Civil25
About the Civil25 PCB
Civil25 is an open source PCB design by raleighslack, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 137.2 × 137.2 mm, with 40 components from 34 distinct parts.
Other key parts include the 8088_Min_Mode, SST39SF020, AS6C4008-55PCN, 74HC245 and 74HC373. By type, the board carries 18 ICs, 7 capacitors, 5 resistors, 3 switches, 2 crystals and 2 connectors.
From the project
A 8088 based SBC
This is a simple 8088 based SBC that doesnt aim for any kind of PC compatibility. This is just generally a project to learn about the 8088 and other processors.
Current assembler in use is NASM. I am working on the Currently in progress goals listed below, as well as software to support it along the way.
- 1x 80c88 CPU - 2x 74HCT373 D-type Octal Latch - 1x 74HCT245 Bus Trancever - 2x 74HCT138 3-to-8 Decoder - 1x SST39SF020A Flash - 1x AS6C4008 RAM - 1x 82c55A PPI - 1x 82c59 PIC - 1x 555/8284 Clock Generator(And supporting circuitry) - 1x YM3812 FM Sound - 1x TL072 Op-Amp - 1x Y3014B DAC -…
Main components on the Civil25
Civil25 bill of materials (BOM)
40 components, 34 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 8088_Min_Mode | DIP-40_W15.24mm | U1 |
| 1 | SST39SF020 | DIP_Socket-32_W11.9_W12.7_W15.24_W17.78_W18.5_3M_232-1285-00-0602J | U2 |
| 1 | AS6C4008-55PCN | DIP-32_W15.24mm | U3 |
| 1 | 74HC245 | DIP-20_W7.62mm_Socket | U4 |
| 2 | 74HC373 | DIP-20_W7.62mm_Socket | U5, U6 |
| 1 | 74HCT238 | DIP-16_W7.62mm_Socket | U7 |
| 1 | 74HC14 | DIP-14_W7.62mm_Socket | U8 |
| 1 | 82C55A | DIP-40_W15.24mm | U9 |
| 1 | LCD-016N002L | WC1602A | U10 |
| 1 | 74LS138 | DIP-16_W7.62mm_Socket | U11 |
| 2 | LM555xN | DIP-8_W7.62mm | U12, U15 |
| 1 | 8284 | DIP-18_W7.62mm | U13 |
| 1 | 74LS10 | DIP-14_W7.62mm_Socket | U14 |
| 1 | YM3812 | DIP-24_W15.24mm_Socket | U16 |
| 1 | Y3014B | DIP-8_W7.62mm_Socket | U17 |
| 1 | TL072 | DIP-8_W7.62mm_Socket | U18 |
| 1 | 3.579545MHz | Oscillator_DIP-14 | X1 |
| 1 | 15mHz | Crystal_HC18-U_Vertical | Y1 |
| 1 | USB_B | USB_B_Lumberg_2411_02_Horizontal | J1 |
| 1 | AudioJack3 | Jack_3.5mm_CUI_SJ1-3533NG_Horizontal_CircularHoles | J2 |
Show 14 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 10k | Potentiometer_ACP_CA9-V10_Vertical | RV1 |
| 1 | 1M | Potentiometer_ACP_CA9-V10_Vertical | RV2 |
| 1 | M2024SA2G40 | M2024SA2G40 | S1 |
| 2 | SW_Push | SW_PUSH_6mm_H4.3mm | SW1, SW2 |
| 1 | LED | LED_D5.0mm | D1 |
| 1 | 1uF | CP_Radial_D5.0mm_P2.50mm | C1 |
| 3 | 100nF | C_Disc_D6.0mm_W2.5mm_P5.00mm | C2, C4, C5 |
| 1 | 4.7uF | CP_Radial_D5.0mm_P2.50mm | C3 |
| 1 | 10uf | CP_Radial_D5.0mm_P2.50mm | C6 |
| 1 | 1000uf | CP_Radial_D5.0mm_P2.50mm | C7 |
| 2 | 1k | R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1, R3 |
| 1 | 10k | R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R2 |
| 1 | 1M | R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R4 |
| 1 | 330 | R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R5 |
Civil25 design files
The KiCad project lives in the raleighslack/civil25 repository on GitHub; these links point at the commit this page was built from.
- Layoutkicad/civil25.kicad_pcb
- Schematickicad/civil25.kicad_sch
Civil25: common questions
How big is the Civil25 PCB?
The Civil25 measures 137.2 × 137.2 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Civil25?
40 components, from 34 distinct parts. The full bill of materials is listed on this page.
Where can I download the Civil25 design files?
From the raleighslack/civil25 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Civil25 design in my own project?
Yes, under the terms of its Apache-2.0 license, which raleighslack chose for the repository.