4 layers100 × 100 mm
Intel 8088 Computer
oberrow/i8088-computer
Code for an i8088-based non-PC compatible breadboard computer
69 parts1MIT
2 layers63.8 × 77.6 mm
UART Unit
oberrow/i8088-computer1Code for an i8088-based non-PC compatible breadboard computer
- Size
- 63.8 × 77.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 13
- Nets
- 52
- Pads
- 126
- Tracks, vias
- 332, 13
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 25 Apr 2026
- Updated
- 20 Jul 2026
Overview
UART Unit is an open-source printed circuit board by oberrow, from the oberrow/i8088-computer repository on GitHub, published under the MIT licence. It is a 2-layer board of 63.8 × 77.6 mm with 13 parts on 52 nets, routed with 332 tracks and 13 vias.
It is built around the 74LS540PC. Its parts include 5 capacitors, 3 ICs, 2 connectors, 1 resistor and 1 transistor. It belongs with the interfaces and adapters boards of this library.
Main components
1Parts
13| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | C | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C1, C2 |
| 2 | C | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C3, C4 |
| 1 | 16550 | Package_DIP:DIP-40_W15.24mm | U1 |
| 1 | 2N7000 | Package_TO_SOT_THT:TO-92_Inline | Q2 |
| 1 | 74LS540 | Package_DIP:DIP-20_W7.62mm | U3 |
| 1 | C 470nF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C5 |
| 1 | Conn_01x05_MountingPin | Connector_FFC-FPC:Molex_200528-0050_1x05-1MP_P1.00mm_Horizontal | J1 |
| 1 | Conn_01x28 | Connector_PinHeader_2.54mm:PinHeader_2x14_P2.54mm_Vertical | J2 |
| 1 | Crystal | Crystal:Crystal_HC49-U_Vertical | Y1 |
| 1 | MCP2221AxP | Package_DIP:DIP-14_W7.62mm | U2 |
| 1 | R 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
Questions
How big is the UART Unit PCB?
It measures 63.8 × 77.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the UART Unit use?
13 parts, built around the 74LS540PC. 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 UART Unit KiCad files?
From the oberrow/i8088-computer repository on GitHub, at the commit this page was made from: the board is kicad/UART_Unit/UART_Unit.kicad_pcb and its schematic kicad/82C55_GPIO_Unit/82C55_GPIO_Unit.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the UART Unit 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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