PB640 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.
End user units include a special CELP socket for an upgradeable COAST Cache module.The CELP (Card Edge Low Profile) upgrade option conforms to Intel specification #1.2 for COAST (Cache On A stick) cache modules. The CELP connector supports 256k COAST modules using asynchronous, or burst and pipelined burst srams. Burst and Pipelined Burst srams must meet the functional and electrical specifications documented in Intel's Pentium Processor Burst SRAM Specification booklet, revision 1.0.COAST Modules Supported

There are two COAST module configurations supported:
1. Modules configured with 32k x 64 asynchronous SRAM with a 5v 8k x 8 SRAM Tag SRAM. Eight 32k x 8 3.3v srams are used for the Data rams (all are contained on the COAST module).
2. Modules configured with 32k x 64 burst or pipelined burst with either four 32k x 16 or two 32k x 32 (no parity) srams (also located on the COAST module).Commercial units have 256KB of Cache soldered on board which is not upgradeable.