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# 8-Bit CPU Emulator
## CPU Architecture
- Word Size
- **Data Width:** 8 bits
- **Address width:** 16 bits
- **Address space:** 64 KB (0x0000-0xFFFF)
## Supported Instructions
| Instruction | Syntax |
| ----------- | ---------------- |
| MOV | mov dest, src OR mov reg, imm |
| ADD | add r1, r2 OR add reg, imm |
| SUB | sub r1, r2 OR sub reg, imm |
| JMP | jmp addr OR jmp addr |
| JZ | jz addr OR jz addr |
| JNZ | jnz addr OR jnz addr |
| CMP | cmp r1, r2 OR cmp reg, imp |
| MUL | mul r1, r2 |
| DIV | div r1, r2 |
| CALL | call \<label\> |
| SYS | sys \<syscall_no\> |
| HLT (Halt) | hlt |
## Registers
| Register | Size | Description |
| -------- | ------ | ------------------------------ |
| A | 8-bit | General |
| B | 8-bit | General |
| C | 8-bit | General |
| D | 8-bit | General |
| PC | 16-bit | Program Counter |
| SP | 16-bit | Stack pointer |
## Flags
| Flag | Description |
| ----- | ------------ |
| Z | Zero Flag |
| C | Carry/Borrow |
## Syscalls
| Imm | Meaning |
| --- | ------- |
| 0 | Exit Program |
| 1 | Print register A as integer |
| 2 | Print register A as ASCII char |
# Usage
```bash
cargo run -- --f <examples/filename.asc>
```
## Todo
- [x] Assembler
- [x] Lexer/Tokenizer
- [x] Add label support (supporting JMP/JZ/JNZ)
- [x] Add instructions
- [x] CMP
- [x] MUL
- [x] DIV
- [x] CALL
- [x] RET
- [x] SYS
- [ ] Better Error handling
- [ ] TUI Debugger
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