Cache Size Jumpers
The system board supports 64KB/ 128KB/ 256KB/ 512KB of cache
memory.
Cache Size Jumper Selection
Cache
Size
JP7
JP8
JP9
JP10 JP11 JP12 JP13 JP14 JP15
64KB
1-2
1-2
1-2
1-2
1-2
1-2
1-2
1-2
2-3
128KB
1-2
1-2
2-3
2-3
2-3
1-2
1-2
1-2
1-2
256KB
2-3
1-2
2-3
2-3
2-3
2-3
2-3
1-2
2-3
512KB
2-3
2-3
2-3
2-3
2-3
1-2
2-3
2-3
1-2
Cache Size and SRAM Locations
Cache
Size
Tag RAM
U15
Data Bank 0
U20,U21,
U22,U23
Data Bank 1
U24, U25,
U26, U27
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 zero wait state write
transfer. Some VL-Bus adapters may not
be able to run this mode.
1-2
System board runs one wait state write
transfer. All VL-Bus adapters can operate
in this mode.
2-3
(Default)
486MIS System Board User's Manual Page 9
