---
aliases: 
up: 
tags:
  - s/informatique
---



# Assembleur
## opérations de l'ALU

| Hex | Bin  | ALU operation         |
| --- | ---- | --------------------- |
| 0   | 0000 | A                     |
| 1   | 0001 | B                     |
| 2   | 0010 | A+B                   |
| 3   | 0011 | A-B                   |
| 4   | 0100 | A XOR B               |
| 5   | 0101 | A AND B               |
| 6   | 0110 | A+1                   |
| 7   | 0111 | A-1                   |
| 8   | 1000 | ¬A                    |
| 9   | 1001 | ¬B                    |
| A   | 1010 | ¬(A+B)                |
| B   | 1011 | ¬(A-B)                |
| C   | 1100 | ¬(A XOR B) = A NXOR B |
| D   | 1101 | ¬(A AND B) = A NAND B |
| E   | 1110 | ¬(A+1) = -A-2         |
| F   | 1111 | ¬(A-1) = -A           |
## branches
- `100·  ···· JMP to #A`
- `101·  ···· JMP to #B`
- `110·  ···· JMP to #RAM[A]`
- `111·  ···· JMP to #addr`

- ! `1···  0·00 JMP`
- ! `1···  0·01 JMP if A=0`
- ! `1···  0·10 JMP if A=B`
- ! `1···  0·11 JMP if overflow`
- ! `1···  1·00`
- ! `1···  1·01 JMP if A≠0`
- ! `1···  1·10 JMP if A≠B`
- ! `1···  1·11 JMP if overflow`


# Programmes

## Multiplication
```
3000
700D
3001
700B
3002
7000
3000
5000
3002
4000
1200
3002
2100
3001
4000
1700
3001
2100
0000
4000
E906
3002
FFFF
```