Atari ST series Technical Reference Manual page 337

+ 026 to +027
The color bit plane value
+ 028 to +029
The color bit plane value
+ 030 to +031
The color bit plane value
+ 032 to +033
This is a flag which indicates whether the last pixel of a line
should be drawn. A zero value means that the pixel is
drawn, while a nonzero value means that it is not drawn.
This flag is used for drawing a series of connected lines us­
ing the XOR writing mode, so that the common endpoint
doesn't disappear when the second line is drawn.
+ 034 to +035
The line-draw pattern mask.
+ 036 to +037
The VDI Writing mode to use for drawing.
Meaning
Mode
Replace
0
1 Transparent,
2 XOR
Reverse transparent
3
For TextBlt, the BitBlt logic modes may be stored here i
well:
Logic Operation
Mode
D1 = 0
4
D1 = S AND D
5
D1 = S AND (NOT D)
6
7 D1 = S
D1 = (NOT S) AND D
8
The Line A Variable Table
COLBIT1
for plane 1 of the display.
COLBIT2
for plane 2 of the display.
COLBIT3
for plane 3 of the display.
LSTLIN
LNMASK
WMODE
Clear destination block
Replace mode
Erase mode
( + $01A to + $01B)
( + $01C to +$01D)
( + $01E to +$01F)
( + $020 to +$021)
( + $022 to +$023)
( + $024 to +$025)
Description
329