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