Datasheet revision history for at89c5132, 1 changes from 4173a-08/02 to 4173b-03/04, 2 changes from 4173b-03/04 - 4173c - 07/04 – Atmel AT89C5132 User Manual
Page 37: 3 changes from 4173c-07/04 - 4173d - 01/05, 4 changes from to 4317d - 01/05 to 4173e - 09/07