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FF9A:
Border Register
(AIL bits are
for
CoCo
I
and CoCo
2
compatibility).
BIT
7
BIT
6
BIT
5
=
RED1
Most significant
red bit
BIT
4
= GRN1
Most significant green bit
BIT
3
= BLU1
Most significant blue
bit
BIT
2
= REDO
Least significant
red bit
BIT
1
= GRNO
Least significant green
bit
BIT
= BLUO
Least significant blue bit
FF9B:
Reserved
FF9C:
Vertical Scroll Register
BIT
7
BIT
6
BIT
5
BIT
4
BIT
3
=
VSC3
(Vert.
Scroll)
BIT
2
=
VSC2
BIT
1
= VSC1
BIT
=
VSCO
NOTE:
In the
CoCo mode, the VSC
'
s
must
be
initialized
to OF hex.
FF9D:
Vertical Offset
1
Register
BIT
7
=
Y18
(Vert.
Offset)
BIT
6
» Y17
BIT
5
=
Y16
BIT
4
=
Y15
BIT
3
=
Y14
BIT
2
=
Y13
BIT
1
=
Y12
BIT
=
Yll
FF9E:
Vertical Offset
Register
BIT
7
= Y10
(Vert,
Offset)
BIT
6
=
Y9
BIT
5
= Y8
BIT
4
= Y7
BIT
3
= Y6
BIT
2
= Y5
BIT
1
= Y4
BIT
= Y3
NOTE:
In
CoCo mode, Y15
-
Y9
are not effective, and are controlled by
SAM bits
F6 -
FO.
Also
in
CoCo mode, Y18
-
Y16 should
be
1,
all others
0.
-13-
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