GBC Cartridge MITM breakout
ALXCO-Hardware·squareboi·Hardware/KiCad 5 Legacy/Mainboard/Squareboi2.kicad_pcb
About the GBC Cartridge MITM breakout
GBC Cartridge MITM breakout is an open source PCB design by ALXCO-Hardware, published on GitHub under the CC-BY-4.0 license. It is a 2-layer board measuring 72 × 139 mm, with 24 components from 16 distinct parts.
Other key parts include the SST39SF040 and ATF1502AS-PLCC. By type, the board carries 10 connectors, 7 resistors, 3 capacitors, 2 ICs, 1 switch and 1 diode.
It belongs with the dev boards & breakouts designs in this gallery.
From the project
The open hardware GB/GBC cartridge system
Squareboi is an open hardware cartridge system for the Game Boy Color, made to be as accessible and DIY-friendly as possible. Using a handful of off-the-shelf components, it provides the same functionality as an original cartridge, compatible with the majority of programs. Additionally, an Arduino-based programmer allows for easy transfer of games and save data.

Main components on the GBC Cartridge MITM breakout
GBC Cartridge MITM breakout bill of materials (BOM)
24 components, 16 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | SST39SF040 | DIP-32_W15.24mm_Socket_LongPads | U1 |
| 1 | ATF1502AS-PLCC | PLCC-44_THT-Socket | U3 |
| 1 | GB-CART | GB_CART_FINGERS | J1 |
| 1 | ROMC_L | PinSocket_1x16_P2.54mm_Vertical | J2 |
| 1 | ROMC_C | PinSocket_1x04_P2.54mm_Vertical | J4 |
| 1 | RAMC_L | PinSocket_1x14_P2.54mm_Vertical | J5 |
| 1 | RAMC_R | PinSocket_1x14_P2.54mm_Vertical | J6 |
| 1 | JTAG | IDC-Header_2x05_P2.54mm_Vertical | J7 |
| 1 | AUX_POW | Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J8 |
| 1 | TP_CLK | PinSocket_1x01_P2.54mm_Vertical | J10 |
| 1 | TP_40 | PinSocket_1x01_P2.54mm_Vertical | J11 |
| 1 | TP_RST | PinSocket_1x01_P2.54mm_Vertical | J12 |
| 1 | SW_DIP_x02 | SW_DIP_SPSTx02_Piano_10.8x6.64mm_W7.62mm_P2.54mm | SW1 |
| 1 | LED | LED_D3.0mm_Horizontal_O1.27mm_Z2.0mm | D1 |
| 3 | 100n | CP_Radial_D5.0mm_P2.50mm | C1, C2, C3 |
| 7 | 20K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2, R3, R4, R5, R8, R9 |
GBC Cartridge MITM breakout design files
The KiCad project lives in the ALXCO-Hardware/squareboi repository on GitHub; these links point at the commit this page was built from.
GBC Cartridge MITM breakout: common questions
How big is the GBC Cartridge MITM breakout?
The GBC Cartridge MITM breakout measures 72 × 139 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the GBC Cartridge MITM breakout?
24 components, from 16 distinct parts. The full bill of materials is listed on this page.
Where can I download the GBC Cartridge MITM breakout design files?
From the ALXCO-Hardware/squareboi repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the GBC Cartridge MITM breakout design in my own project?
Yes, under the terms of its CC-BY-4.0 license, which ALXCO-Hardware chose for the repository.
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