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PROGRAMMING INFORMATION
Table 2·2:
CSR Bi ts
+· ...... -+-. - • - •. -+- - - - •.. - • - - - - - - - •• - • - - - - - - - - - - • - - ••••••• - - •• ·+
I BITS
I ACCESS I DESCRIPTION
+- - - - - - - ·+- - - - . - - -+- - - - • - - - - • - • - - - - - - •• - - - - - - - •• - - - - - - • - - •• - - - - -+
<15>
(spare - not used)
<14:11>
READ
Memory bank switch 0:3 (MSA switch El4 Sl:S4)
<10:09>
READ
<07>
READ
<06>
RD/WR
<05>
RD/WR
<04>
RD/WR
<03>
RO/WR
<02>
RO/WR
<01>
<00>
READ
Mouse switch
C:A
(0 • closed)
Cursor
a~tive
(1 • cursor on)
Interrupt Enable (1 •enabled)
Test Bit (used with loop-back connector)
Enable video read-back (1 • enabled)
Cursor function (1 •
OR,
0
•AND)
Enable video output (1
~
enabled)
(spare - not used)
19 in/ 15 in mode
(1 •
19 in)
+- - - .•. - -+·. - - .. - -+· - - . - . - - - •• - - - - • - - • - - - - - - - .• - - - - • - - ••• - .. - . - -+
2.1.2
Cursor X Position
This location contains the horizontal position of
the
top
left
corner
of
the
16
X
16
(pixel)
cursor image.
The value is in
pixels and must not allow the cursor to be positioned beyond
the
maximum
x
pixel.
That is, the maximum value is 943 (959 - 16)
for a VRlOO monitor, and
783
(799 - 16)
for
a
38 cm
(15 in)
monitor.
15
10
09
00
+ • - - - - - • - - • - - - - • • • • • - - - • + • • • • • • - • • • • • • - - - • • • - • - - • - • • • • • • - • • • • • • • +
not used
·
i
CURSOR
X
POSITION
+· .•.• - - - . - •. - - . - - - - • - .
·+- .... - . - - - - - - - •••. - - . - ••••. - - . - - - - - - . -
·+
ADDRESS
=
CSR BASE
+
2
Figure 2-2:
Cursor X Position Format
2-3
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