IBM RT Series Hardware Reference Manual page 358

TNL SN20-9844 (March 1987) to 75X0235
Rectangular Copy/Merge 180 X Axis Symmetry (X'33')
This graphic operation type is similar to the rectangular copy/merge graphic operation. The
destination and source rectangular areas should not overlap.
DESTINATION
(XD, YD) LOWER RIGHT CORNER
exclusive
L...-_ _ _ _ _ _
S_O_U_R_C_E _ _ _ _ _
----.11 ] -
DELTA Y
+
1
~
IDYl
(XS, YS) LOWER RIGHT CORNER
I
exclusive
L...-_ _ _ _ _ _ _ ~~------~
DELTA X
+
1 = (oX)
Figure 32. Flip Window 180 Degrees Along the X Axis
46 Extended Monochrome Graphics Adapter