Air 486SH, Руководство пользователя, Страница: 9 / 39

Cache Size Jumpers
The system board supports 64KB/ 128KB/ 256KB of cache memory.
Cache Size Jumper Selection
Cache
Size
JP1 JP2 JP3 JP20 JP21
64KB 1-2 2-3 1-2 1-2 1-2
128KB 1-2 1-2 2-3 1-2 2-3
256KB 2-3 2-3 2-3 2-3 2-3
Cache Size and SRAM Locations
Cache
Size
Tag RAM
U36
Data Bank 0
U2,U4,U6,U
8
Data Bank 1
U1,U3,U5,U
7
64KB 8Kx8 8Kx8 8Kx8
128KB 32Kx8 32Kx8 None
256KB 32Kx8 32Kx8 32Kx8
VESA Local Bus Jumpers
Jumper JP4 allows any VL-Bus adapter to identify the speed of the
system board.
High Speed Write JP4
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
486SH System Board User's Manual Page 9