[ltp] eee pc and thinkpad x40 comparison: a couple of questions

[Paul Fox]

eric wrote:
 > On Sat, Mar 01, 2008 at 12:58:50PM -0500, Paul Fox wrote:
 > > note that there is a set of cheap adapters out there labeled as DMA
 > > which are _not_.  this is the one.  note the attractive price. ($4.99)
 > >   http://www.geeks.com/details.asp?invtid=SY-ADIDE2CF-B1&cpc=SCH
 > > (i found out the hard way.  i was able to add wires to enable
 > > DMA, but it required equipment at work -- i couldn't have done it
 > > with my home soldering iron, or without a magnifier.)
 > 
 > Could you post some detailed instructions on how you did that, that
 > others could follow?

basically it's adding two wires -- the dmarq and dmack lines --
between the CF connector and the IDE connector.  these lines used
to be defined with another, apparently unused, purpose on CF, and
aren't on all pinouts.  on my board(s)
(i had two of them) on the CF end (i think) one of the connector
pins needed to be lifted before connecting it to the other side,
because it was an input, tied high.  other boards may need to do
that as well, and, indeed, might need to have other pins lifted.

the CF pins are 43 and 44.  44 is the one i needed to lift.
    http://pinouts.ru/Memory/CompactFlash_pinout.shtml
(read the text belowe the table for those pin definitions.)

the IDE pins are 21 and 29.
    http://pinouts.ru/HD/AtaInternal_pinout.shtml

connect CF43  --> IDE21 (DMARQ)
connect CF44 <--  IDE29 (DMACK)

paul
=---------------------
 paul fox, pgf@foxharp.boston.ma.us (arlington, ma, where it's 30.7 degrees)