| Version | Build | Release Date |
|---|---|---|
| 6.0 | ? | April 1988 (1988-04) |
| 6.0.1 | ? | 19 September 1988 (1988-09-19) |
| 6.0.2 | ? | |
| 6.0.3 | ? | 23 December 1988 (1988-12-23) |
| 6.0.4 | ? | 20 September 1989 (1989-09-20) |
| 6.0.5 | ? | 19 March 1990 (1990-03-19) |
| 6.0.6 | ? | |
| 6.0.7 | ? | 15 October 1990 (1990-10-15) |
| 6.0.8 | ? | 13 May 1991 (1991-05-13) |
| 6.0.8L | ? | 23 March 1992 (1992-03-23) |