STUPIDSID
1 (a)
Explain the instruction formats and addressing modes of SIC/XE.
10 M
1 (b)
Write a program in both SIC and SIC/XE to copy a character string'System Software' another character string.
10 M
2 (a)
Explain the data structures and pass-1 algorithm of SIC assembler.
10 M
2 (b)
Generate the symbol table and write the object program forthe following SIC/XE program: (Given that: LDX: 04, LDA: 00,LDB: 68, ADD: 18. TIX:2C, JLT : 38, STA: 0C, RSUB:4C).
| SUM | START | 0 |
| FIRST | LDX | #0 |
| LDA | #0 | |
| +LDB | #TABLE2 | |
| BASE | TABLE2 | |
| LOOP | ADD | TABLE, X |
| ADD | TABLE2, X | |
| TIX | COUNT | |
| JLT | COUNT | |
| +STA | TOTAL | |
| RSUB | ||
| COUNT | RESW | 1 |
| TABLE | RESW | 2000 |
| TABLE2 | RESW | 2000 |
| TOTAL | RESW | 1 |
| nbsp; | END | FIRST |
10 M
3 (a)
What are control sections? Explain how linking is performed between control sections.
10 M
3 (b)
Explain how multiple assemebler handles the following forward reference:
Assume that, when assembler goes to line 4, location counter contains 1034 (Ilex).
| 1. | HALFSZ | EQU | MAXLEN/2 |
| 2. | MAXLEN | EQU | BUFFEND-BUFFER |
| 3. | PREVBT | EQU | BUFFER-1 |
| 4. | BUFFER | RESB | 4096 |
| 5. | BUFFEND | EQU | * |
Assume that, when assembler goes to line 4, location counter contains 1034 (Ilex).
10 M
4 (a)
With source code, explain the working of boot-strap loader.
10 M
4 (b)
Explain machine dependent features of loader.
10 M
5 (a)
Explain the overview of editing process.
4 M
5 (b)
Explain editor structures with a diagram.
8 M
5 (c)
Explain the functions and debugging capabilities of interactive debugging system.
8 M
6 (a)
Explain the data structures used in macro processor with example.
8 M
6 (b)
Explain machine independent features of macro processor.
12 M
7 (a)
What are LEX and YACC? Explain the different sections of LEX with example.
10 M
7 (b)
What are regular expressions? Explain the characters used in forming regular expressions.
10 M
8 (a)
What is shift/reduce parsing? Explain the parsing of the input "fred=12+13" and represent using parse tree.
10 M
8 (b)
Explain the ambiguity in arithmetic expression. What is the ambiguity in parsing 2+3×4? Explain the solution for it.
10 M
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