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Resetting Operation
Key
combination
at
Reset:
You can
use a
RESET
switch
on
the
left
side
of
Tandy 600 as
/
follows.
Hold
LABEL
+
ALT +
BKSP
and Push
RESET:
Cold-Start
Hold
no keys and Push
RESET:
Warm-Start break
Hold
SHIFT +
PAUSE
and Push
RESET:
Warm-Start break
Hold
LABEL +
ALT +
ESC
and Push
RESET:
Load unco-op
sys.
(Hold
keys
after
pushing
RESET,
and
release
them
a
little
bit later.)
NOTE:
The resume
information
used
at
the
warm-start
resume
is
stored
after
NMI
interrupt,
i.e.
power-off. Therefore,
you cannot cause
a warm-start
resume
by
using the
reset-switch,
because
of
the lack
of
resume
information.
If
you push
only the
RESET
switch,
the
Tandy 600
begins
warm
start
break.
Further Considerations
Regarding
Warm
Start
Break
Within the
O/S,
there are
critical
regions
of
code
that
must
be allowed
to
complete
once
they
are
begun.
These
regions include
file
management
operations
that
cause
memory
files
to
move, and database
functions
that
modify
the contents
of
a
database
file.
If
one
of
these
regions
were
entered, but not allowed
to
complete, the
in-memory
file
system would be
destroyed,
or
a database
file
would be
corrupted.
Some
of
these
critical
code
regions
can
take
sufficiently
long
to
execute,
that
it
is
not
reasonable
to
turn interrupts
off
while executing
them.
Also,
if
power
off
requests occur
via
NMI,
it
would
not
be
possible
to
prevent
one
from
occurring.
Because
these
critical
regions
of
code can be
interrupted
by a
power
off
request,
it
is
essential that
they complete
when
the
power
is
restored.
167
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