I am pretty sure that the problem was the 24-bit memory addressing...that you can turn on or off in the Memory Control Panel. I remember (and now I am 40, memory is getting dicey) turning that on and off allowed me to recognize more memory.
I got an Apple IIe card from a list pretty cheap...my biggest problem is, I use the Dvorak keyboard layout, which the Apple IIe card won't recognize.
I figured out a solution I have yet to try...I have an AlphaSmart Pro that will let you type in Dvorak as a keyboard, and the computer will recognize it correctly. I'm starting to get off topic.
LC's are great, it was just they were slow, and had a slow data bus...but they were great consumer computers!