Sage II - Page 88

SAGE
rr
SERVTCE MANUAL
[1.0]
HARDWARE
CHANGES
ON SAGE
II
XIX HARDWARE
CHANGES
ON SAGE
II
:
Varlous
srnall
changes have
been made to
the
SAGE II
model. To
date
these
changes
do
not
change
the
functional
operation
of the
SAGE
II with
the
posslble
excepEion
of the
CTS
remote
port
changes and
PR0M updates.
These changes are
mlnor and
can be done on
site or
at the
SERVICE CENTER
f
airly
quickly
wlth llttle
c.osmetic ef
f
ecr.
XIX"OI
PNOU
CHANGES :
Changes
to the
Boot
PROMS
notes
ln
the
SAGE
II lJsers'
and
BI0S are
well-doctrmented
ln
the
RELEASE
Manual.
XIX.O2 CPU
BOARD
CHANGES
The
verslons
of
the
SAGE II CPU
board have
different
part
numbers:
C80000
-Shipped
Jun
1982
ro
Ju1 Lggz
CB000l
-Shipped
Jul
1982
ro
Dec
1982
CB0002
-Shlpped
Dec
1982 ro
1983
CB0002B
-Shipped
1983
to
Details of
the
changes follow.
xlx.03
cHANcEs
FROH
C80000
TO
C8000I
:
The CB0000s
were
modified
by
the
factory
to be
as nearly
identical
electri"cal-1y
as
possible
to
the
CB000l.
Any
problems
with
the
C80000
should
be
referred
to the
factory.
Both the
C80000
and
C80001 have
32K
of address
space
decoded
for
I/O.
Newer
versions
of
the
CPU board
have
a
portlon
of thls
space
mapped for
the new
SAGE
trV
products.
fhe
"M0D"
page
of the
schematics
shows
the
clrcult layout
added
to
the new
boards
which
w111
a1low
the
user
to
free
up unused
T/O space.
C8000
and
C80001
do not have
this
clrcuit
so
they
cannot
be
easlly
modifted
to
be used in
a
SAGE
IV.
Pln I of
the fourth
row
of
RAM
was
tied
to
ground
instead
of +5V.
A sllkscreen
of
the
parts
location
was
added
to
cB000l.
A
darnping
reslstor
was
put
ln
series
on
the
DSmhz slgnal.
changes
were
made
to
the
Ground
plane
and +5v
plane
layouts.
A
mounting
screw
was
unconnected
from
ground
plane.
Refresh
counter
circuit was
changed.
Ul3-6
was
cut from
Ul3-ll and
connected
to
U13-13.
79