PS1 Memory Card USB

An RP2040 board shaped to fit a PlayStation memory-card shell, with native USB-C and push-push microSD storage. It targets the open-source PicoMemcard firmware pinout and was designed end-to-end in Fabdesk.

Prototype status: the PCB is fully routed and passes KiCad PCB DRC with zero errors and zero unconnected items. It has not yet been manufactured or bench-tested. Review the design and prototype cautiously before connecting it to a console.

What is on the board

• RP2040 in QFN-56, W25Q16 16-Mbit QSPI flash, and BOOTSEL button
• USB-C device port with both connector orientations wired, 5.1 kΩ CC pull-downs, and 27 Ω data termination
• Push-push CS-204 microSD socket on the bottom side
• Console and USB power-source isolation: console 3.3 V and regulated USB 3.3 V are Schottky diode-ORed
• ABM8-272-T3 12 MHz oscillator network with 15 pF load capacitors and 1 kΩ damping resistor
• Eight PS1 memory-card edge contacts and the reference shell outline/mounting holes
• Four copper layers, 1.6 mm thickness, and filled GND planes on F.Cu/B.Cu

Firmware pin mapping

Function	RP2040 GPIO
PS1 DAT	GP5
PS1 CMD	GP6
PS1 SEL	GP7
PS1 CLK	GP8
PS1 ACK	GP9
microSD DAT0/MISO	GP16
microSD CD/DAT3/CS	GP17
microSD CLK	GP18
microSD CMD/MOSI	GP19
Status LED	GP25

Repository layout

• circuit.tsx — authoritative Fabdesk/tscircuit source
• outline.ts — PS1 memory-card board outline derived from PicoMemcard
• fabdesk.json — four-layer routing and manufacturing constraints
• board.kicad_pcb, board.kicad_sch, board.kicad_pro — generated KiCad project; the PCB is the final routed board
• board.dsn, board-final.ses — final Specctra routing exchange files
• renders/ — top and bottom board renders
• reports/final-drc.json — KiCad 10 DRC result
• exports/gerbers/ — Gerbers and Excellon drill output
• exports/bom.csv, exports/positions.csv — cleaned BOM and pick-and-place data
• exports/fabrication.zip — ready-to-review fabrication bundle

Rebuilding in Fabdesk

Open this directory as a Fabdesk project and build circuit.tsx. The committed board.kicad_pcb contains the final FreeRouting route and GND fills. Regenerating KiCad from circuit.json will recreate an unrouted board, so keep or branch the committed PCB before converting again.

Manufacturing constraints used for the final board:

Constraint	Value
Copper layers	4
Board thickness	1.6 mm
Minimum trace width	0.10 mm
Minimum clearance	0.10 mm
Via diameter / drill	0.45 / 0.20 mm
Minimum copper-to-edge	0.20 mm

The final PCB reports 465 routed track segments, 43 vias, zero DRC errors, and zero unconnected items. The remaining DRC notices are cosmetic generated-footprint silkscreen/text warnings. Fabdesk's current circuit-json-to-KiCad converter emits incorrect metadata for some custom schematic symbols, so KiCad ERC output is not used as the release gate; circuit.tsx, the PCB netlist, and PCB DRC are authoritative.

Ordering notes

• Confirm every BOM row without an LCSC number before assembly.
• J3 is assembled on the bottom, so this is a double-sided assembly.
• Specify a durable edge-contact finish; hard gold is preferred for repeated insertion.
• Verify shell fit, card-contact pressure, USB clearance, and power rails on an unpowered console or fixture before live testing.
• exports/fabrication.zip is a reviewable starting package, not a substitute for your fabricator's upload preview and rule check.

Credits and license

The mechanical outline and console-contact placement are derived from dangiu/PicoMemcard, licensed under GPL-3.0. The RP2040 support circuit follows Raspberry Pi's Hardware design with RP2040.

This repository is licensed under the GNU General Public License v3.0. See LICENSE.

PlayStation is a trademark of Sony Interactive Entertainment. This is an independent open-hardware project and is not affiliated with or endorsed by Sony.