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Vector 4 - Page 165

Vector 4
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VECTOR
GRAPHIC,
INC.
The
checksum
of
the
SBC
Executive
prom
is
equal
to
its
version
number.
For
a
PROM
with
Version
1.0,
the
checksum
would
be
10H.
4.7.4
Keyboard
1/0O
Auto-Test
The
keyboard
I/O
auto-test
verifies
proper
attachment
and
functioning
of
the
keyboard.
The
test
sends
a
command
byte
to
the
keyboard
processor
via
the
serial
port.
If
the
test
is
unable
to
send
or
receive,
or
if
the
returned
byte
is
not
of
the
expected
value,
the
screen
will
display:
KEYBOARD
I/O
ERROR
This
test
may
result
from
nothing
more
than
a
poor
connection
between
the
keyboard
cable
and
the
SBC
console.
Be
sure
to
check
the
connection
before
performing
going
to
the
Troubleshooting
section
of
this
manual.
III
4-10
7200-0001
09-01-82

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