18 Questions
What is the format of the opcode for the LDA instruction in the given SIC/XE machine code?
000000
What type of addressing mode is used in the instruction 'LDA 2 = 0010 x=0, b=0, p=1, e=0'?
PC Relative
What is the purpose of the opcode in a machine code instruction?
Specifies the operation to be performed
What is the difference between the SIC and SIC/XE machine code?
SIC is an older version, while SIC/XE is an updated version
What is the format of the operand in the instruction 'LDA 3600 = 0 011 0110 0000 0000'?
16-bit binary
What type of assembler is needed to assemble the given SIC/XE machine code?
One-Pass Assembler
What is the purpose of the EQU directive in assemblers?
Insert a name and value in SYMTAB
In a one-pass assembler, how are forward references handled?
Forward references are not allowed
Which assembler directive is used to assign values to names in a program?
ORG
In the context of assemblers, what does the LTORG statement indicate?
Literals are defined and assigned memory addresses
What is the purpose of LOCCTR in assemblers?
Tracking the location of instructions in the program
How does a load-and-go assembler generate the object program?
By generating object code directly from the source on one pass
What is the purpose of the START directive in Pass2: Assembling?
To specify the starting address of a program
What is the difference between PC-relative and B-relative addressing?
PC-relative uses the program counter to calculate the address, while B-relative uses the base register
What happens when a program is loaded at a specific address?
The program becomes absolute
What is the purpose of the OPTAB table?
To store the opcode table
What is the difference between a one-pass assembler and a multi-pass assembler?
One-pass assemblers scan the source code once, while multi-pass assemblers scan the source code multiple times
What is the purpose of the symbol table (SYMTAB)?
To store the symbol definitions
This quiz covers the encoding and interpretation of SIC/XE machine instructions. It includes examples of different instruction formats, opcode meanings, and calculation of effective addresses.
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