This might have been before uLisp (definitely prior to my knowledge of uLisp), and they wanted to write the interpreter for it themselves. IIRC it had 16k of RAM, so it definitely could have run uLisp.
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I should also point out that just storing the names of all of the symbols in the common lisp specification exceeds the RAM requirements of uLisp. Obviously builtins can go in ROM, but it gives you an idea of the sizes involved.
[edit]
I should also point out that just storing the names of all of the symbols in the common lisp specification exceeds the RAM requirements of uLisp. Obviously builtins can go in ROM, but it gives you an idea of the sizes involved.