SVI-3x8 PicoExpander

fitch·SVI-3x8-PicoExpander·pcb/1.4.1/SVI-3x8-PicoExpander.kicad_pcb

About the SVI-3x8 PicoExpander PCB

SVI-3x8 PicoExpander is an open source RP2040/RP2350 PCB design by fitch, published on GitHub under the MIT license. It is a 2-layer board measuring 150 × 38 mm, with 14 components from 7 distinct parts.

Its main chip is the Raspberry Pi Pico 2 W, from the RP2040/RP2350 family. Other key parts include the 74LVC245A and 74HC14. By type, the board carries 5 ICs, 5 capacitors, 1 module, 1 connector, 1 switch and 1 resistor.

From the project

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.

This directory contains the KiCad hardware design files for the SVI-3x8 PicoExpander and the SuperExpander adapter board.

The main expansion board that connects to the SVI-3x8 expansion port via a 50-pin edge connector.

- KiCad project: SVI-3x8-PicoExpander.kicadpro - Schematic: SVI-3x8-PicoExpander.kicadsch - PCB layout: SVI-3x8-PicoExpander.kicadpcb - Schematics PDF:** schematics.pdf

Main components on the SVI-3x8 PicoExpander

74LVC245A 74HC14 Raspberry Pi Pico 2 W

SVI-3x8 PicoExpander bill of materials (BOM)

14 components, 7 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
4	74LVC245A	DIP-20_W7.62mm	U1, U2, U4, U5
1	74HC14	DIP-14_W7.62mm	U3
1	Raspberry Pi Pico 2 W	RaspberryPi_Pico_Common_Unspecified	A1
1	SVI-3x8 expander bus edge connector	DIP-50_EXPANDER_BUS	J1
1	Reset	SW_PUSH_1P1T_6x3.5mm_H4.3_APEM_MJTP1243	SW1
5	0.1UF 0.1μF	C_Disc_D3.0mm_W1.6mm_P2.50mm	C1, C2, C3, C4, C5
1	10K 10kΩ	R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R1

SVI-3x8 PicoExpander design files

The KiCad project lives in the fitch/SVI-3x8-PicoExpander repository on GitHub; these links point at the commit this page was built from.

SVI-3x8 PicoExpander: common questions

What microcontroller does the SVI-3x8 PicoExpander use?

The SVI-3x8 PicoExpander is built around the Raspberry Pi Pico 2 W, from the RP2040/RP2350 family.

How big is the SVI-3x8 PicoExpander PCB?

The SVI-3x8 PicoExpander measures 150 × 38 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the SVI-3x8 PicoExpander?

14 components, from 7 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the SVI-3x8 PicoExpander design files?

From the fitch/SVI-3x8-PicoExpander repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the SVI-3x8 PicoExpander design in my own project?

Yes, under the terms of its MIT license, which fitch chose for the repository.

Can I test firmware for the SVI-3x8 PicoExpander without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.