Commodore Amiga - Chapter 7: SYSTEM CONTROL HARDWARE

(2)3
1
(1 )
(3)
1
6 (0)
5
4 (7)
(4)
2
0
(5)
(6)
Figure 6-10: Octants for Line Drawing
In figure 6-10, the number in parentheses is the
octant number and the other number
stands for bits 4, 3, and 2 of register BLTCONI as shown in table 6-3. Also see the
table at the end of the description of BLTCONI in appendix A.
Table
6-3: BLTCONI Code Bits for Octant Line Drawing
BLTCONI Code Bits
432
Octant #
1 1 0
0
o 0
1
1
0 1 1
2
1 1 1
3
1 0 1
4
1 0 0
5
000
6
100
7
Blitter Hardware
185