2 layers99.1 × 99.1 mm
2 layers99.1 × 99.1 mm
Microcode
ksmonkey123/8bit_computer1custom 8bit microprocessor project
- Size
- 99.1 × 99.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 18
- Nets
- 50
- Pads
- 189
- Tracks, vias
- 423, 24
- Pours
- 8
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 10 Dec 2024
- Updated
- 9 Sep 2026
Overview
Microcode is an open-source printed circuit board by ksmonkey123, from the ksmonkey123/8bit_computer repository on GitHub, published under the MIT licence. It is a 2-layer board of 99.1 × 99.1 mm with 18 parts on 50 nets, routed with 423 tracks and 24 vias.
It is built around the 74HC138. Its parts include 5 capacitors, 4 ICs and 2 connectors.
Main components
1Parts
18| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | C | Capacitor_SMD:C_0603_1608Metric | C2, C3, C4, C5 |
| 4 | MountingHole_Pad | MountingHole:MountingHole_3.2mm_M3_Pad_Via | H1, H2, H3, H4 |
| 3 | Conn_01x16 | Connector_IDC:IDC-Header_2x08_P2.54mm_Horizontal | BACKPLANE1, BACKPLANE2, INTCON_C1 |
| 1 | 4011 | Package_DIP:DIP-14_W7.62mm | U4 |
| 1 | 74HC138 | Package_DIP:DIP-16_W7.62mm | U3 |
| 1 | C_Polarized | Capacitor_SMD:CP_Elec_5x5.3 | C1 |
| 1 | Conn_01x05 | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J1 |
| 1 | Screw_Terminal_01x04 | TerminalBlock:TerminalBlock_Xinya_XY308-2.54-4P_1x04_P2.54mm_Horizontal | J2 |
| 1 | microcode high | customs:DIP-28_600_ELL | U2 |
| 1 | microcode low | customs:DIP-28_600_ELL | U1 |
Questions
How big is the Microcode PCB?
It measures 99.1 × 99.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Microcode use?
18 parts, built around the 74HC138. 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 Microcode KiCad files?
From the ksmonkey123/8bit_computer repository on GitHub, at the commit this page was made from: the board is circuits/pc-13_microcode/microcode.kicad_pcb and its schematic circuits/pc-01_dual_8bit_register/dual_8bit_register.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Microcode 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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