Epson ActionTower 3000 Computer - Manuel (Page 64)

Installing External Cache
You can install 64KB, 128KB, or 256KB of external cache on
your system.
To install 64KB of external cache, use eight SRAM, 28-pin,
8K x 8,20ns DIP chips, and one 8K x 8,201ns tag chip
To install 128KB of external cache, use four SRAM, 28-pin,
32K x 8,20ns DIP chips, and one 8K x 8,20ns tag chip
To install 256KB of external cache, use eight SRAM, 28-pin,
32K x 8,20ns DIP chips, and one 32K x 8,20ns tag chip.
The table below lists the cache SRAM DIP chips that are
approved for use in your computer.
Cache SRAM DIP chip types
Manufacturer Part number
Manufacturer
Part number
UMC (8K x 8) UMC164K-20
Cypress (8K x 8) CY78165-15
Toshiba (32K x 8) TC5532K-20
UMC (32K x 8) UM61256AK-15/20
samsung (32K x 8) KM68257BP-15/20
Paradigm (32K x 8) PDM1256S-20
Micron (32K x 8) MT502568-20
NKK (32K x 8) N341256P-20
Winbond (32K x 8) W24257AK-15 I Aster (tag) AA88128AK-20
For the cache memory to work properly, you must install chips
in the following configuration (each bank contains four cache
memory sockets):
Cache memory configurations
Bank 0 Bank1 Tag SRAM
U23 - U26 U30 - U33 U34 Total cache
8Kx8 8Kx8 8Kx8 64KB
32Kx8
-
8Kx8 128KB
32Kx8 32Kx8 32Kx8 256KB
Installing and Removing options 3-21