diff --git a/README.md b/README.md index 0b7a8a0..d7ade0e 100644 --- a/README.md +++ b/README.md @@ -4,32 +4,34 @@ > [English](README.md) | [Русский](README.ru.md) -Following the successful launch of the Leningrad-2-48k project and incorporating community feedback, this version transitions from dynamic RAM (DRAM) to static RAM (SRAM). +Following the successful launch of the [Leningrad-2-48k](https://github.com/Alex-2-Graf/LENINGRAD-2-48k) project and incorporating community feedback, this version transitions from dynamic RAM (DRAM) to static RAM (SRAM). This architectural shift required a significant redesign of the memory management unit. As a direct benefit, the system memory has been expanded to 128K directly on the mainboard without requiring any external expansion daughterboards. Additionally, the freed-up PCB space allowed the integration of two YM2149F sound chips, providing "out-of-the-box" Turbo Sound support (by NedoPC). An IORQ arbiter was also added to the schematic. The final result of these upgrades is the **"Leningrad 2 NEXT 128K + TS 2025"** motherboard. Following hardware assembly, testing, and minor debugging, the project was officially given a new name by close friends: **"Aurora"**. - + +![](Foto/L2_2.01.jpg) + *** ### Revisions & Hardware Modules #### Mainboard Revisions -* **Revision 2.01** ([Schematics](https://github.com/Alex-2-Graf/Leningrad-2-128k-SRAM) / [Gerber](https://github.com/Alex-2-Graf/Leningrad-2-128k-SRAM)) — *Initial release. Features a humorous design note: at the urgent request of the PCB manufacturer, the board text was changed from "Made in..." to "Designed in..." ;)* -* **Revision 2.02** ([Schematics](https://github.com/Alex-2-Graf/Leningrad-2-128k-SRAM) / [Gerber](https://github.com/Alex-2-Graf/Leningrad-2-128k-SRAM)) — *The latest stable revision. Adds a power LED indicator and fixes the joystick port routing.* +* **Revision 2.01** ([Schematics](Export/Leningrad%202%20128k%20SRAM%202.01%202025.pdf) / [Gerber](Gerber/Leningrad%202%20128k%20SRAM%202.01%202025%20gerber%20made%20in%20Italy.zip)) — *Initial release. Features a humorous design note: at the urgent request of the PCB manufacturer, the board text was changed from "Made in..." to "Designed in..." ;)* +* **Revision 2.02** ([Schematics](Export/Leningrad%202%20128k%20SRAM%202.02%202025.pdf) / [Gerber](Gerber/Leningrad%202%20128k%20SRAM%202.02%202025%20Gerber.zip)) — *The latest stable revision. Adds a power LED indicator and fixes the joystick port routing.* #### Bus Adapters & Expansion Boards -* **Nemo-bus and ZX-bus Adapter** ([Gerber](https://github.com/Alex-2-Graf/Leningrad-2-128k-SRAM)) — *Differs from the previous project version by routing the `/IORQ-GE` signal directly to its intended destination. On older Revision 1 adapters, `/IORQ-GE` went to pin A19 (+beta); it now routes to pin A17. To upgrade a Rev 1 adapter to Rev 2 specs, simply cut the trace going to A19 and solder a jumper wire to A17.* -* **"Yolka" (3x Nemo-bus & 1x ZX-bus) Slot Expansion Board** ([Schematics](https://github.com/Alex-2-Graf/Leningrad-2-128k-SRAM) / [Gerber](https://github.com/Alex-2-Graf/Leningrad-2-128k-SRAM)) — *An expansion backplane made possible by the new onboard hardware arbiter.