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Graphic displays can be in the form of a raster-refreshed cathode ray tube in which data to be displayed are stored in a bit-for-pel (picture element) refresh buffer.
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Graphic Display Protect Scheme
Graphic displays can be in the form of a raster-refreshed cathode ray tube in
which data to be displayed are stored in a bit-for-pel (picture element) refresh
By employing an additional protect bit in each graphic data byte in the buffer,
bytes of data rather than fixed size blocks of data can be protected. Fig. 1 shows
this display protect scheme for a graphics display. When a buffer byte location is
accessed and the P bit is found to be set to 1, the contents of the store data
register are written back unchanged under the control of the protect mask bit.
The protect bit may be the parity bit in those display systems where the parity of
point data to the buffer is not checked.
The protect bit is written to store under the control of the disprotect write
mask bit. The procedure requires that a protected display area is created by
turning on the write mask and display protect latches to write a protect bit in
every byte location within the window. The write mask and display protect
latches are then reset and the desired graphic point data are written to the buffer.
Then setting the read mask bit will ensure that all locations within the window
remain protected while the display outside the protected window can be
Fig. 2 shows an example of two protected windows, with window 1 overlaying
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