IBM RT Series Hardware Reference Manual page 354

TNL SN20-9844 (March 1987) to 75X0235
DESTINATION RECTANGLE
~
_____________ e_xc_lu_s_iV_e_(X_D_'_Y_D_) ____
~
l}
(DY)=20
SOURCE RECTANGLE
(XS, YS) LOWER RIGHT CORNER
I
exclusive
~--------------r-------------~
(OX) = 700
Figure 28. Copy Character Line (XD
=
768, YD
=
20, XS
=
800, YS
=
30, DX
=
768, YD
=
16)
To achieve a merge operation while copying the source data one of these subtypes must be
specified.
Rectangular Merge And:
Rectangular Merge And.,:
Rectangular Merge., And:
Rectangular Merge XOR:
Rectangular Merge OR:
Rectangular merge .,OR:
Rectangular merge .,OR.,:
LF
=
1, Source
&
destination
=
Result destination
LF
=
2, Source &., destination
=
Result destination
LF
=
8, ., Source & destination
=
Result destination
LF
=
A, Source XOR destination
=
Result destination
LF
=
B, Source OR destination
=
Result destination
LF
=
C, ., Source OR destination
=
Result destination
LF
=
E, ., Source OR ., destination
=
Result
destination
While copying the source, data is merged with the destination via subtype specification.
42 Extended Monochrome Graphics Adapter