Installing External Cache - Epson ActionTower 3000 Computer User Manual

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
UMC (8K x 8)
Cypress (8K x 8)
Toshiba (32K x 8)
UMC (32K x 8)
Winbond (32K x 8)
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
U23 - U26
8Kx8
32Kx8
32Kx8
Manufacturer
Part number
UMC164K-20
CY78165-15
TC5532K-20
UM61256AK-15/20
W24257AK-15
I Aster (tag)
Bank1
U30 - U33
8Kx8
-
32Kx8
Installing and Removing options
Part number
samsung (32K x 8)
Paradigm (32K x 8)
Micron (32K x 8)
NKK (32K x 8)
Tag SRAM
U34
8Kx8
8Kx8
32Kx8
KM68257BP-15/20
PDM1256S-20
MT502568-20
N341256P-20
A A 8 8 1 2 8 A K - 2 0
Total cache
64KB
128KB
256KB
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