Towers and Racks 257Towers and Racks#5035 Migration Tower I (15 Disk S20/620, 720 System)The #5035 is a converted 620, S20, or 720 (with 15 possible internalCEC disk unit positions) system unit/CEC tower and any existing #5064or #9364 expansion unit, used for migration of existing PCI/SPD cards,existing disk units and existing removable media devices, along withany attached PCI/SPD towers. Additional “pre-V4R5” features may beordered to use vacant card/device slots in the converted CEC andexpansion unit and in any attached PCI/SPD tower. “V4R5 only” featurecards and internal devices are not allowed in the converted CEC tower,the expansion unit, or any of the attached PCI/SPD towers.This feature is primarily for migration upgrade purposes. It can beordered in special circumstances separately as RPQ 847120. See the redbookAS/400e toiSeries 400 Migration , SG24-6055, for a further description.#5034/#5035 MigrationTower I