* -* **Upgraded Slot Expansion Board** ([Schematics](https://github.com/Alex-2-Graf/Leningrad-2-128k-SRAM) / [Gerber](https://github.com/Alex-2-Graf/Leningrad-2-128k-SRAM)) — *A redesigned backplane where the ZX-bus connector is replaced with a standard Leningrad-2 edge connector. It also adds a dedicated +5V/+12V power input molex. Vintage ZX-bus cards can still be connected here using adapters ([First](https://github.com/Alex-2-Graf/Leningrad-2-128k-SRAM) / [Second](https://github.com/Alex-2-Graf/Leningrad-2-128k-SRAM)).* +* **Nemo-bus and ZX-bus Adapter** ([Gerber](Gerber/L2_NS_Rev_1_1_Gerber.zip)) — *Differs from the previous project version by routing the `/IORQ-GE` signal directly to its intended destination. On older Revision 1 adapters, `/IORQ-GE` went to pin A19 (+beta); it now routes to pin A17. To upgrade a Rev 1 adapter to Rev 2 specs, simply cut the trace going to A19 and solder a jumper wire to A17.* +* **"Yolka" (3x Nemo-bus & 1x ZX-bus) Slot Expansion Board** ([Schematics](Export/Back_L2_Nemo_x3_Spec_Ver2.1.pdf) / [Gerber](Gerber/Back_L2_Nemo_x3_Spec_Ver2.1_gerber.zip)) — *An expansion backplane made possible by the new onboard hardware arbiter.* +* **Upgraded Slot Expansion Board** ([Schematics](Export/Back_L2_Nemo_x3_L2.pdf) / [Gerber](Gerber/Back_L2_Nemo_x3_L2_gerber.zip)) — *A redesigned backplane where the ZX-bus connector is replaced with a standard Leningrad-2 edge connector. It also adds a dedicated +5V/+12V power input molex. Vintage ZX-bus cards can still be connected here using adapters ([First](Gerber/Nemo2ZX_BUS_v1.zip) / [Second](Gerber/Nemo2ZX_BUS_v2.zip)).* #### Keyboard PCB Options Two mechanical keyboard variants were designed for different mounting styles: -1. **Chassis Mounted:** Designed to fit directly into a computer case ([Gerber](https://github.com/Alex-2-Graf/Leningrad-2-128k-SRAM)). -2. **Sandwich / Double-Decker Mounted:** Designed to stack directly on top of the mainboard ([Gerber](https://github.com/Alex-2-Graf/Leningrad-2-128k-SRAM)). -* **Mechanical Switch Support:** Dedicated PCB layouts have been added for **ReDragon-MX-ZT02** ([Gerber](https://github.com/Alex-2-Graf/Leningrad-2-128k-SRAM)) and **ReDragon_Slim_ZT04** ([Gerber](https://github.com/Alex-2-Graf/Leningrad-2-128k-SRAM)) switches. +1. **Chassis Mounted:** Designed to fit directly into a computer case ([Gerber](hGerber/ZX-Keyboard_Gerber.zip)). +2. **Sandwich / Double-Decker Mounted:** Designed to stack directly on top of the mainboard ([Gerber](Gerber/L2-40Key_gerber.zip)). +* **Mechanical Switch Support:** Dedicated PCB layouts have been added for **ReDragon-MX-ZT02** ([Gerber](Gerber/L2-40Key-slim-GERBER.zip)) and **ReDragon_Slim_ZT04** ([Gerber](Gerber/ZX-40Key-slim-Gerber.zip)) switches. *** @@ -45,17 +47,17 @@ In general, hardware assembly and tuning are straightforward. The functions of t ## ROM & Video Configuration -* **ROM**: Detailed EPROM files and configuration info can be found [here](https://github.com/Alex-2-Graf/Leningrad-2-128k-SRAM). -* **VGA**: Firmware and instructions for the RP2040-Zero converter are available [here](https://github.com/Alex-2-Graf/Leningrad-2-128k-SRAM). +* **ROM**: Detailed EPROM files and configuration info can be found [here](ROM). +* **VGA**: Firmware and instructions for the RP2040-Zero converter are available [here](VGA). --- ## Recommended Accessories -* BDI-TR-DOS -* DivMMC -* 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) +* [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) ---