Sizif-512 is a ZX Spectrum 48+/128/+2/+3 clone with SD card support, esxDOS, a joystick port, and more. It uses a real (non-emulated) Z80 processor, an AY-3-8910 sound chip, and a programmable CPLD as the ULA. Sizif-512 is a modern version of the Harlequin 128 project and the motherboard for the ZX Spectrum Neo computer.
This kit includes a DIY PCB with the most challenging SMD components pre-soldered and programmed. This saves you from soldering difficult chips or needing programmers for them. Assembly simply involves purchasing and soldering the remaining parts.
- CPLD Altera EPM1270T144 – soldered and programmed
- SN74CB3T3245PW buffers
- SST39SF040 – programmed
Sizif-512 project page with documentation: https://github.com/UzixLS/zx-sizif-512
More about Sizif-512 and ZX Spectrum Neo: https://mumio.dev/zx-spectrum-neo/

![_original_Plyta-PCB-Sizif-512-z-wlutowana-i-zaprogramowana-Altera_[360]_0c20274c9e34 Sizif-512 DIY - PCB with Altera + ROM](https://mumio.dev/wp-content/uploads/2026/01/original_Plyta-PCB-Sizif-512-z-wlutowana-i-zaprogramowana-Altera_360_0c20274c9e34-600x450.jpg)
![_original_Board-PCB-Sizif-512-with-soldered-and-programmed-Altera_[361]_0c20274c9e34 Sizif-512 DIY - PCB with Altera + ROM](https://mumio.dev/wp-content/uploads/2026/01/original_Plyta-PCB-Sizif-512-z-wlutowana-i-zaprogramowana-Altera_361_0c20274c9e34-1-600x400.jpg)
![_original_Sizif-512-DIY-kit-1-board-with-soldered-and-programmed-Altera_[365]_0c20274c9e34 Sizif-512 DIY - PCB with Altera + ROM](https://mumio.dev/wp-content/uploads/2026/01/original_Sizif-512-DIY-zestaw-1-plyta-z-wlutowana-i-zaprogramowana-Altera_365_0c20274c9e34-1-600x450.jpg)
![_original_Board-PCB-Sizif-512-with-soldered-and-programmed-Altera_[362]_0c20274c9e34 Sizif-512 DIY - PCB with Altera + ROM](https://mumio.dev/wp-content/uploads/2026/01/original_Plyta-PCB-Sizif-512-z-wlutowana-i-zaprogramowana-Altera_362_0c20274c9e34-1-600x471.jpg)
![_original_Plyta-PCB-Sizif-512-z-wlutowana-i-zaprogramowana-Altera_[360]_0c20274c9e34 Sizif-512 DIY - PCB with Altera + ROM](https://mumio.dev/wp-content/uploads/2026/01/original_Plyta-PCB-Sizif-512-z-wlutowana-i-zaprogramowana-Altera_360_0c20274c9e34-100x100.jpg)
![_original_Board-PCB-Sizif-512-with-soldered-and-programmed-Altera_[361]_0c20274c9e34 Sizif-512 DIY - PCB with Altera + ROM](https://mumio.dev/wp-content/uploads/2026/01/original_Plyta-PCB-Sizif-512-z-wlutowana-i-zaprogramowana-Altera_361_0c20274c9e34-1-100x100.jpg)
![_original_Sizif-512-DIY-kit-1-board-with-soldered-and-programmed-Altera_[365]_0c20274c9e34 Sizif-512 DIY - PCB with Altera + ROM](https://mumio.dev/wp-content/uploads/2026/01/original_Sizif-512-DIY-zestaw-1-plyta-z-wlutowana-i-zaprogramowana-Altera_365_0c20274c9e34-1-100x100.jpg)
![_original_Board-PCB-Sizif-512-with-soldered-and-programmed-Altera_[362]_0c20274c9e34 Sizif-512 DIY - PCB with Altera + ROM](https://mumio.dev/wp-content/uploads/2026/01/original_Plyta-PCB-Sizif-512-z-wlutowana-i-zaprogramowana-Altera_362_0c20274c9e34-1-100x100.jpg)

![_original_USLUGA-wyciecia-obudowy-pod-Sizif-512_[383]_0c20274c9e34 CASE CUT-OUT SERVICE for Sizif-512](https://mumio.dev/wp-content/uploads/2026/01/original_USLUGA-wyciecia-obudowy-pod-Sizif-512_383_0c20274c9e34-300x300.jpg)
![_original_Sizif-512-DIY-zestaw-2-wszystkie-czesci_[414]_0c20274c9e34 ZX Spectrum Sizif-512 LARGE DIY - parts + case](https://mumio.dev/wp-content/uploads/2026/01/original_Sizif-512-DIY-zestaw-2-wszystkie-czesci_414_0c20274c9e34-300x300.jpg)
![_original_Sizif-512-zlozony-uruchomiony-i-przetestowany_[452]_0c20274c9e34 Sizif-512 - Assembled, Initialized, and Tested](https://mumio.dev/wp-content/uploads/2026/01/original_Sizif-512-zlozony-uruchomiony-i-przetestowany_452_0c20274c9e34-300x300.jpg)
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