Explain the function of the status register (flag register), and give an example.
What will be an ideal response?
Analysis:
The status register ( flag register) is the one used when acting on comparison statements, such as "If Greater Than ...", etc. The Status Register is a 16-bit register, however only 9 bits are utilized. The register looks as follows:
x x x x O D I T S Z x A x P x C
The 'x' represents a bit which is not used, while the letters are bits which hold the following conditions:
O Overflow Flag
D Direction
I Interrupts Enabled
T Trap Flag
S Sign of operation
Z Zero Flag
A Auxiliary Carry
P Parity Flag
C Carry Flag
As an example, when one compares two numbers and wishes to Jump to the location called Label in the program the operation which is in fact performed is the subtraction of the two numbers and a Jump is executed if the Zero Flag is set (i.e. Z=1). You may compare this to a GO TO statement in FORTRAN or Basic.
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What is the electrical symbol shown in the accompanying figure?
A. Range outlet B. Convenience outlet C. Wall switch D. Ceiling light fixture
What important limitation of range diagrams relating to load radiuses must operators take into account when consulting them?
a. The diagram does not show boom deflections under load.
b. Load radiuses shown on the diagram don’t relate to boom configuration.
c. Load radii as shown reflect gross capacities before any deductions.
d. The diagram pertains to net loads at the indicated load radiuses.
