Alex-2-Graf/LENINGRAD-2-48k
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@ -17,24 +17,33 @@ Along with its predecessor, "Leningrad-2" became one of the most widespread ZX S
After building a "Radio 86RK" and an Odessa-designed clone (sadly, the schematics for the latter are lost), I decided to assemble the "Leningrad-2". Just a month later, I expanded it to 128K and added a Beta Disk Interface (BDI). After building a "Radio 86RK" and an Odessa-designed clone (sadly, the schematics for the latter are lost), I decided to assemble the "Leningrad-2". Just a month later, I expanded it to 128K and added a Beta Disk Interface (BDI).
To afford two 5.25-inch floppy drives, I spent the summer of 1990 working with a student construction brigade. This computer served me faithfully throughout my entire university years. It handled countless complex calculations, traveled to many places — including the Chernobyl Nuclear Power Plant (ChNPP) — and remains fully functional to this day. To afford two 5.25-inch floppy drives, I spent the summer of 1990 working with a student construction brigade. This computer served me faithfully throughout my entire university years. It handled countless complex calculations, traveled to many places — including the Chernobyl Nuclear Power Plant (ChNPP) — and remains fully functional to this day.
![](Foto/%D0%9F%D1%80%D0%B0%D0%B4%D0%B5%D0%B4%D1%83%D1%88%D0%BA%D0%B0-1990.jpg)
The original "great-grandfather" board will soon be housed in a brand-new case. The original "great-grandfather" board will soon be housed in a brand-new case.
### Leningrad-2 2025 Revision ### Leningrad-2 2025 Revision
In 2025, I decided to redesign the PCB to match modern realities. I wanted to build in expansion capabilities right from the start, avoiding any future track-cutting or messy wire-wrap modifications (MGTF wire). In 2025, I decided to redesign the PCB to match modern realities. I wanted to build in expansion capabilities right from the start, avoiding any future track-cutting or messy wire-wrap modifications (MGTF wire).
![](Foto/L2_1.00.jpg)
As a result, the **"Leningrad 2 2025"** was born. The main upgrades include onboard integration of: As a result, the **"Leningrad 2 2025"** was born. The main upgrades include onboard integration of:
* The **ZX_RGBI2VGA-HDMI** converter by AlexEkb. * The **ZX_RGBI2VGA-HDMI** converter by AlexEkb.
* The **AY-3-8910** sound chip. * The **AY-3-8910** sound chip.
* Minor improvements for future expansions. * Minor improvements for future expansions.
Alongside this, I designed a Gerber adapter for Nemo-bus and ZX-bus. This allows the connection of various expansion cards, such as the Cosmo Card by Igor ZXKM. Alongside this, I designed a Gerber adapter for Nemo-bus and ZX-bus. This allows the connection of various expansion cards, such as the Cosmo Card by Igor ZXKM.
![](Foto/Back_L2_Nemo_Spec.jpg)
![](Foto/L2_1.00%2BKK.jpg)
The results completely met expectations. Following real-world testing and minor cosmetic tweaks, I released a few revisions: The results completely met expectations. Following real-world testing and minor cosmetic tweaks, I released a few revisions:
* **Revision 1.01** ([Schematics](https://github.com/Alex-2-Graf/LENINGRAD-2-48k) / [Gerber](https://github.com/Alex-2-Graf/LENINGRAD-2-48k)) — *Initial release. No bugs found, but updated based on community feedback.* * **Revision 1.01** ([Schematics](Export/Leningrad%202%2048k%202025%201.01.pdf) / [Gerber](Gerber/Leningrad%202%2048k%202025%201.01%20GERBER.zip)) — *Initial release. No bugs found, but updated based on community feedback.*
* **Revision 1.02** ([Schematics](https://github.com/Alex-2-Graf/LENINGRAD-2-48k) / [Gerber](https://github.com/Alex-2-Graf/LENINGRAD-2-48k)) — *The latest current revision.* * **Revision 1.02** ([Schematics](Export/Leningrad%202%2048k%202025%201.02.pdf) / [Gerber](Gerber/Leningrad%202%2048k%202025%201.02%20GERBER.zip)) — *The latest current revision.*
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@ -54,18 +63,18 @@ Generally, assembly and tuning are straightforward. Here is the configuration gu
## ROM & Video Configuration ## ROM & Video Configuration
* **ROM**: Detailed ROM selection guide can be found [here](https://github.com/Alex-2-Graf/LENINGRAD-2-48k). * **ROM**: Detailed ROM selection guide can be found [here](ROM).
* **VGA**: RGB2VGA converter setup instructions are available [here](https://github.com/Alex-2-Graf/LENINGRAD-2-48k). * **VGA**: RGB2VGA converter setup instructions are available [here](VGA).
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## Recommended Accessories ## Recommended Accessories
* BDI-TR-DOS * [BDI-TR-DOS](https://github.com/Alex-2-Graf/Leningrad2-BDI-TR-DOS)
* DivMMC * [DivMMC](https://github.com/Alex-2-Graf/Leningrad2-DivMMC)
* Memory Expansions and AY/TS * [Memory Expansions and AY/TS](https://github.com/Alex-2-Graf/Leningrad2-Upgrade-Kit)
* LGT-Turbo-Sound-emulator * [LGT-Turbo-Sound-emulator](https://github.com/Alex-2-Graf/LGT-Turbo-Sound-emulator)
* ZX-EQ Nemo-bus Edition * [ZX-EQ Nemo-bus Edition](https://github.com/Alex-2-Graf/ZX-EQ)
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