2 layers95 × 95 mm
2 layers95 × 95 mm
StackCPU
hra1129/FPGA_MSXtR13- Size
- 95 × 95 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 59
- Nets
- 183
- Pads
- 525
- Tracks, vias
- 2,070, 418
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 1 Mar 2026
- Updated
- 7 Nov 2026
Overview
StackCPU is an open-source printed circuit board by hra1129, from the hra1129/FPGA_MSXtR repository on GitHub, published under the MIT licence. It is a 2-layer board of 95 × 95 mm with 59 parts on 183 nets, routed with 2,070 tracks and 418 vias.
It is built around the W25Q32JVSSIQ. Its parts include 22 resistors, 13 capacitors, 12 ICs, 6 connectors and 3 switches.
Main components
1Parts
59| Qty | Value | Footprint | References |
|---|---|---|---|
| 14 | 3.3K | Resistor_SMD:R_0402_1005Metric | R7, R8, R9, R10, R11, R12, R15, R16, R17, R18, R19, R20, R21, R22 |
| 9 | 0.1uF | Capacitor_SMD:C_0402_1005Metric | C1, C3, C4, C5, C6, C9, C10, C11, C13 |
| 4 | 22K | Resistor_SMD:R_0402_1005Metric | R3, R4, R5, R6 |
| 4 | ~ | My Parts:QSPI-SRAM 4Mbit (8SOIC) | U5, U6, U7, U8 |
| 2 | 100K | Resistor_SMD:R_0402_1005Metric | R13, R14 |
| 2 | 5.1K | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 2 | ~ | Package_SO:TSOP-I-32_11.8x8mm_P0.5mm | U11, U12 |
| 1 | 100uF | Capacitor_SMD:C_1210_3225Metric | C7 |
| 1 | 15pF | Capacitor_SMD:C_0805_2012Metric | C2 |
| 1 | 1uF | Capacitor_SMD:C_0402_1005Metric | C8 |
| 1 | 470uF | My Parts:Capacitor(C453487) | C12 |
| 1 | Conn_02x06_Odd_Even | Connector_PinSocket_2.54mm:PinSocket_2x06_P2.54mm_Vertical | J3 |
| 1 | Keybard I2C Connector | 0-My_Parts:Grove_I2C | J5 |
| 1 | LOGO | 0-My_Parts:usa | G2 |
| 1 | LOGO | 0-My_Parts:msx_logo | G1 |
| 1 | MSX_EXBUS_A | Connector_PinHeader_2.54mm:PinHeader_2x20_P2.54mm_Vertical | J1 |
| 1 | MSX_EXBUS_B | Connector_PinHeader_2.54mm:PinHeader_2x20_P2.54mm_Vertical | J2 |
| 1 | Micro_SD_Card | 0-My_Parts:MicroSD(C91145) | J4 |
| 1 | SW_DIP_x04 | My Parts:DipSW4(C129043) | SW3 |
| 1 | SW_MEC_5G | My Parts:SideSW(C963235) | SW1 |
| 1 | SW_SPDT | My Parts:Slide SW(C7431058) | SW2 |
| 1 | USB_C_Receptacle_PowerOnly_6P | 0-My_Parts:USB-C(C2927029) | J6 |
| 1 | W25Q32JVSS | Package_SO:SOIC-8_5.3x5.3mm_P1.27mm | U10 |
| 1 | ~ | My Parts:TangPrimer25K(LOWER) | U2 |
| 1 | ~ | My Parts:TangPrimer25K(UPPER) | U1 |
| 1 | ~ | My Parts:RaspberryPiPico2W | U4 |
| 1 | ~ | My Parts:DCDC_MAU108 | U9 |
| 1 | ~ | My Parts:CLOCK | U3 |
The 58 most common of 59 parts.
Questions
How big is the StackCPU PCB?
It measures 95 × 95 mm and has 2 copper layers, 1.6 mm thick.
What parts does the StackCPU use?
59 parts, built around the W25Q32JVSSIQ. 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 StackCPU KiCad files?
From the hra1129/FPGA_MSXtR repository on GitHub, at the commit this page was made from: the board is pcb/FPGA_MSXtR_Stack_CPU/StackCPU.kicad_pcb and its schematic pcb/FPGA_MSXtR/FPGA_MSXtR.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the StackCPU 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).
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