That really looks like it won't fit in a 100!
EDIT: 5/30/08
So, I just tried a 6MB card from a 170 and this particular card is just a little too thick to fit comfortably under the 100's keyboard on top of the daughter-board. However, I think with some judicious engineering that solution could have worked to make all the cards compatible throughout the 100 series. All that is really needed is an extra tall connector extension for the RAM card. If I can find one, I may see if I can get this to work, by using spacers under the keyboard to raise it the marginal height necessary.