Instruction Set used in SIC/XE
Last Updated :
29 Aug, 2023
Pre-Requisite: SIC/XE Architecture
SIC/XE (Simplified Instructional Computer Extra Equipment or Extra Expensive). SIC/XE is an advanced version of SIC. Both SIC and SIC/XE are closely related to each other that’s why they are Upward Compatible.
Below mentioned are the instructions that are used in SIC/XE (Simplified Instructional Computer Extra Equipment or Extra Expensive) Architecture. You can view the instructions that are particularly used in SIC Architecture.
Before Proceeding to the table, we will be clear that M stands for Memory R1 and R2 are registers (A, B, S, T).
| ADDR |
R1, R2 |
90 |
R2 = R2 + R1 |
| CLEAR |
R1 |
04 |
R1 = 0 |
| COMPR |
R1, R2 |
A0 |
compares R1 and R2 |
| DIVR |
R1, R2 |
9C |
R2 = R2 / R1 |
| LDB |
M |
68 |
B = M |
| LDS |
M |
6C |
S = M |
| LDT |
M |
74 |
T = M |
| MULR |
R1, R2 |
98 |
R2 = R2 * R1 |
| RMO |
R1, R2 |
AC |
R2 = R1 |
| SHIFTL |
R1, n |
A4 |
left shifts R1 n times |
| SHIFTR |
R1, n |
A8 |
right shifts R1 n times |
| STB |
M |
78 |
M = B |
| STS |
M |
7C |
M = S |
| STT |
M |
84 |
M = T |
| SUBR |
R1, R2 |
94 |
R2 = R2 – R1 |
| TIXR |
R1 |
B8 |
X = X + 1; compares X and R1 |
FAQs on Instruction Set in SIC/XE
Q.1: What are opcodes in SIC/XE?
Answer:
Opcodes are simply the operation codes that help in representing specific machine instructions in the SIC/XE assembly language.
Q.2: What is working of Immediate Addressing?
Answer:
Immediate Addressing involves a constant value embedded in instruction itself instead of a address.
Q.3: How many types of addressing modes are present in SIC/XE?
Answer:
SIC/XE supports 5 types of addressing modes:
- Simple (S)
- Immediate (I)
- Indirect (N)
- Indexed (X)
- Extended (B)
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