Computer system question SIC/XE
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(d) Suppose memory addresses 21, 33 and 2700 (all decimal) of a SIC/XE machine contain the values
2400, 2700 and 33 (all decimal) respectively. The A register (i.e., the accumulator) contains the value
?17 (decimal) when the machine executes the 3-byte instruction whose hexadecimal representation
is 320021. Show the contents of the memory locations 21, 33 and 2700 after the execution of the
instruction. Your answers must be in decimal. Show work. (10 points)
Note: The 6-bit opcode 001100 corresponds to the STA (Store Accumulator) instruction.
(e) Consider the following instruction for SIC/XE:
JEQ LOOP The LC-value for the above instruction is 250 (decimal) and the LC-value for the symbol LOOP is
234 (decimal). Assuming that the instruction is being assembled using PC-relative mode, show the
assembled form of the instruction in hexadecimal form. The 6-bit opcode for JEQ is 110000. Show
work. (12 points)
(f) Consider the following module written in SIC/XE Assembly language.
FIRST LOOP BLOCK
FIRST Show the symbol table produced by a 2-Pass assembler for the above module. The LC-values shown
in the Symbol Table must be in decimal. (12 points) 1
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Oct 14, 2020EXPERT
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