Re: Toshiba 2.1G in 755

[Tim Tyhurst <tim@excelsior.com>]

> >the caddy connector to prevent the ThinkPad from erroneously
> >jumpering the device to be a slave. Of course, this won't work
> >if the drive is supposed to be a slave (presumably whenever the
> >drive is in a docking station?) but it works for me right now, anyway.

> I checked on the IBM web site for the DCRA22160 drive info 
> 
> (http://eagle.almaden.ibm.com/storage/techsup/hddtech/dcra/dcrajum.htm)
> 
> and found that, depending on the jumpers of pins IBM identifies as 47, 48,
> 49 and 50 (but what I have seen as pins 1, 2, 3 and 4 on another drive), the
> 22160 can be either master, slave, or set by cable connect through Pin 28.

Yes, this is where I've been getting my information, too (although I was
using the www.storage.ibm.com address).

> It seems that, according to what you have done, you want NO CONNECTIONS
> between pins 48 and 50 (or 2 and 4 by my reckoning) to make the drive a
> Master. If those pins are not independently jumperable, but instead are
> brought out through the caddy cable, they have to be controlled at the caddy
> connection in the laptop bay.
>
> If I read your message right, the caddy connections inside the notebook are
> preset to jumper pins 48 to 50 on the drive because of some weirdness of
> IBM's making (incompatible use of those pins from old drives to new drives).
> You must have traced the caddy cable to find the correspondence between
> drive pins 48 and 50 to the corresponding caddy pins (?? and ?? -- can you
> tell us which pins these are?). Then you put tape on those caddy pins to
> disable the "motherboard" jumper?

Pretty much, except that I don't want any pins shorted between
pins 47, 48, 49 and 50.

My theory is that the Thinkpad either short pins 49 and 50 if it wants
the drive to be a master, or leaves it open, if it's to be a slave,
and that they don't use the CSEL signal on pin 28 feature at all.

I have a hunch that the ThinkPad will alter the master/slave settings
(again from the drive bay) depending on the drive startup sequence
specified in EZSetup, but I haven't confirmed this.

Looking into an open drive bay with no drive, pins 47, 48, 49 and 50 are
on the extreme right hand side, with 49 and 50 being on the extreme right.
I don't know which is 49 or 50, though, since my theory doesn't require
this level of detail :-)

--
Tim Tyhurst                  tim@excelsior.com