Roman numeral to Arabic numeral converter and vice versa help

Settings Remark
Use lowercase letters for thousands If this option is checked, then multiplication by 1000 represented by I, V, X, L, C, M, can be entered by using lowercase letters:
i, v, x, l, c, d, m

If this option is not checked, then the M's are wrote out.

If option is enabled: 6000 = vi
If option is disabled: 6000 = MMMMMM