From 842629a477de1ce3234e23df20aeca0661d087ea Mon Sep 17 00:00:00 2001 From: Alex <182795204+Alex-2-Graf@users.noreply.github.com> Date: Sun, 21 Jun 2026 12:02:52 +0200 Subject: [PATCH] Update README.md --- README.md | 33 +++++++++++++++++++++------------ 1 file changed, 21 insertions(+), 12 deletions(-) diff --git a/README.md b/README.md index 772f35c..dd05148 100644 --- a/README.md +++ b/README.md @@ -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). 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. ### 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). + +![](Foto/L2_1.00.jpg) + As a result, the **"Leningrad 2 2025"** was born. The main upgrades include onboard integration of: * The **ZX_RGBI2VGA-HDMI** converter by AlexEkb. * The **AY-3-8910** sound chip. * 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: -* **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 1.02** ([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 1.01** ([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](Export/Leningrad%202%2048k%202025%201.02.pdf) / [Gerber](Gerber/Leningrad%202%2048k%202025%201.02%20GERBER.zip)) — *The latest current revision.* --- @@ -54,18 +63,18 @@ Generally, assembly and tuning are straightforward. Here is the configuration gu ## ROM & Video Configuration -* **ROM**: Detailed ROM selection guide can be found [here](https://github.com/Alex-2-Graf/LENINGRAD-2-48k). -* **VGA**: RGB2VGA converter setup instructions are available [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](VGA). --- ## Recommended Accessories -* BDI-TR-DOS -* DivMMC -* Memory Expansions and AY/TS -* LGT-Turbo-Sound-emulator -* ZX-EQ Nemo-bus Edition +* [BDI-TR-DOS](https://github.com/Alex-2-Graf/Leningrad2-BDI-TR-DOS) +* [DivMMC](https://github.com/Alex-2-Graf/Leningrad2-DivMMC) +* [Memory Expansions and AY/TS](https://github.com/Alex-2-Graf/Leningrad2-Upgrade-Kit) +* [LGT-Turbo-Sound-emulator](https://github.com/Alex-2-Graf/LGT-Turbo-Sound-emulator) +* [ZX-EQ Nemo-bus Edition](https://github.com/Alex-2-Graf/ZX-EQ) ---