diff --git a/doc/versions.md b/doc/versions.md
index b904a794..1bdaeaec 100644
--- a/doc/versions.md
+++ b/doc/versions.md
@@ -1,7 +1,9 @@
 | Year | Versions | Comment
 | --- | --- | ---
 | 1966 |1? | PDP-6
-| 1968? | |  KA10 support
+| 1968 | 350
+| 1969 | 530 | KA10 support?
+| 1970? | | Virtual memory
 | 1971 | 672-703 | Arpanet support
 | 1972 | 720-724
 | 1973 | 785-850