SR-52 and subroutine levels.

[Steve Simpkin]

(05-28-2022 01:45 AM)pauln Wrote:  Intuitively, 4 subroutine levels seem enough for 224 steps.

In comparison, the HP-67 has only 3 subroutine levels: https://www.hpmuseum.org/prog/hp67prog.htm

The TI-59 has 6 subroutine levels but it needs to deal with a much bigger addressing space (up to 100K steps, counting the module).

Yes a number of HP calculators also have 6 subroutine levels including the HP-34C and HP-41C. The HP-42S has 8 subroutine levels. The HP-32SII and HP 33s have 7 subroutine levels. The HP 35s has a whopping 20 subroutine levels!