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TNL SN20-9844 (March 1987) to 75X0235
Cursor Save Register
DATA FIELD
71
8
I I
I I
Figure 11. Cursor Save Registers (Address X'D9FSOA', 'D9FSOC', 'D9FSOE')
Note: These registers are not initialized with a POR or reset adapter command.
The cursor save registers are used by the graphic operation processor when the display cursor is
active. Bit map data may be lost if these registers are accidentally written.
Mode Shadow Register
DATA FIELD
71
8
I I
I I
Figure 12. Mode Shadow Register (Address X'D9FSI2')
The mode shadow register is updated each time the mode register is written (see "Mode
Register" on page 24). The programmer can read this register to determine the most recent data
written to the mode register. Since the current mode register state affects the reading of the
mode shadow register, the mode register should be set to horizontal access with start bit
displacement set to zero. The mode shadow register is only useful in determining the current
state of logic function bits and the write mask count.
20 Extended Monochrome Graphics Adapter
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