2 layers116.8 × 30 mm
Type d
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
14 parts3kApache-2.0
2 layers69.9 × 52.3 mm
MCX128 25
Danjovic/MCX128_252New PCB for MCX-128 memory expansion for Radio Shack’s MC-10 microcomputer
- Size
- 69.9 × 52.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 14
- Nets
- 45
- Pads
- 154
- Tracks, vias
- 517, 36
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 28 May 2025
- Updated
- 14 Jul 2025
Overview
MCX128 25 is an open-source printed circuit board by Danjovic, from the Danjovic/MCX128_25 repository on GitHub, published under the CERN-OHL-S-2.0 licence. It is a 2-layer board of 69.9 × 52.3 mm with 14 parts on 45 nets, routed with 517 tracks and 36 vias.
Its parts include 4 ICs, 3 capacitors, 3 resistors, 1 diode and 1 connector. It belongs with the FPGA and CPLD boards of this library.
README
README.mdMCX128_25
New PCB for MCX-128 memory expansion for Radio Shack’s MC-10 microcomputer
Features:
- Reduced the PCB size
- Change the 74LS21 dual quad AND gate for an 74LS08 which is easier to find
- Added a power LED
- ROM selection can be done either by Read Switches or Jumpers
Parts
14| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 100n | Capacitor_THT:C_Disc_D7.5mm_W2.5mm_P5.00mm | C1, C2, C3 |
| 2 | 10K | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1, R2 |
| 1 | 27512 | Package_DIP:DIP-28_W15.24mm | U4 |
| 1 | 2k2 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R3 |
| 1 | 5645235-4 | Connectors:5645235-4 | J1 |
| 1 | 628128_DIP32_SSOP32 | Package_DIP:DIP-32_W15.24mm | U3 |
| 1 | 74LS08 | Package_DIP:DIP-14_W7.62mm | U1 |
| 1 | GAL22V10 | Package_DIP:DIP-24_W7.62mm | U2 |
| 1 | LED_3mm | LED_THT:LED_D3.0mm | D1 |
| 1 | PINHD_1x2_Male | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP1 |
| 1 | SW_DIP_x02 | Button_Switch_THT:SW_DIP_SPSTx02_Slide_9.78x7.26mm_W7.62mm_P2.54mm | SW1 |
Questions
How big is the MCX128 25 PCB?
It measures 69.9 × 52.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the MCX128 25 use?
14 parts. 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 MCX128 25 KiCad files?
From the Danjovic/MCX128_25 repository on GitHub, at the commit this page was made from: the board is Hardware/Kicad/MCX128_25.kicad_pcb and its schematic Hardware/Kicad/MCX128_25.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the MCX128 25 design in my own project?
Its repository publishes it under the CERN-OHL-S-2.0 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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