[ltp] Re: IBM HDAPS Someone interested?

[Alejandro Bonilla]

Alejandro Bonilla wrote:

> Pavel Machek wrote:
>
>> Hi!
>>
>> Apple connects their accelerometer over i2c, see:
>>
>> http://www.kernelthread.com/software/ams/
>>
>> For some reverse engineering attempts, see:
>>
>> http://www.paul.sladen.org/thinkpad-r31/accelerometer.html
>>
>> According to IBM, it is *not* enabled during system bootup:
>>
>> http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-53167 
>>
>>
>> According to another text, BIOS know how to test accelerometer in some
>> kind of self test. Aha, here's the most interesting text:
>>
>> http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-53432 
>>
>>
>> According to this text:
>>
>> typical free-fall takes 300msec, but head unloading takes
>> 300-500msec. [So I had my computation right ;-)] ... "therefore, it is
>> too late to start head unloading after detecting free fall"...
>>
>> They really try to detect conditions just before free fall... and it
>> does not sound that difficult.
>>
>> Another clever trick is that if user is still using the mouse, machine
>> is probably not in free fall ;-). In pdf, they also mention few
>> .sys files. They should probably be disassembled to learn how the
>> interface works (hint hint), actually exported symbol names should be
>> quite helpfull in determining what function is the interesting one.
>>                                 Pavel
>>  
>>
Boris,

    Do you know anything about the HD APS? Is it linked to the embedded 
controller?

.Alejandro