Booting
the
Disk
Unit
After
connecting
the
disk
unit
to
the
computer
an
attempt
can
be
made
to
boot
the
system.
Before
booting
the
system
be
sure
that
the
computer
and
disk
are
both
powered
up.
Next
insert
a
diskette
containing
the
disk
operating
system
into
drive
0
and
close
the
door.
The
boot
can
then
be
executed
to
load
the
operating
system.
Computers
containing
a
DISKBUG®
or
SBUG-E© monitor
have
an
internal
disk
boot
which
is
executed
by
enterin
a
D command.
Users
without
those
monitors
must
enter
the
boot
by
han
as
listed
in
the
disk
operating
system
software
documentation.
Problems
If
any
problems
are
encountered
in
booting
the
disk
unit,
the
REGTEST
and
STEPTEST
diagnostics
may
be
used
to
determine
if
the
disk
controller
is
operating
properly.
Power
up
the
computer
system
and
the
disk
unit.
The
disk
unit
is
on
when
the
cooling
fan
runs.
If
you
do
run
into
some
kind
of
problem(s)
check
the
following:
1.)
Make
sure
you
have
at
least
20K
of
RAM memory.
2.)
Run
the
memory
diagnostics
and
verify
this
memory.
to
be
good.
3.)
Makes
sure
the
disk
controller
board
is
properly
programmed
with
the
shorting
blocks.
4.)
Makes
sure
the
DMAF2 disk
controller
board
is
plugged
onto
the
computer
system
and
is
properly
seated.
5.)
Make
sure
the
flat
ribbon
cable
is
plugged
on
the
disk
controller
board
and
is
oriented
correctly.
6.)
Makes
sure
the
flat
ribbon
cable
is
plugged
onto
both
disk
drives
and
is
oriented
correctly.
Check
the
orientation
very
carefully.
7.)
Make
sure
the
power
connectors
are
plugged
into
their
mates
on
the
back
of
both
drives.
8.)
Makes
sure
the
miniature
connector
going
to
the
FD-M
motor
control
board
is
oriented
properly
and
plugged
onto
the
connector
pins
as
specified
in
the
instruction
set.
9.)
Confirm
that
the
cooling
fan
on
the
disk
system
is
running.
It
should
run
whenever
the
disk
system
is
turned
on.
10.)
Make
sure
you
have
the
proper
diskette
installed
in
the
system.
11.)
Run
the
REGTEST
diagnostic
(details
follow).
12.)
Run
the
STEPTEST
diagnostic
(details
follow).