486 Breakout
About the 486 Breakout
486 Breakout is an open source PCB design by FoxCutter, published on GitHub under the BSD-3-Clause license. It is a 4-layer board measuring 100 × 100 mm, with 48 components from 20 distinct parts.
Other key parts include the 80486DX and 7400. By type, the board carries 19 resistors, 15 connectors, 10 capacitors, 3 ICs and 1 jumper.
It belongs with the dev boards & breakouts designs in this gallery.
From the project
Repo for the 486 breadboard computer project
The decoupling capacitors for the CPU are made with surface mount parts. This is done because the gap the socket provides between board and CPU is fairly limited, and while Through-Hole parts can be used, they might not have enough clearance. Now these are using 0805/2012 size resistors, and are fairly spread out so there should be enough room even if you've never worked with surface mount parts before.
Main components on the 486 Breakout
486 Breakout bill of materials (BOM)
48 components, 20 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 80486DX | PGA169 | U1 |
| 2 | 7400 | DIP-14_W7.62mm | U2, U3 |
| 1 | PWR | PinHeader_1x02_P2.54mm_Vertical | J1 |
| 1 | Conn_02x04_Counter_Clockwise | PinHeader_2x04_P2.54mm_Vertical | J2 |
| 1 | Not Connected | PinHeader_1x20_P2.54mm_Vertical | J3 |
| 1 | Address Bus | PinHeader_1x36_P2.54mm_Vertical | J4 |
| 1 | Data Bus | PinHeader_1x36_P2.54mm_Vertical | J5 |
| 2 | Conn_02x03_Counter_Clockwise | PinHeader_2x03_P2.54mm_Vertical | J6, J10 |
| 1 | Control Bus | PinHeader_1x08_P2.54mm_Vertical | J7 |
| 1 | Cache | PinHeader_1x07_P2.54mm_Vertical | J8 |
| 1 | Parity | PinHeader_1x05_P2.54mm_Vertical | J9 |
| 1 | Byte Enabled | PinHeader_1x07_P2.54mm_Vertical | J11 |
| 1 | FPU | PinHeader_1x02_P2.54mm_Vertical | J12 |
| 1 | Input | PinHeader_1x07_P2.54mm_Vertical | J13 |
| 1 | Bus Size | PinHeader_1x02_P2.54mm_Vertical | J14 |
| 1 | Bus Arbitration | PinHeader_1x05_P2.54mm_Vertical | J15 |
| 1 | Vcc to J1 | SolderJumper-2_P1.3mm_Bridged_Pad1.0x1.5mm | JP1 |
| 8 | 105 | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C3, C4, C5, C6, C7, C8 |
| 2 | 105 | C_Disc_D3.4mm_W2.1mm_P2.50mm | C9, C10 |
| 19 | 10k | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R1, R2, R3, R4, R5, R6, R7, R8 +11 |
486 Breakout design files
The KiCad project lives in the FoxCutter/486Dev repository on GitHub; these links point at the commit this page was built from.
486 Breakout: common questions
How big is the 486 Breakout?
The 486 Breakout measures 100 × 100 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the 486 Breakout?
48 components, from 20 distinct parts. The full bill of materials is listed on this page.
Where can I download the 486 Breakout design files?
From the FoxCutter/486Dev repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the 486 Breakout design in my own project?
Yes, under the terms of its BSD-3-Clause license, which FoxCutter chose for the repository.
More boards in 486Dev
Similar boards
134pin 7-967288-1
rusefi
139.7 × 73.7 mm38 parts2LGPL-3.01.2k
Breakout 112pin Connector
174 × 58 mm39 parts2LGPL-3.01.2k
Breakout 60pin EEC-IV
139.7 × 62.2 mm15 parts2LGPL-3.01.2k
Eecv breakout
140.8 × 53.7 mm9 parts4LGPL-3.01.2k
88 Pin Vag Breakout
142 × 58 mm91 parts2LGPL-3.01.2k
Rj45 breakout
rene-dev
15.2 × 53.8 mm3 parts2LGPL-3.0979