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Section C:
Graphics Interface
************************************************************************
*
*
*
0 - Initialize Graphics
*
*
*
************************************************************************
Parameters:
DB
Graphics Instruction Code
The Graphics driver is re-initialized.
************************************************************************
*
*
*
l - Erase Graphics
*
*
*
************************************************************************
Parameters:
DB
1
Graphics Instruction Code
All Graphics are erased.
************************************************************************
*
*
*
2 - Erase Partial Graphics
*
*
*
************************************************************************
Pa,r ameter s:
DB
DW
DW
DW
2
Xl,Yl
X2,Y2
COLOUR
Graphics Instruction Code
Upper left coordinates
Lower right coordinates
Colour
This
function
allows
for selective erasure of
graphics.
rectangle
specified
by
its diagonal coordinates Xl,Yl and
colour combination COLOUR is erased in all objects.
COLOUR
as a combination of three bits meaning:
Within
the
X2,Y2,
the
is
regarded
Bit
0
~
blue parts, bit
1
~
red parts, bit
2
~
green parts.
The values permitted for the parameters are as follows:
X
-
0
to 639
y
0
to 399
COLOUR
-
0
to
7
EOS System manual
Daeumling & Zimmermann
Page 170
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