Doug, I haven't seen a 244 for quite a while so I really don't know but I would guess that most of the logic IC's will be missing their part numbers.
Someday I would sure like to see a timeline or history that covers the 244, 245, and 246. I always think of the 250 as "the first digital reverb" but maybe these models came first? The lower model numbers suggest that, but on the other hand they were all rack mount, so maybe they were more advanced, smaller package units that actually came later. Also, aren't all 3 reverb only? The 250 and 251 have other programs, most of which are silly and never used. People only use the reverb programs, and maybe delay.
Also, I wonder how the 244, 245, and 246 reverb algos sound, compared to the 250 and 251.