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TNL SN20-9844 (March 1987) to 75X0235
Programming Model
The Extended Monochrome Graphics Display Adapter appears as two separate memory maps to
the system:
•
A memory map
•
A I/O Map.
Memory Map
A 128K-block of memory is addressable as a part of the I/O channel memory map. A
contiguous 96K-byte segment of this block is used as the adapter video frame buffer. The
remainder is hidden memory in the sense that it is not displayable on the monitor.
It
is,
however, otherwise indistinguishable from the video frame buffer at the programming interface
level.
6 Extended Monochrome Graphics Adapter
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