# r16

| number | instruction | argument 1 | argument 2 | explanation                                       |
|-------:|:-----------:|:----------:|:----------:|---------------------------------------------------|
|   0x00 |     HLT     |            |            | halts the CPU                                     |
|   0x01 |     ADD     |   value 1  |   value 2  | ACU = value 1 + value 2                           |
|   0x02 |     SUB     |   value 1  |   value 2  | ACU = value 1 - value 2                           |
|   0x03 |     MUL     |   value 1  |   value 2  | ACU = value 1 * value 2                           |
|   0x04 |     DIV     |   value 1  |   value 2  | ACU = value 1 / value 2                           |
|   0x05 |     LBS     |    value   |   amount   | ACU = value << amount                             |
|   0x06 |     RBS     |    value   |   amount   | ACU = value << amount                             |
|   0x07 |     BAN     |   value 1  |   value 2  | ACU = value 1 & value 2                           |
|   0x08 |     BOR     |   value 1  |   value 2  | ACU = value 1 \| value 2                          |
|   0x09 |     BXO     |   value 1  |   value 2  | ACU = value 1 ^ value 2                           |
|   0x0A |     BNO     |    value   |            | ACU = ~ value                                     |
|   0x0B |     PUS     |    value   |            | pushes value onto the stack                       |
|   0x0C |     POP     |            |            | pops a value from the stack and stores it in ACU  |
|   0x0D |     JMP     |   address  |            | jumps to address                                  |
|   0x0E |     JEQ     |   address  |    value   | jumps to address, if value is equal to ACU        |
|   0x0F |     JNZ     |   address  |    value   | jumps to address, if value is not zero            |
|   0x10 |     CAL     |   address  |            | pushes PC + 1 to the stack, then jumps to address |
|   0x11 |     RET     |            |            | pops value from stack and jumps to it             |
|   0x12 |     REG     |  int type  |   address  | registers int type to address                     |
|   0x13 |     INT     |  int type  |            | interrupts as int type                            |
|   0x14 |     INP     |            |            | inputs a character into ACU                       |
|   0x15 |     OUT     |    value   |            | outputs value                                     |
|   0x16 |     DIN     |  location  |            | reads value from disk at location to ACU          |
|   0x17 |     DOT     |  location  |    value   | writes value to disk at location                  |

| Number | Register | Usage           |
|:------:|---------:|-----------------|
|   0x0  |       R0 | general usage   |
|   0x1  |       R1 | general usage   |
|   0x2  |       R2 | general usage   |
|   0x3  |       R3 | general usage   |
|   0x4  |      ACU | Accumulator     |
|   0x5  |       PC | Program Counter |
|   0x6  |       SP | Stack Pointer   |

|  Area of RAM  | reserved | usage             |
|:-------------:|:--------:|-------------------|
| 00000 - 00064 |    NO    | system header     |
| 00064 - 65263 |    NO    | executable        |
| 65263 - 65519 |    YES   | interupt pointers |
| 65519 - 65535 |    YES   | stack             |

| BYTE 1     |             |             | BYTE 2     | BYTE 2     |
|------------|-------------|-------------|------------|------------|
| OPCODE     | arg 1 info  | arg 2 info  | ARGUMENT 1 | ARGUMENT 2 |
| bit 0 - 12 | bit 12 - 14 | bit 14 - 16 | bit 0 - 16 | bit 0 - 16 |

| State | Argument Interpretation                     |
|------:|---------------------------------------------|
|   0x0 | Value in argument                           |
|   0x1 | Value in register                           |
|   0x2 | Value in RAM                                |
|   0x3 | Value in RAM, at address stored in register |