High Resolution Mapping - Zenith Z-100 Reference Manual

Page 7.14
Video Graphics Programming
High Resolution (640 x 200) Graphics
The high resolution (640 x 200) graphics submode may only be implemented
in a monochrome format because of memory limitations. Addressing and mapping
is the same as medium (320 x 200) resolution but formatting of the data is
different In this submode each bit, as opposed to a bit pair. represents a pixel
on the screen as shown in Figure 7.6.
V ideo me mory b y t e
7 6 5 4
1st 2n d 3 r d 4 t h 5 t h 6 t h 7 t h 8 t h
Pixel
Figure 7.6. High Resolution Mapping
2 1 0
3