HP49-50G: MLSV OK for -1E-495, not OK for -1E-496, ROOT OK for both

[Gil]

I don't think that the built-in MSLV solver (multi solver for several variables and equation ) of the HP50G calculator uses the Newton's algorithm.

For complex numbers, we must use it instead of the ROOT command reserved for a real unknown.

What is strange is that both methods find the appropriate solution for negative numbers very close to zero,
ie up to -1E-495.

For negative numbers still nearer to zero,
for instance -1E-496, only the command ROOT gives an answer.

I wished to know the reason — in a word, what is so particular with -1E-496 in comparison to -1E-495.