The genius of the ZX Spectrum ULA was doing more with less. In a portable remake, you shouldn't copy its limitations (low-res composite, heavy power draw, heat). Instead, use an RP2040 or small FPGA to behave like a ULA while giving you modern interfaces: SPI LCD, SD card, USB, and Li-Ion power.
Map the shift keys ( CAPS SHIFT and SYMBOL SHIFT ) to ergonomic shoulder buttons. The genius of the ZX Spectrum ULA was doing more with less
| Component | Example Model | |-----------|----------------| | CPU | Z84C0020PEC (Z80, 3.3V, 20MHz) | | ULA Replacement | Raspberry Pi Pico (RP2040) | | Display | 1.8" 128x160 SPI (or 2.0" 240x240) | | Battery | 802540 1000mAh LiPo | | Charger | TP4056 + protection | | Regulator | MCP1703-3302E | | Keyboard | 40x tactile switch matrix PCB | | Speaker | 8 ohm, 1W | | SD card slot | microSD push-push | Map the shift keys ( CAPS SHIFT and
The ultimate lesson of the ZX Spectrum ULA is that limitations breed creativity. By stripping away non-essential components and forcing a single piece of silicon to multitask under strict timing constraints, Sinclair created an icon. Designing a modern portable retro computer using these exact principles bridges the gap between historical engineering and modern execution. Designing a modern portable retro computer using these
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later.
Original ULAs output raw analog YUV or composite video, which looks terrible on modern screens. For a portable design:
In 1982, Sir Clive Sinclair faced a massive engineering challenge: how to build a color microcomputer that was small, affordable, and powerful enough to compete with Commodore and Apple. The solution was the ULA, designed by Ferranti and Sinclair engineers. Combining Hundreds of Chips into One