TH78A.13
 
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PERFORMING THE MODS:
To open the radio  remove the battery,  then remove the 3 #0 phillips screws 
from the back, and the one from the side.   Flip over the radio and press up 
on the inside of the back cover.   Be carefull with the LEDs on top.  On the
front portion of the  radio you'll  find a  circuit  board with a  copper or 
brass shield.   Depending on the version of  the radio the shield may have a 
1/2 oval cutout  on the lower right  side.  The memory  expansion unit  fits 
just to the right of the diodes which are  under the oval cutout.   If there 
is no cutout then you must CAREFULLY remove the shield.
 
I'll attempt to draw the layout (I stress the word attempt).

end of part 4