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SYSTBK CORFIGURATIOR
are set to OFF; that is,
BDAL<21:18>
select
the
256 kB
block
starting at 3840 k.
1.s.1.2
CSR Base Address - As Table 1-8 shows,
BDAL<l7:13>
are
all
ls
(ones), giving an address range of 7600xx through 7777xx
·(octal).
Switches l through 7 of switch-pack E48
correspond
to
BDAL<l2:06>,
and
select
the CSR base address (that is, the I/0
registers base
address).
BDAL<05:01>
select
one
of
the
32
registers;
and
BDAL<OO>
is byte select and
MBZ
(must be zero).
Currently, in the VAXstation I, E48 switchesS7:Sl are set to·112
(octal).
This makes BDAL<l7:00> • 7772xx (octal; 3FExx, hex).
Table 1·8:
CSR Base Address Select
+ - - • - •• - - - • - - - - + - - - - - - - - - - - - - - - - - - - - + • - - -·- - - - - - ••• - + • - +
BOAL: 117 .. 16 15 14 13112 11 10 09 08 07 06105 04 03 02 011001
+· - ..•. - - - . - . - ·+· .. - .... - •. - - .. - •. - -+- - ... - - .•... -
-+-
·+
I (HARD WIRED) I CSR BASB ADDRBSS
I CSR SELECT
+- - - - - - .. - • - .• -+- .• - • - .. - - - - . - - - - - - -+- - - - . - - - - - - - . -+- -+
E48:
I
I
S7 S6 SS S4 S3 S2 Sl
I
I
I
I
1
l
1
1
11 1
1
1
1
o
1
01 x
x
x
x
xi 01
+---·-···+-----+--+--------+------··+···-····+·-···+··+
OCTAL:
7
7
I
7
2
X
X
I
+· ..•... ·+· - - •• - • ·+·. - - - . - -+- - - - - - - -+- - - - - •. ·+- - - •.• - ·+
1.S.1.3
Display
Density · Switch
E68
and
switch
S8
of
switch-pack
E48
select
either a full-page or half-page monitor
(Table 1-9).
The VRlOO is a full-page
monitor
and
E68
is
ON
(position C2); E48 SS is OFF.
Table 1·9:
Display Density Selection
+- - . - - - - • - - - - • -
·+· ... - - - - ... - - .
·+
l FULL·PAGE
i HALF-PAGE
I MONITOR
l
MONITOR
i
+- - - - •.• - -+- - - - - - • - - • - - . - ·+· - . - - - - - • - - ... -+
B68
OR (C2)
OFF (Cl)
I
B48 S8
OFF
ON
I
I
+- - - - - • - •
·+· - . - - - . - - - - - - . -+·. - - - - - - - .. - ..
·+
j
DIAGNOL
!
48 cm (19 in) l 38 cm (15 in) :
I
I
I
I PIXELS
j
829 k
I 384 k
+. - - .. - - .. + •••• - - • - • - •••• ·+. - . - - - - .. - - . - - . +
1-18
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