WARNING: This information is provided "as is" with no warranty. Use at your own risk!
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PB410/420 Cache Upgrade

Warning Only authorized service personnel should upgrade the system. Anyone who wants to upgrade the system herself/himself should know about the dangers of ESD (Electro-Static Discharge) and the necessary precautions. Unknowingly zapping the components of the computer will void the warranty.
 

Cache Specifications

1. The PB410 uses the same cache chips as the PB430.
 
2. Cache chips received from end user Service may be marked with a "256." These chips will still work as ordered, that is, 32kx8 or 8kx8; the marking does not necessarily determine the cache amount
 
3. The chips may be 25ns, 20ns, or 15ns while the Tag SRAM can be either 20ns or 15ns. Component Locations The Cache and TAG RAM are either 28-pin for 32KB or 128KB of cache, or 32-pin for 512KB of cache.
 

Purchase Referrals

End users should contact end user Service for cache modules.  
The part numbers are as follows 
 
B257 32k Cache 
B258 : 128k Cache


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