In our recent meeting on March 3, 2025, members shared updates on various projects, ranging from hardware modifications to new designs.
New Combined Pico Card
Jeff Burrell introduced plans for a new combined Pico card that consolidates the Pico video and Pico storage boards into a single, larger form factor. This development is aimed at simplifying the user experience by providing a unified solution rather than managing two separate cards.
The new design will utilize a Pico2 card that offers enhanced capabilities, including:
- 8 megabytes of flash memory, significantly more than the current configuration.
- Improved processing speed and performance.
- A more efficient layout that accommodates additional features, such as an OLED display for file management.
Timex Sinclair 2068 Audio Modifications
Carl Miles shared updates on his ongoing modifications for the Timex Sinclair 2068, focusing on enhancing both audio and video output. His projects include:
- Creating a stereo audio output by replacing the existing monitor RCA jack with a custom board that allows external audio connections.
- Implementing a feature to disable the internal speaker when external audio is connected, improving user experience.
- Improving video output quality by integrating advanced circuitry for a better display experience.
ZX81/TS1000 Hardware Modifications
Carl also discussed several hardware modifications for the ZX81/TS1000. His ambitious project includes:
- Developing an internal 32K memory expansion that replaces the original RAM chip, featuring battery backup and switches to manage compatibility and functionality.
- Designing a small PCB with switches that can be installed inside the ZX81 case to control features like M1 NOT and cartridge compatibility.
3D Printing Innovations: Kilo Z Upgrade
Ingo provided insights into his recent acquisition of a QIDI 4 Plus 4 3D printer, which he has been using to create a new case for the Kilo Z. The new design incorporates several improvements:
- A VGA output option, enhancing compatibility with modern displays.
- Consideration for upgrades that do not require soldering, making it more accessible for users.
- Plans to release STL files to the community, allowing others to print their own cases and modifications.
Ingo demonstrated the size difference between the new Kilo Z case and an original ZX81, highlighting the additional space available for future expansions and upgrades.
Converting YUV to RGB for Video Quality Enhancement
The team explored the potential of converting YUV signals within the Timex Sinclair 2068 to RGB with intensity for improved video quality. This discussion included:
- Using a mini DIN connector to output composite, stereo audio, and RGB signals in one compact solution.
- Examining how intensity could be integrated to enhance the overall video experience.