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SYSTEM CORFIGORATION
1.5
VCB01 VIDEO CONTROLLER
The VCBOl is shown in Figure 1-6.
1.5.1
Switches
The VCBOl switches select:
o
The MSA (Memory Starting Address)
o
The CSR (Control and Status Register) base address
o
Display density
1.5.l.l
Memory Starting Address (MSA) • Switches l through 4
of
switch-pack
El4 select the starting address for the 256 kB block
of MicroVAX physical memory where the VCBOl resides.
Table
1·7
shows the switch settings
1
0 •ON and 1 •OFF).
-
Table 1·7:
VCBOl MSA Selection
+·--·+····+--··+····+
BOAL:
I
21
20
19
18 I
I
+··--+----+---·+·-··+
El4:
i
Sl
52
S3
54 I
+······+····+····+·--·+--·-+
'
(kB)
I
I
+· •. - . ·+·. - ·+· .. ·+· .• ·+· - . ·+
*i
3840
i
l
1
1
l
3584
;
l
l
l
0
3328
l
l
0
l
3072
~
l
l
0
0
2816
l
0
1
1
2560
l
0
l
0
'
2304
l
0
0
1
2048
1
0
0
0
1792
0
l
l
l
1536
0
l
l
0
I
1280
0
l
0
1
1024
0
1
0
0
768
!
0
0
l
1
512
0
0
l
0
256
0
0
0
l
l
>=
OFF
0
0
0
0
O·
0
-
ON
+······+····+····+·-··+·-··+
*
VAXstation
I
setting
The video memory always resides in the topmost 256 kB of the 4 MB
MicroVAX physical address space.
Therefore, all the MSA switches
1-17
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