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Piggyback 3v3

ForgottenMachines·Data-General-Nova·DG Nova CPU Tester/Piggyback 3v3/Piggyback 3v3.kicad_pcb

Piggyback 3v3 PCB layout, top view — open source RP2040/RP2350 board by ForgottenMachines

About the Piggyback 3v3 PCB

Piggyback 3v3 is an open source RP2040/RP2350 PCB design by ForgottenMachines, published on GitHub. It is a 2-layer board measuring 368.3 × 90.8 mm, with 22 components from 21 distinct parts.

Its main chip is the Pico, from the RP2040/RP2350 family. Other key parts include the 74HCT244 and 74AHC244. By type, the board carries 13 connectors, 3 ICs, 1 jumper and 1 diode.

Main components on the Piggyback 3v3

Pico74HCT24474AHC244

Piggyback 3v3 bill of materials (BOM)

22 components, 21 distinct parts.

QtyPartRefs
1
Pico
U2
1
74HCT244
U3
1
74AHC244
U4
1
MBO
J6
1
MEM
J7
1
Data Channel
J8
1
Front Panel Controls
J9
1
Programmed I/O
J10
1
CPU Option Inputs
J11
1
Data Channel
J12
1
Program Interrupt
J13
1
System Control
J14
1
CPU Option Outputs
J17
1
MEM Control Outputs
J18
1
Logic 8 CH
J19
1
Logic 8 CH
J20
2
3v3
3v1, 5vToFrontBoard1
1
MountingHole
FPIMAGE1
1
Pico 3v3 Power Out
JP1
1
Teensy4.1
Teensy 4.1
Show 1 more
QtyPartRefs
1
D_Schottky
D1

Piggyback 3v3 design files

The KiCad project lives in the ForgottenMachines/Data-General-Nova repository on GitHub; these links point at the commit this page was built from.

Piggyback 3v3: common questions

What microcontroller does the Piggyback 3v3 use?

The Piggyback 3v3 is built around the Pico, from the RP2040/RP2350 family.

How big is the Piggyback 3v3 PCB?

The Piggyback 3v3 measures 368.3 × 90.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Piggyback 3v3?

22 components, from 21 distinct parts. The full bill of materials is listed on this page.

Where can I download the Piggyback 3v3 design files?

From the ForgottenMachines/Data-General-Nova repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Piggyback 3v3 design in my own project?

The repository has no license, so all rights stay with ForgottenMachines. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Piggyback 3v3 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.

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