HP 42S, DM 42 Integral

[Thomas Okken]

The DM42 firmware is basically Free42. The INTEG algorithm in Free42 is similar to that used in the HP-42S, i.e. Romberg integration with non-uniform spacing of sample points, and very similar performance in terms of convergence and accuracy. The one significant difference is that the HP-42S INTEG algorithm is smarter about when to stop the iteration...