Only the 3SG pronoun shows a nominative-accusative distinction (a/hem), the others are neutral.
(Dependent pronouns other than 3SG are ignored here; cf. Feature 17 "Special dependent personal pronouns".)
Source: Schumann 1781: 45
Source: van Dyk ca. 1765: 6
Source: Schumann 1781: 264
Source: Schumann 1783: 182