HUNTER OPERATION
SECTION 2.9
2.9.1
2,9,2
2.9,2,1
-
PANIC- --- -. / .
HUNTER is designed, built and quality tested for robustness in
every sense including robustness of program execution.
HUNTER'S microprocessor system has wide design tolerances (much
more than conventional computers) to guarantee absolutely
reliable execution of millions upon millions of machine-code
instructions every hour. Its physical construction protects it
against mechanical disturbance, while the conventional
computer's Achilles heel - external electrical interference - is
virtually eliminated.
Becaus·e of these factors, HUNTER is most unlikely ever to mis-
execute a user's program or behave in a way that is not
thoroughly predictable, given sufficient insight.
CRASHES
However, there are some specific situations that can cause
HUNTER
to mis-execute its internal programming, or "Crash",
The commonest causes are:
Illegal System Calls
System calls from Basic are not •trapped' (this would restrict
user programming) and can cause mis-execution if not valid,
2.9.2.2 Invalid user machine code
User assembly-level programs or subroutines can easily cause
mis-execution by containing, for instance, invalid jump
instructions.
2.9.2.3 Physical degradation
Ingress of water, corrosion of internal parts, damage to
components through excessive shock or persistent high level
vibration can reduce electronic tolerances.
2, 9, 2. 4 Operation outside specified temperature range
VER.V09F
HUNTER is specified for operation in the range Oto 55°C.
Operation above 55°c reduces tolerances, while below
o
0
c battery
capacity becomes severely restricted, Sub-zero temperatures
also slow LCD screen response time substantially. HUNTER is
unlikely to mis-execute program simply because of low
temperatures, however, in the range
o
0
c to -20°c,
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