Alex-2-Graf/ZX-Spectrum-BDI-TR-DOS-interface
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@ -21,13 +21,13 @@ The project is available in two structural options depending on your custom encl
* The circuitry is split across two separate stacked PCBs to facilitate clean routing of large through-hole (DIP) components.
* The perfect choice for vintage enthusiasts who prefer simple, spacious home soldering.
* Features a standard male Spectrum expansion Edge connector pass-through.
* **Bottom Board:** [Schematics](https://github.com/Alex-2-Graf/ZX-Spectrum-BDI-TR-DOS-interface) | [Placement](https://github.com/Alex-2-Graf/ZX-Spectrum-BDI-TR-DOS-interface) | [Gerber](https://github.com/Alex-2-Graf/ZX-Spectrum-BDI-TR-DOS-interface)
* **Top Board:** [Schematics](https://github.com/Alex-2-Graf/ZX-Spectrum-BDI-TR-DOS-interface) | [Placement](https://github.com/Alex-2-Graf/ZX-Spectrum-BDI-TR-DOS-interface) | [Gerber](https://github.com/Alex-2-Graf/ZX-Spectrum-BDI-TR-DOS-interface)
* **Bottom Board:** [Schematics](Export/ZX%20BDI%202%20PCB%20Lower.pdf) | [Placement](Export/ZX%20BDI%202%20PCB%20Lower.html) | [Gerber](Gerber/ZX_BDI_2_PCB_Lower_Gerbers.zip)
* **Top Board:** [Schematics](Export/ZX%20BDI%202%20PCB%20Upper.pdf) | [Placement](Export/ZX%20BDI%202%20PCB%20Upper.html) | [Gerber](Gerber/ZX_BDI_2_PCB_Upper_Gerbers.zip)
### 2. Compact Single (Single-Board Layout)
* A modern, dense layout with all components tightly grouped onto a single printed circuit board.
* Features minimal dimensions, looking very neat and compact when plugged straight into the computer's back edge expansion port.
* [Schematics](https://github.com/Alex-2-Graf/ZX-Spectrum-BDI-TR-DOS-interface) | [Placement](https://github.com/Alex-2-Graf/ZX-Spectrum-BDI-TR-DOS-interface) | [Gerber](https://github.com/Alex-2-Graf/ZX-Spectrum-BDI-TR-DOS-interface)
* [Schematics](Export/ZX%20BDI%201%20PCB.pdf) | [Placement](Export/ZX%20BDI%201%20PCB.html) | [Gerber](Gerber/ZX_BDI_TR_DOS_Grbers.zip)
***
@ -39,14 +39,14 @@ The project is available in two structural options depending on your custom encl
⚠️ **ATTENTION:** It is highly recommended to strictly use the **MB8877** chip (or its direct 5V CMOS equivalents). Attempting to drop in a classic Soviet КР1818ВГ93 or Western Digital WD1793 chip without manually rerouting the power circuits to supply +12V **will instantly destroy the vintage FDC integrated circuit**.
*Note: You can also use my DIY hardware LGT8F328P-based FDC chip emulator instead of a physical 40-pin IC.*
*Note: You can also use my DIY hardware LGT8F328P-based FDC chip emulator instead of a physical 40-pin IC.* [VG93/MB8877/WD1793](https://github.com/Alex-2-Graf/VG93-MB8877-lgt8f328p-emulator)
***
## ⚙ Hardware Configuration Controls
### DIP Switch (TR-DOS Version Selection)
The board features an onboard DIP switch block that allows you to easily multi-boot between four different pre-flashed TR-DOS system firmware versions. Detailed configurations can be inspected [here](https://github.com/Alex-2-Graf/ZX-Spectrum-BDI-TR-DOS-interface).
The board features an onboard DIP switch block that allows you to easily multi-boot between four different pre-flashed TR-DOS system firmware versions. Detailed configurations can be inspected [here](ROM).
### ON/OFF Toggle Switch (TR-DOS Shadow ROM Management)
The hardware toggle switch manages the physical mapping logic of the TR-DOS shadow ROM. This toggle is essential to prevent system memory banking conflicts across different computer mainboard models: