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+# PicoCalc SD
+
+This repository contains the official factory image and files for the **PicoCalc SD card**. It includes essential firmware, applications, and system files required for the proper functioning of **PicoCalc**.
+
+## Directory Overview
+
+```
+├── bifdiag.bas
+├── Chessnovice_johnybot.nes
+├── firmware
+│   ├── PicoCalc_Fuzix_v1.0.img
+│   ├── PicoCalc_Fuzix_v1.0.uf2
+│   ├── PicoCalc_MP3Player_v0.5.uf2
+│   ├── PicoCalc_NES_v1.0.uf2
+│   ├── PicoCalc_PicoMite_v1.0.uf2
+│   ├── PicoCalc_stm32 #PicoCalc keyboard firmware
+│   │   ├── PicoCalc_firmware_v1.0.bin
+│   │   └── PicoCalc_firmware_v1.0.hex
+│   └── PicoCalc_uLisp_v1.0.uf2
+├── lorenz.bas
+├── mand.bas
+├── picocalc.bmp
+└── README.md
+
+```
+
+## Flashing the Factory SD Image
+
+To restore your **PicoCalc SD card** to its factory state, follow these steps:
+
+### Requirements:
+- A microSD card (at least **16GB** recommended)
+- A computer with **Linux/macOS/Windows**
+- A microSD card reader
+
+## Custom Partitioning
+
+The **PicoCalc SD card** uses a dual-partition structure:
+
+| Partition | Size    | Format | Purpose |
+|-----------|--------|--------|---------|
+| `/dev/sdX1` | Remaining space | **FAT32** | Storage for PicoMite, uLisp, NES Emulator, etc. |
+| `/dev/sdX2` | **32MB** | **fuzix filesystem** | Root filesystem for **FUZIX** |
+
+### Manually Partitioning an SD Card
+
+If you need to manually create an SD card for **PicoCalc**, use the provided **partitioning script**:
+
+```bash
+wget https://github.com/clockworkpi/PicoCalc/raw/refs/heads/master/Code/scripts/partition_usb_32mb.sh
+chmod +x partition_usb_32mb.sh
+sudo ./partition_usb_32mb.sh sdb
+```
+*(Replace `sdb` with your actual SD card device.)*
+
+## Notes
+- The **USB Type-C port** is the default **serial port** for **PicoCalc**, not the Micro USB port.
+- FUZIX supports a maximum **32MB** root filesystem.
+- Ensure you backup your data before modifying the SD card.
+
+---
+For more details, visit the official **[PicoCalc GitHub Repository](https://github.com/clockworkpi/PicoCalc)**.
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