IBM Corp has been doing its sums, calculating the likely cost of Intel Corp Pentium Pro systems by working through the cost of each of the components. Donald Friedman, director of strategy at IBM’s server group, reckons that a four-way P6 system will cost at least $100,000, the main cost drivers being the hard disks and memory. His feeling is that the P6 is not as fast and not as near, as we thought. Friedman also claimed that IBM has persuaded up to 250 Unix independent software vendors to migrate to the planned OS/390 version of Open MVS and he said the number is growing.