2 layers19.2 × 37.1 mm RP ROM, the printed circuit board in 3D

RP ROM

Size: 19.2 × 37.1 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 35
Nets: 63
Pads: 195
Tracks, vias: 306, 58
Pours: 142
Routed: Yes
KiCad: KiCad 10.0 (file 20260206)
Created: 26 Apr 2026
Updated: 11 May 2026

Overview

RP ROM is an open-source printed circuit board by Yarnadori, from the Yarnadori/RP-ROM repository on GitHub, published under the MIT licence. It is a 2-layer board of 19.2 × 37.1 mm with 35 parts on 63 nets, routed with 306 tracks and 58 vias.

It is built around the RP2354A, RT9080-33GJ5 and RB521S-30. Its parts include 14 capacitors, 9 resistors, 4 connectors, 3 diodes and 2 ICs. It belongs with the RP2350 boards of this library.

Main components

README

README.md

RP-ROM

M27C256 EPROM エミュレータ。RP2354A (RP2350 QFN-60) を搭載した自作 PCB で、32KB の ROM コンテンツを USB 経由で書き込み・読み出しできる。

概要

項目	内容
対象 EPROM	M27C256 互換 (32KB, 15-bit address, 8-bit data)
MCU	RP2354A (RP2350 QFN-60, 360 MHz 動作)
インターフェース	USB-C (CDC Serial)
フラッシュ保持	電源断後も ROM データを内蔵フラッシュに保存

リポジトリ構成

text

RP-ROM/
├── hardware/          # KiCad プロジェクト (回路図・PCB)
│   └── production/    # 製造用ファイル (BOM, Gerber, 部品配置)
├── software/          # RP2350 ファームウェア (C / Pico SDK)
│   └── main.c
└── tools/             # ホスト側 Python ツール
    └── rom_tool.py

ハードウェア

KiCad で設計。製造 BOM の概要:

Ref	数量	部品 / 値	パッケージ / 備考	LCSC Part #
IC1	1	RP2354A	QFN-60, メイン MCU	C41378174
U1	1	RT9080-33GJ5	TSOT-23-5, 3.3V LDO	C7528830
J1	1	USB_C_Receptacle_USB2.0_16P	USB-C	C2843970
J2, J3	2	Conn_01x14_Pin	1×14 ピンヘッダ
J4	1	Conn_01x03	JST SH 3P, デバッガー	C7430452
SW1	1	SW_Push	TS-1088 系タクトスイッチ	C720477
Y1	1	12 MHz	3225 4-pin 水晶	C9002
L1	1	3.3uH	AOTA-B201610S3R3-101-T	C42411119
D1, D2	2	RB521S-30	SOD-523 ショットキーダイオード	C8523
D3	1	LED	0402	C51933305
C1	1	4.7nF	0402	C1538
C2, C3	2	1uF	0402	C52923
C5, C8	2	15pF	0402	C1548
C9, C10, C11	3	4.7uF	0402	C23733
C4, C6, C7, C12-C14	6	0.1uF	0402	C1525
R1	1	1MΩ	0402	C26083
R2, R3	2	5.1kΩ	0402	C25905
R4, R5, R6	3	1k	0402	C11702
R7, R8	2	27Ω	0402	C25100
R9	1	33Ω	0402	C25105

製造ファイルは hardware/production/ に格納。

ファームウェア

必要環境

Raspberry Pi Pico SDK v2.2.0

動作

Core 1: ROM アドレス線監視・データ出力 (フラッシュ不使用のタイトループ、360 MHz)
Core 0: USB シリアル経由のコマンド処理
永続化: 書き込んだ ROM データを内蔵フラッシュ末尾 36KB に保存。電源投入時に自動ロード。

ツール (tools/)

Python 製のホストツール。詳細は tools/README.md を参照。

bash

cd tools
uv run rom_tool.py write COM3 firmware.hex
uv run rom_tool.py read  COM3 dump.bin
uv run rom_tool.py verify COM3 firmware.hex
uv run rom_tool.py erase COM3
uv run rom_tool.py info  COM3

対応フォーマット: .bin / Intel HEX (.hex)

ライセンス

MIT License

Category and platform

RP2350

Project files

Show this board on your page

https://pcbkit.io/boards/Yarnadori/RP-ROM

The board's own page, for a message or a post.

Source

Repository: Yarnadori/RP-ROM
Board file: hardware/RP-ROM.kicad_pcb
Commit: c39af77
Licence: MIT

Parts

Qty	Value	Footprint	References
6	0.1u	Capacitor_SMD:C_0402_1005Metric	C4, C6, C7, C12, C13, C14
3	1k	Resistor_SMD:R_0402_1005Metric	R4, R5, R6
3	4.7u	Capacitor_SMD:C_0402_1005Metric	C9, C10, C11
2	15p	Capacitor_SMD:C_0402_1005Metric	C5, C8
2	1uF	Capacitor_SMD:C_0402_1005Metric	C2, C3
2	27	Resistor_SMD:R_0402_1005Metric	R7, R8
2	5.1kΩ	Resistor_SMD:R_0402_1005Metric	R2, R3
2	Conn_01x14_Pin	Connector_PinHeader_2.54mm:PinHeader_1x14_P2.54mm_Vertical	J2, J3
2	RB521S-30	Diode_SMD:D_SOD-523	D1, D2
1	12m	Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm	Y1
1	1MΩ	Resistor_SMD:R_0402_1005Metric	R1
1	3.3u	Yamadori_KiCad_Library:AOTA-B201610S3R3-101-T	L1
1	33	Resistor_SMD:R_0402_1005Metric	R9
1	4.7nF	Capacitor_SMD:C_0402_1005Metric	C1
1	Conn_01x03	Connector_JST:JST_SH_BM03B-SRSS-TB_1x03-1MP_P1.00mm_Vertical	J4
1	LED	LED_SMD:LED_0402_1005Metric	D3
1	RP2354A	Package_DFN_QFN:QFN-60-1EP_7x7mm_P0.4mm_EP3.4x3.4mm_ThermalVias	IC1
1	RT9080-33GJ5	Package_TO_SOT_SMD:TSOT-23-5	U1
1	SW_Push	Button_Switch_SMD:SW_SPST_TS-1088-xR020	SW1
1	USB_C_Receptacle_USB2.0_16P	Connector_USB:USB_C_Receptacle_G-Switch_GT-USB-7051x	J1

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Questions

How big is the RP ROM PCB?

It measures 19.2 × 37.1 mm and has 2 copper layers, 1.6 mm thick.

What parts does the RP ROM use?

35 parts, built around the RP2354A, RT9080-33GJ5 and RB521S-30. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the RP ROM KiCad files?

From the Yarnadori/RP-ROM repository on GitHub, at the commit this page was made from: the board is hardware/RP-ROM.kicad_pcb and its schematic hardware/RP-ROM.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the RP ROM design in my own project?

Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).