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+# VG93-MB8877-lgt8f328p-emulator
+
+## Hardware layout for Evgeny Ugryumov's WD1793/MB8877/KR1818VG93 floppy disk controller emulator based on the LGT8F328P MCU.
+
+> [English](README.en.md) | [Русский](README.md) 
+
+This project features a hardware emulator for the Soviet KR1818VG93 (КР1818ВГ93) floppy disk controller chip and its international equivalents, the **Western Digital WD1793** and **Fujitsu MB8877**. Powered by the fast and affordable **LGT8F328P** microcontroller, this adapter board acts as a direct drop-in replacement. It is designed to replace scarce, expensive, or faulty vintage FDC chips in retro-computers like the ZX Spectrum and other compatible 8-bit systems.
+
+*   **Firmware Development:** Evgeny Ugryumov (ZX-FLOPPY group).
+*   **PCB Layout & Hardware Design:** [Alex-2-Graf](https://github.com/Alex-2-Graf).
+
+The adapter board is routed specifically to plug directly into a standard 40-pin IC socket on the host computer board, requiring no permanent modifications to the vintage hardware.
+
+***
+
+## ⚡ Key Features of LGT8F328P
+
+*   **32 MHz Clock Speed:** Provides high-precision bus timing synchronization to accurately match vintage hardware cycles.
+*   **High Performance Core:** Executes most machine instructions in a single clock cycle.
+*   **Native 5V Logic:** Provides full signal level compatibility with legacy 8-bit computers without requiring logic level shifters or resistors.
+*   **Cost-Effective:** The LGT8F328P microcontroller is significantly more affordable and accessible than surviving original WD1793/VG93 silicon chips.
+
+## 🛠️ Supported Functionality
+
+*   Emulation of core FDC commands for sector reading and writing.
+*   Accurate tracking of stepper motor control signals (`STEP`, `DIR`).
+*   Precise hardware emulation of standard drive feedback signals: `READY`, `INDEX`, and `TRACK 00`.
+
+***
+
+## 🔌 Hardware Revisions
+
+The emulator has evolved through three distinct board layouts:
+
+### Revision 1 (Not recommended for new builds)
+The initial prototype version. Included for historical log purposes.
+*   [Schematics](Export/ВГ93-LGT_v1.1.pdf) | [Placement](Export/ВГ93-LGT_v1.1.html) | [Gerber](Gerber/VG93-LGT_1.1_GERBER.zip)
+
+### Revision 2 (Diode-based version)
+An improved layout utilizing discrete steering diodes to condition signals.
+*   [Schematics](Export/ВГ93-LGT_v1.2.pdf) | [Placement](Export/ВГ93-LGT_v1.2.html) | [Gerber](Gerber/VG93-LGT_1.2_GERBER.zip)
+
+### Revision 3 (74AHC1G08 logic version - Recommended)
+The latest and most stable layout utilizing a tiny 74AHC1G08 AND-gate chip. Since this logic IC comes in two common SMD packages, two distinct PCB options are available:
+1.  **Ultra-compact layout** using the **SC-70** IC package package:
+    *   [Schematics](Export/ВГ93-LGT_v1.3.pdf) | [Placement](hExport/ВГ93-LGT_v1.3.html) | [Gerber](Gerber/VG93-LGT_1.3_SC-70_GERBER.zipr)
+2.  **Standard layout** using the **SOT-23-5** IC package package:
+    *   [Schematics](Export/ВГ93-LGT_v1.3.pdf) | [Placement](Export/ВГ93-LGT_v1.3.html) | [Gerber](Gerber/VG93-LGT_1.3r_SOT-23-5_GERBER.zip)
+
+***
+
+## 💾 Flashing Instructions
+
+To flash the compiled firmware onto the onboard LGT8F328P microcontroller, a specialized ISP programmer is required. 
+
+You can assemble your own programmer using one of these DIY options:
+1.  An **Arduino-based** programmer using [LarduinoISP](Programmer/LarduinoISP.zip).
+2.  An **RP2040-based** programmer using [LarduinoISP](Programmer/RP2040_HRDY_LarduinoISP_Prog.zip).
+
+Once your hardware programmer is verified, flash the precompiled binary `.hex` files using the **[AVRDUDESS](Programmer/AVRDUDESS-2.18-portable.zip)** GUI software tool.
+
+*   **Firmware Binaries:** Available inside the [/Firmware](Firmware) directory.
+*   **Latest Releases:** Updated software drops can be monitored directly in the **[ZX-FLOPPY](https://t.me/zx_floppy)** community group.
+*   **Source Material:** Complete design files can be inspected in the [/Sources](Sources) folder.
+
+### ⚠️ Interface Modification (Nemo-BDI Correction)
+For Beta Disk Interfaces utilizing the **Nemo-BDI** standard architecture, an external hardware patch is required to correct the chip select (`CS`) signal timing. This modification requires a standard **555LA3 / 74LS00** discrete NAND logic gate chip.
+*   [Modification Schematic](Sources/CS_correction.PDF)
+
+***
+
+## 👥 Credits & Acknowledgments
+
+*   **Evgeny Ugryumov** — Special thanks for his incredible work developing the firmware core inside the **ZX-FLOPPY** project.
+*   **Alexander (UR4QBP)** — For running extensive hardware testing, experiments, and optimizations.
+*   **HRDY (Dmitry)** — For developing the excellent RP2040-based hardware programmer design.
+
+***
+
+## 📜 License
+
+This project is distributed under the open-source MIT License. See the `LICENSE` file for more details.

README.md

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 # VG93-MB8877-lgt8f328p-emulator  
   
 Hardware layout for Evgeny Ugryumov's WD1793/MB8877/ВГ93 floppy disk controller emulator based on LGT8F328P MCU.  
-
+  
+> [English](README.en.md) | [Русский](README.md)  
+  
 ---
 
 # Эмулятор контроллера дисковода КР1818ВГ93 (MB8877/WD1793) на чипе LGT8F328P MCU