johnh@psychvax.psych.su.oz (John Holden) (09/20/90)
I have an early model Vax 3500 with Rev 3 Microcode and Rev 18 fireware. It appears that if I wish to upgrade Ultrix to version 3 or greater, I am required to upgrade my CPU revision level as well at a cost of $15000. Does anybody know what the changes were and if the CPU upgrade is essential for reliable operation. John Holden