| Release | Version name | Release date |
|---|---|---|
| 1 | Version 1.0 | December 1982 |
| 2 | Version 1.2 | April 1983 |
| 3 | Version 1.3 | August 1983 |
| 4 | Version 1.4 | October 1983 |
| 5 | Version 2.0 | October 1984 |
| 6 | Version 2.1 | May 1985 |
| 7 | Version 2.5 | June 1986 |
| 8 | Version 2.6 | April 1987 |
| 9 | Release 9 | September 1987 |
| 10 | Release 10 | October 1988 |
| 11 | Release 11 | October 1990 |
| 12 | Release 12 | June 1992 |