Since each reference card has its own revision, it doesn't make sense to call a release "revision". This is the 4th release, and it contains a mix of sheet revisions.

Sheet revisions in this release are listed below, one numbered sheet per entry.

1. rev 2
2. rev 3
3. rev 3
4. rev 3
5. rev 2
6. rev 3
7. rev 2
8. rev 2
9. rev 3
10. rev 3
11. rev 3
12. rev 3
13. rev 4
14. (unnumbered bonus sheet) rev 0

Index pages i through viii are "fossil revision", without a revision mark.

Changes:

1. All active-low input and output pins have an inversion circle. Previously only some pins had the inversion circle. Pages affected: 4, 6, 9, 10, 11, 12, 13
2. Fixed CD40110 LE pin/signal logic. It is now correctly marked active-low. Page 13.
3. Fixed CD4511 LE pin/signal logic. It is now correctly marked active-low. Page 10.
4. Fixed CD4543 LE pin/signal logic. It is now correctly marked active-high. Page 10.
5. Added legend for the meaning of LE signals on page 10.