mirror of
https://github.com/Alex-2-Graf/Leningrad2-Upgrade-Kit.git
synced 2026-08-05 00:24:34 +03:00
76 lines
4.8 KiB
Markdown
76 lines
4.8 KiB
Markdown
# Leningrad2-Upgrade-Kit
|
||
|
||
## Memory Expansions and AY/TS for Leningrad-2.
|
||
|
||
> [English](README.en.md) | [Русский](README.md)
|
||
|
||
This repository contains hardware expansion board projects designed for the RAM and sound upgrade of the "Leningrad-2" home computer.
|
||
|
||
These modules allow you to upgrade the stock 48K base model to a full **128KB** or **256KB** system. This expansion is essential for running modern homebrew games, advanced demos, and heavy software.
|
||
|
||
The boards are designed with a primary goal: minimizing messy wire-wrap modifications ("spaghetti wiring"). They connect directly to the system expansion slot, transforming the basic Leningrad-2 48K into a powerhouse 128K+ class machine.
|
||
|
||
***
|
||
|
||
## 🎸 All-in-One Module Features
|
||
|
||
* **Memory:** Upgrade to 128KB (Standard Spectrum 128 mapping) or 256KB using classic DRAM chips.
|
||
* **Sound:** Integrated AY-3-8910 sound chip (or YM2149F equivalent).
|
||
* **Turbo Sound (Optional):** Supports dual AY/YM chips to achieve full 6-channel Turbo Sound capabilities.
|
||
* **Beep Mixer:** The standard motherboard Beeper signal is mixed directly into the main audio channel output.
|
||
* **Circuitry:** Standard port decoding logic (`#7FFD` for memory paging and `#BFFD`/`#FFFD` for sound chip registers).
|
||
* **Compatibility:** Full support for games and demos requiring official memory bank switching.
|
||
|
||
***
|
||
|
||
## 🧩 Hardware Construction & Connection (Bus Through-Port)
|
||
|
||
The upgrade boards feature a **Bus Through-port** design. They plug directly into the main system connector of the Leningrad-2, while providing an identical expansion slot connector on top.
|
||
|
||
* **Plug-and-Play:** This allows you to stack other peripherals—like BDI (TR-DOS) or DivMMC controllers—directly on top of this expansion board without using flat ribbon cables.
|
||
* **Motherboard Integration:** Optimized for seamless operation with my custom version of the [Leningrad-2-48k](https://github.com/Alex-2-Graf/LENINGRAD-2-48k).
|
||
* **Universal Compatibility:** The board can also be wired to any standard vintage or third-party version of the Leningrad-2. In this case, you will only need to manually route a few core control signals according to the provided schematic.
|
||
|
||
***
|
||
|
||
## 📦 Modular RAM Replacement (RAM Plug-in Board)
|
||
|
||
As an alternative to chip stacking ("piggybacking"), this project includes a specialized adapter PCB that holds 16x KR565RU5 (КР565РУ5 / 4164) DRAM chips to replace the stock computer memory.
|
||
|
||
* **Installation:** The adapter plugs directly into the original RAM IC sockets (or footprints) on the Leningrad-2 motherboard.
|
||
* **Universal Fit:** The pin group layout completely matches the original RU5 memory chip placement found across all known Leningrad-2 PCB revisions.
|
||
* **Key Advantage:** No messy chip stacking. It provides a clean install, a reliable contact interface, and superior cooling/ventilation for the RAM chips.
|
||
* **Solderless Upgrade:** Equipped with thin male pin headers (PLS-type) that slide perfectly into standard round-hole machined IC sockets on the mainboard. It preserves the clean, aesthetics and long-term hardware reliability.
|
||
|
||
---
|
||
|
||
## 🛠️ Project Modules
|
||
|
||
### 1. Leningrad 2 Expansion 128k & AY-3-8910 (YM2149F)
|
||
* [Schematics](Ext%20AY%20128k/Leningrad%202%20Ext%20AY%20128k.pdf) | [Placement](Ext%20AY%20128k/Leningrad%202%20Ext%20AY%20128k.html) | [Gerber Files](Ext%20AY%20128k/Leningrad%202%20Ext%20AY%20128k%20gerber.zip)
|
||
|
||
### 2. Leningrad 2 Expansion 128k & Turbo Sound 2x YM2149F (AY-3-8910)
|
||
* [Schematics](Ext%20TS%20128k/Leningrad%202%20Ext%20TS%20128k.pdf) | [Placement](Ext%20TS%20128k/Leningrad%202%20Ext%20TS%20128k.html) | [Gerber Files](Ext%20TS%20128k/Leningrad%202%20Ext%20TS%20128k%20Gerber.zip)
|
||
|
||
### 3. Leningrad 2 Expansion 256k & Turbo Sound 2x YM2149F (AY-3-8910)
|
||
* [Schematics](Ext%20TS%20256k/Leningrad%202%20Ext%20TS%20256k.pdf) | [Placement](Ext%20TS%20256k/Leningrad%202%20Ext%20TS%20256k.html) | [Gerber Files](Ext%20TS%20256k/Leningrad%202%20Ext%20TS%20256k%20Gerber.zip)
|
||
|
||
### 4. RAM Plug-in Board 2x64
|
||
* [Schematics](RAM%202x64/Leningrad%202%20RAM%202x64.pdf) | [Placement](RAM%202x64/Leningrad%202%20RAM%202x64.html) | [Gerber Files](RAM%202x64/L2\_RAM\_128k\_gerber.zip)
|
||
|
||
---
|
||
|
||
## 🔧 Mainboard Preparation
|
||
|
||
* **For my custom [Leningrad-2-48k](https://github.com/Alex-2-Graf/LENINGRAD-2-48k) revision:** Preparation is as simple as configuring the onboard jumpers **JP5 to JP11** (clearly labeled on the PCB silkscreen).
|
||
* **For stock/vintage motherboards:** Please consult the descriptive documentation and schematics provided in this repository to properly tap the missing address lines. [here](Mod%20128k/README.md)
|
||
|
||
---
|
||
|
||
## 💾 Memory Testing Software
|
||
|
||
To verify your new memory configuration, you can use the following diagnostic tools included in the repository:
|
||
|
||
*[GTEST](Mod%20128k/GTEST1_0.ZIP)
|
||
*[HFT](Mod%20128k/HFT1_02.ZIP)
|