NCR Corp, Sequent Computer Systems Inc and Unisys Corp are all planning to see that May 17 – Pentium Day – is not totally dominated by the personal computer end of the business: like just about every other Intel Corp customer, these companies are bursting to talk about their high-end Pentium systems, but have been forcibly gagged by Intel from doing so: NCR was luckier than most in that it got a ten minute portion of the huge Intel presentation at Cebit in Hannover last month devoted to its eight- processor Pentium monster, but with the model number carefully removed.