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FF9F:
Horizontal Offset
Register
BIT
7
= HVEN!
Horizontal Virtual Enable
BIT
6
=
X6
Horizontal Offset address
BIT
5
=
X5
Horizontal Offset address
BIT 4
=
X4
Horizontal Offset address
BIT
3
= X3
Horizontal Offset address
BIT
2
= X2
Horizontal Offset address
BIT
1
= XI
Horizontal Offset address
BIT
=
XO
Horizontal Offset address
NOTE:
HVEN enables
a
horizontal screen width of
128
bytes regardless of
the
HRES bits and CRES bits selected. This will allow
a
"virtual" screen
somewhat larger than
the
displayed screen. The user
can
move
the
"window"
(the
displayed screen)
by
means
of the
horizontal offset
bits. In
character mode,
the
screen width
is
128
characters regardless
of
attribute
(or
64,
if
double-wide
is
selected).
-14-
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