Open-source boards designed in KiCad by fitch on GitHub, from 3 repositories. A board’s address here is its repository’s there.
fitch/SVI-3x8-PicoExpander
SVI-3x8 PicoExpander project is a memory, disk and tape expansion emulator for Spectravideo 318 and 328 which uses a Raspberry Pico 2 W microcontroller board to emulate devices in the expansion bus.
fitch/SVI-328-PicoROM
The SVI-328 PicoROM project is a ROM emulator for Spectravideo 328 which uses a Raspberry Pico 2 W microcontroller board to emulate a SVI-328 game ROM cartridge.
fitch/SVI-3x8-PicoExpander
SVI-3x8 PicoExpander project is a memory, disk and tape expansion emulator for Spectravideo 318 and 328 which uses a Raspberry Pico 2 W microcontroller board to emulate devices in the expansion bus.