2 layers99.1 × 99.1 mm
2 layers99.1 × 99.1 mm
Command decoder
ksmonkey123/8bit_computer1custom 8bit microprocessor project
- Size
- 99.1 × 99.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 34
- Nets
- 94
- Pads
- 309
- Tracks, vias
- 958, 35
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 10 Dec 2024
- Updated
- 9 Sep 2026
Overview
Command decoder 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 34 parts on 94 nets, routed with 958 tracks and 35 vias.
It is built around the 74HC138. Its parts include 8 ICs, 6 capacitors, 6 connectors, 1 resistor and 1 diode.
Main components
1Parts
34| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 74HC138 | Package_DIP:DIP-16_W7.62mm_LongPads | U1, U2, U3, U4, U7 |
| 5 | C | Capacitor_SMD:C_0603_1608Metric | C2, C3, C4, C5, C6 |
| 4 | MountingHole_Pad | MountingHole:MountingHole_3.2mm_M3_Pad_Via | H1, H2, H3, H4 |
| 3 | 4011 | Package_DIP:DIP-14_W7.62mm_LongPads | U5, U6, U8 |
| 3 | Conn_01x16 | Connector_IDC:IDC-Header_2x08_P2.54mm_Vertical | CTRL_BUS1, CTRL_BUS2, CTRL_BUS3 |
| 3 | R_Network08 | Resistor_THT:R_Array_SIP9 | RN1, RN2, RN3 |
| 2 | Conn_01x05 | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J2, J5 |
| 2 | Conn_01x16 | Connector_IDC:IDC-Header_2x08_P2.54mm_Horizontal | CMD_BUS1, DATA_BUS1 |
| 1 | 1K | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | C_Polarized | Capacitor_SMD:CP_Elec_5x5.3 | C1 |
| 1 | Conn_01x01 | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J3 |
| 1 | Conn_01x07 | Connector_PinHeader_2.54mm:PinHeader_1x07_P2.54mm_Vertical | J6 |
| 1 | Conn_01x08 | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J4 |
| 1 | LED | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | Screw_Terminal_01x02 | TerminalBlock_TE-Connectivity:TerminalBlock_TE_282834-2_1x02_P2.54mm_Horizontal | J1 |
Questions
How big is the Command decoder PCB?
It measures 99.1 × 99.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Command decoder use?
34 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 Command decoder KiCad files?
From the ksmonkey123/8bit_computer repository on GitHub, at the commit this page was made from: the board is circuits/pc-08_command_decoder/command_decoder.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 Command decoder 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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