Assembler implementation based on Nand2Tetris book.
Current plan is to be using forth and/or C.
16-bit instruction sets:
- Addressing Instructions
0XXX XXXX XXXX XXXX
- Computing Instructions
111A CCCC CCDD DJJJ
| a = 0 | c1 c2 c3 c4 c5 c6 | a = 1 |
|---|---|---|
| 0 | 1 0 1 0 1 0 | |
| 1 | 1 1 1 1 1 1 | |
| -1 | 1 1 1 0 1 0 | |
| D | 0 0 1 1 0 0 | |
| A | 1 1 0 0 0 0 | M |
| !D | 0 0 1 1 0 1 | |
| !A | 1 1 0 0 0 1 | !M |
| -D | 0 0 1 1 1 1 | |
| -A | 1 1 0 0 1 1 | -M |
| D+1 | 0 1 1 1 1 1 | |
| A+1 | 1 1 0 1 1 1 | M+1 |
| D-1 | 0 0 1 1 1 0 | |
| A-1 | 1 1 0 0 1 0 | M-1 |
| D+A | 0 0 0 0 1 0 | D+M |
| D-A | 0 1 0 0 1 0 | D-M |
| A-D | 0 0 0 1 1 1 | M-D |
| D&A | 0 0 0 0 0 0 | D&M |
| D|A | 0 1 0 1 0 1 | D|M |
| dest | d1 d2 d3 |
|---|---|
| null | 0 0 0 |
| M | 0 0 1 |
| D | 0 1 0 |
| MD | 0 1 1 |
| A | 1 0 0 |
| AM | 1 0 1 |
| AD | 1 1 0 |
| AMD | 1 1 1 |
| jump | j1 j2 j3 |
|---|---|
| null | 0 0 0 |
| JGT | 0 0 1 |
| JEQ | 0 1 0 |
| JGE | 0 1 1 |
| JLT | 1 0 0 |
| JNE | 1 0 1 |
| JLE | 1 1 0 |
| JMP | 1 1 1 |
Addressing Instructions: @value
- where the value is a non-negative decimal number
Computing Instructions: dest=comp;jump
- either the dest or jump fields may be empty
| Label | RAM address | hex |
|---|---|---|
| SP | 0 | 0x0000 |
| LCL | 1 | 0x0001 |
| ARG | 2 | 0x0002 |
| THIS | 3 | 0x0003 |
| THAT | 4 | 0x0004 |
| R0-R15 | 0 - 15 | 0x0000 - 0x000F |
| SCREEN | 16384 | 0x4000 |
| KBD | 24576 | 0x6000 |
-
List out all the instructions in assembly and machine code to estimate workload
-
Set up development environment