Cache Size Jumpers
The system board supports 64KB/ 128KB/ 256KB/ 512KB of cache
memory.
Cache Size Jumper Selection
Cache
Size
JP10 JP11 JP12 JP13 JP14 JP15
64KB
1-2
1-2
1-2
2-3
1-2
1-2
128KB
2-3
1-2
1-2
1-2
1-2
2-3
256KB
2-3
2-3
1-2
2-3
2-3
2-3
256KB
2-3
2-3
2-3
1-2
1-2
2-3
Cache Size and SRAM Locations
Cache
Size
Tag RAM
U14
Data Bank 0
U19,U20,
U21,U22
Data Bank 1
U23, U24,
U25, U26
64KB
8Kx8
8Kx8
8Kx8
128KB
32Kx8
32Kx8
None
256KB
32Kx8
32Kx8
32Kx8
512KB
32Kx8
128Kx8
None
VESA Local Bus Jumper
Jumper ID2 allows any VL-Bus adapter to identify the speed of the
system board.
High Speed Write
ID2
System board runs one wait state write
transfer. All VL-Bus adapters can operate
in this mode.
2-3
(Default)
System board runs zero wait state write
transfer. Some VL-Bus adapters may not
be able to run this mode.
1-2
486MI System Board User's Manual Page 9