Appendix A - Upgrading Cache Memory
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Appendix A
Appendix A
Upgrading to 128 KB Cache Memory
Upgrading to 128 KB Cache Memory
To upgrade to 128 KB cache memory, use four 32 KB x 4 static RAM chips. These four SRAMs can be installed in either SRAM bank.
The following table lists SRAM manufacturer and part numbers.
Cache
Size
Numbe
r of
SRAMs
Board
Speed
SRAM
Speed
SRAM
Type
Manufacturer
Part Number
64 KB
Eight
25 MHz
20 ns
8 KB x 8
Cypress®
CY7C185-20PC
128 KB
Four
25 MHz
20 ns
32 KB x 4
Motorola®
MCM6206NP2
0
64 KB
Eight
33 MHz
15 ns
8 KB x 8
128 KB
Four
33 MHz
15 ns
32 KB x 4
U p g r a d e S R A M I n s t a l l a t i o n P r o c e d u r e
U p g r a d e S R A M I n s t a l l a t i o n P r o c e d u r e
Step
Action
1
Remove the eight 8 KB x 8 SRAM chips. See the graphic on the
following page to pinpoint the location. The socket designators are
U3, U4, U9, U10, U11, U12, U15, and U16.
2
Remove the shorting bridge on J100.
3
Insert four 32 KB x 8 SRAM chips in the four empty SRAM sockets
nearest the Coprocessor socket. Make sure that the pins are
straight and that all pins are inserted in the receptacles.
4
Turn the system on. The BIOS System Configuration screen
should display 128 KB of cache memory. If 128 KB cache memory
does not display, check for bent pins on the new SRAM chips.
