Usbfloppy

cm68·usbfloppy·hardware/kicad/usbfloppy.kicad_pcb

About the Usbfloppy PCB

Usbfloppy is an open source RP2040/RP2350 PCB design by cm68, published on GitHub. It is a 2-layer board measuring 233.4 × 154.9 mm, with 11 components from 11 distinct parts.

Its main chip is the Pico 2 W, from the RP2040/RP2350 family. Other key parts include the FDC37C65C, SN74LVC245AN, SN74LVC244AN, SN7407N and SN74LS244N. By type, the board carries 6 ICs, 3 connectors and 2 crystals.

From the project

This directory is the KiCad (v7) starting point for the USB floppy interface board.

The schematic is a valid, openable KiCad 9 sheet with these components placed: U1 Pico 2 W, U2 WD37C65, U3 74LVC245, U5 7407. It loads in KiCad 9 and passes kicad-cli sch export netlist / svg (verified).

The WD37C65 symbol carries the full, verified 40-pin DIP pinout (see ../netlist.md §1/§2 and the bitsavers datasheet below). The Pico 2 W symbol is the standard 40-pin header pinout.

Main components on the Usbfloppy

Pico 2 W FDC37C65C SN74LVC245AN SN74LVC244AN SN7407N SN74LS244N

Usbfloppy bill of materials (BOM)

11 components, 11 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	Pico 2 W	RPi_Pico_SMD_TH	U1
1	FDC37C65C	PLCC-44_THT-Socket	U2
1	SN74LVC245AN 74LVC245	DIP-20_W7.62mm	U3
1	SN74LVC244AN 74LVC244	DIP-20_W7.62mm	U4
1	SN7407N 7407	DIP-14_W7.62mm	U5
1	SN74LS244N 74LS244	DIP-20_W7.62mm	U7
1	16 MHz	Oscillator_DIP-14	Y1
1	9.6 MHz	Oscillator_DIP-14	Y2
1	Floppy 5.25	IDC-Header_2x17_P2.54mm_Vertical	J1
1	Floppy 3.5	IDC-Header_2x17_P2.54mm_Vertical	J2
1	8-inch 50	IDC-Header_2x25_P2.54mm_Vertical	J3

Usbfloppy design files

The KiCad project lives in the cm68/usbfloppy repository on GitHub; these links point at the commit this page was built from.

Layouthardware/kicad/usbfloppy.kicad_pcb
Schematichardware/kicad/usbfloppy.kicad_sch
BOMhardware/bom.csv

Usbfloppy: common questions

What microcontroller does the Usbfloppy use?

The Usbfloppy is built around the Pico 2 W, from the RP2040/RP2350 family.

How big is the Usbfloppy PCB?

The Usbfloppy measures 233.4 × 154.9 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Usbfloppy?

11 components, from 11 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 Usbfloppy design files?

From the cm68/usbfloppy 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 Usbfloppy design in my own project?

The repository has no license, so all rights stay with cm68. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Usbfloppy 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.