Atari 800

A.
ATARI
Consumer Product
Service
Manager of
TehnicaJ Support
TECH
TIP
number
MOOEL;
Atari MO/800
Computers
DATE:
May
2S,
1982
SUBaECT:
Revision B,
Operating
System
ROMS.
DESCRIPTIONS
New
Atari WO/800
computers
contain
Revision B
ROMs
—
a refined
version
of
an
Operating
System
ROM,
which
has
a different
checksum
from
Revision
A ROMs.
When
repiacing
these
components,
do not
mix revision
leveia.
System
will
not operate
if Revision
A
is
paired with
Revision
B.
Parts:
Old ROMS:
Cai2W9A
and C0U599A
Rev
B ROMS:
C012W9B
and
C0U599B
Part
Locations
*00
Computer
System
-
Motherboard
location
A103
(C014599)
and
AlO*
(C012W9)
800 Computer
System
-
Personality
Board
Location
AW1.(C01*599)
and
A403
(C012'J99).
You
can
recognize
the
new
part in
this manner:
Top
is imprinted
with
a copyright
symbol
followed
by 1981
Atari.
TROUBLESHOOTING
AND
MAINTENANCE
PROCEDURESs
For
troubleshooting,
maintenance
and testing,
observe
warnings
and
cautions
stated
in
Atari
*00/8CO
Home
Computer
System
Service
Manual.
Before
a
component
or board
IS
added
to
or removed
from
the
system,
power
the
system down.
If
ROM
chips are
defective
or if
printer
overprints
(hiccups),
replace
ROM
chips.