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Fx2 tube cartridge adapter

google·myelin-acorn-electron-hardware·fx2_tube_cartridge_adapter/pcb/fx2_tube_cartridge_adapter.kicad_pcb

Fx2 tube cartridge adapter PCB layout, top view — open source Raspberry Pi board by google

About the Fx2 tube cartridge adapter PCB

Fx2 tube cartridge adapter is an open source Raspberry Pi PCB design by google, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 66.5 × 85.5 mm, with 51 components from 19 distinct parts.

Its main chip is the Raspberry Pi Zero, from the Raspberry Pi family. Other key parts include the MCP1700T-3302E/MB. By type, the board carries 6 resistors, 5 capacitors, 1 IC and 1 diode.

It belongs with the retro computing and usb & debug tools designs in this gallery.

From the project

Phillip Pearson's retro hardware projects for the Acorn Electron

FX2 Tube/Cartridge Adapter ==========================

An adapter board to make it easy to monitor your Electron, BBC Micro, or BBC Master's bus using a cheap logic analyzer. It also functions as an adapter for PiTubeDirect.

On the Electron, it plugs into a cartridge slot on the Plus 1. It can monitor the bus when an FX2 board is connected, and when a Raspberry Pi running PiTubeDirect is attached, it will perform voltage conversion, clean up the clock, and generate the /TUBE signal required. You'll still need to have a Tube client ROM installed; most filing systems (including MMFS) provide…

Fx2 tube cartridge adapter, from the project README
From the project README

Main components on the Fx2 tube cartridge adapter

MCP1700T-3302E/MB

Fx2 tube cartridge adapter bill of materials (BOM)

51 components, 19 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
MCP1700T-3302E/MB
U1
1
lcsoft mini
FX2
1
Power from FX2
FX2PWR
1
jtag
JTAG1
1
Raspberry Pi Zero
PI1
1
XC9572XL
PL1
1
Pi Serial
SERIAL1
32
—
staple_single1, staple_single2, staple_single3, staple_single4, staple_single5, staple_single6, staple_single7, staple_single8 +24
1
BAT54
D1
2
C28323
100n
C1, C2
1
C49678
1u
C3
1
C49678
1u
C4
1
C28323
1u
C5
1
C17414
1k
R1
1
C17513
1k
R2
1
C17630
1k
R3
1
C17673
1k
R4
1
C17673
10k
R5
1
C17520
1k
R6

Fx2 tube cartridge adapter design files

The KiCad project lives in the google/myelin-acorn-electron-hardware repository on GitHub; these links point at the commit this page was built from.

Fx2 tube cartridge adapter: common questions

What microcontroller does the Fx2 tube cartridge adapter use?

The Fx2 tube cartridge adapter is built around the Raspberry Pi Zero, from the Raspberry Pi family.

How big is the Fx2 tube cartridge adapter PCB?

The Fx2 tube cartridge adapter measures 66.5 × 85.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Fx2 tube cartridge adapter?

51 components, from 19 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 Fx2 tube cartridge adapter design files?

From the google/myelin-acorn-electron-hardware repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Fx2 tube cartridge adapter design in my own project?

Yes, under the terms of its Apache-2.0 license, which google chose for the repository.

Can I test firmware for the Fx2 tube cartridge adapter without the hardware?

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

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