hence/README.md

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2023-03-24 20:35:06 +00:00
# hence
2023-04-04 12:07:21 +00:00
Virtual CPU with Assembler and Emulator and Forth compiler included.
2023-03-24 20:35:06 +00:00
## Architecture
### Memory mapping
| Start | End | Name | Description |
| -------- | -------- | --------------- | ------------------------------------------------------------ |
| `0x0000` | `0x8000` | `PRG` (Program) | ROM of program binary |
| `0x8000` | `0x9fff` | `ST` (Stack) | RAM used as stack |
| `0xa000` | `0xbfff` | `MEM` (Memory) | Generic RAM |
| `0xc000` | | `OUT` (Out) | Writes value as decimal number to standard output when trying to be overwritten |
| `0xc001` | | `CHR` (Char) | Writes value as UTF-8 char to standard output when trying to be overwritten |
| `0xc002` | | `KEY` (Key) | Waits for key press and returns UTF-8 value of it when trying to be read from |
### Registers
| Hex | Name | Description |
| ----- | ---------------------- | ------------------------------ |
| `0x1` | `PC` (Program counter) | Address of current instruction |
| `0x2` | `OPC` | Opcode of current instruction |
| | | |
***TODO***