connector, with the connector straight at the edge of the card or at a right angle, single or dual, with or without master/slave jumper AND (the subject of my question) with or without a voltage jumper and with or without a 4-pin floppy-like power connector.
What's the story with this jumper and the power connector? The jumper (if exists) let's you select between +5 and +3.3V, but, when does somebody need to select +5 or +3.3? Does it depend on the computer? On the CF card? On what?
And 2nd, some adapters have the inscription "Autoselect power supply (IDE pin 20 or external)". How does this autoselection works with the voltage jumper? Does the jumper select voltage only for IDE pin 20? Only for external? For both? I'm supposing that "external" means the floppy power connector, but I'm not 100% sure.
Also, I have tried one of these with the "autoselect" feature, and without voltage jumper. But on my modern PC it only works if I plug the floppy power connector. So, is this feature one of those things which almost never works? Or is it something which uses to work and I'm just being unlucky?
PS: Sorry if there was a better forum for this, but I think it's neither Vintage Computer Hardware nor Vintage Computer Tools and I couldn't find a better place.
What's the story with this jumper and the power connector? The jumper (if exists) let's you select between +5 and +3.3V, but, when does somebody need to select +5 or +3.3? Does it depend on the computer? On the CF card? On what?
And 2nd, some adapters have the inscription "Autoselect power supply (IDE pin 20 or external)". How does this autoselection works with the voltage jumper? Does the jumper select voltage only for IDE pin 20? Only for external? For both? I'm supposing that "external" means the floppy power connector, but I'm not 100% sure.
Also, I have tried one of these with the "autoselect" feature, and without voltage jumper. But on my modern PC it only works if I plug the floppy power connector. So, is this feature one of those things which almost never works? Or is it something which uses to work and I'm just being unlucky?
PS: Sorry if there was a better forum for this, but I think it's neither Vintage Computer Hardware nor Vintage Computer Tools and I couldn't find a better place.