SR-50 vs SR-52/56 Logic

[Gene]

Well it probably was the internal memory shortage that hurt the most. The SR-50 had 1 and the SR-51 had 3 addressable memories. From the initial marketing standpoint, TI probably thought if they **had** any extra available memories that it would be best to give them to the user, not use them internally...plus you have to have parentheses on the keyboard and internal processing to evaluate the deferred algebraic stack... all tough when being designed in early 1974 (9-12 months before being sold for the first time?).

When the SR-52 came out, memory was cheaper. It had 20 (ok 22 when you use STO 98 and STO 99) memories plus the AOS stack.