Owner`s manual

DRAFT
As Figure 1–2 shows, three factors affect the customer’s choice between the
two ways of upgrading a VAX 6000 system that does not have +3.3V power.
1
Need for Battery Backup
The H7231-N battery backup unit (used with the VAX 6000 systems
without +3.3V) is incompatible with the KA66A processor. An H7236-
A battery backup unit is required, and its installation entails the full
power and packaging upgrade (the H9657-CU kit).
2
Need for More Than Four CPUs
The H9657-CX kit generates enough +3.3V power to run four KA66A
CPUs. If you need more than four CPUs, you must perform the full
power and packaging upgrade, where you install the H7242 power
regulator.
3
Need for More Than 12 XMI Slots
The H9657-CX power regulator module requires two XMI slots, leaving
12 slots for processors, memories, and adapters. If you need more than
12 slots, you must install the full power and packaging upgrade.
If the customer does not need the three items mentioned, option
4
,
installing the H9657-CX kit, is probably the best choice. If the customer
needs any of the three items, option
5
, installing the H9657-CU kit, is
needed. This upgrade is described in detail in the VAX 6000 XMI Conversion
Manual.
NOTE: If the customer is upgrading from a Model 500 that was itself
upgraded using the H9657-CX kit, the same restrictions listed above apply.
That is, such a system can have no battery backup, can have no more than
four CPUs, and can use no more than 12 XMI slots.
Introduction 1–5