Owner`s manual

A3.5 Page Frame Registers
The page frame registers are used to store the mapping
values which determine the starting address for the page
frame in the physical memory space of your computer.
These registers are write only. Choose one of the eight pos-
sible
starting addresses by writing different values to the
page frame registers. Only bit 7 (MSB) is used to set up
these registers.
Table 14 gives the values that should be as-
signed to a
particular page frame register with respect to a
page
frame starting address.
TABLE 14
Page Frame Registers
Page Frame Register MSB
82X9 42X9 02X9 Page Frame Starting Address
Where D is bit 7
D D
D
0 0 0 C4000 784K
0 0 1
C8000
800K
0 1 0 CCOOO 816K
0 1 1 DOOOO 832K
1 0
0
04000
848K
1 0
1
D8000
864K
1 1 0
DDOOO
880K
1 1
1
EooOO
896K
NOTE: Bit 0 to Bit 6 are don't cares.
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