386EX
About the 386EX PCB
386EX is an open source PCB design by homebrew8088, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 132 × 73.9 mm, with 19 components from 16 distinct parts.
Other key parts include the I386EX, 8284, 74LS257 and 74LS04. By type, the board carries 4 ICs, 4 capacitors, 3 resistors, 2 crystals and 1 connector.
From the project
8088 PC XT Compatible
\ \ This is a repository for my 8088 PC Compatible project developed in 2021. The Motherboard is built to be generally PC XT compatible.
Join the discussion group on Discord\ https://discord.gg/AswNqwpRGP
eBay store\ http://www.ebay.com/sch/emil6190/m.html
Features:\ -8088, NEC V20, OR NEC V40 Processor\ -512k RAM (This can be changed)\ -8 Bit ISA sockets (4 slots or 7 slots)\ -PC Speaker\ -USB "Hard Drive"\ -PS/2 Keyboard\ -ATX form factor\ -Add on DMA controller (7 slot ISA only)
Main components on the 386EX
386EX bill of materials (BOM)
19 components, 16 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | I386EX | PQFP-132_24x24mm_P0.635mm_i386 | U1 |
| 1 | 8284 | DIP-18_W7.62mm | U2 |
| 1 | 74LS257 | DIP-16_W7.62mm | U3 |
| 1 | 74LS04 | DIP-14_W7.62mm | U4 |
| 1 | 33MHz | Oscillator_DIP-8 | X1 |
| 1 | Crystal | Crystal_HC18-U_Vertical | Y1 |
| 1 | Conn_01x09 | PinHeader_1x09_P2.54mm_Vertical | J8 |
| 1 | 8 BIT BUS EN | PinHeader_1x02_P2.54mm_Vertical | 8_BIT_BUS_EN1 |
| 1 | CLK2 SEL | PinHeader_1x03_P2.54mm_Vertical | CLK2_SEL1 |
| 1 | HOLDA EN | PinHeader_1x02_P2.54mm_Vertical | HOLDA_EN1 |
| 1 | OSC EN | PinHeader_1x03_P2.54mm_Vertical | OSC_EN1 |
| 1 | READY PIN EN | PinHeader_1x02_P2.54mm_Vertical | READY_PIN_EN1 |
| 4 | 0.1UF 0.1uF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C1, C2, C3, C4 |
| 1 | 27R 4.7K ohm | R_Array_SIP9 | R1 |
| 1 | 510R 27 ohm | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3 |
| 1 | 4.7K ohm | R_Array_SIP9 | R7 |
386EX design files
The KiCad project lives in the homebrew8088/8088-PC-Compatible repository on GitHub; these links point at the commit this page was built from.
386EX: common questions
How big is the 386EX PCB?
The 386EX measures 132 × 73.9 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the 386EX?
19 components, from 16 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the 386EX design files?
From the homebrew8088/8088-PC-Compatible repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the 386EX design in my own project?
Yes, under the terms of its GPL-3.0 license, which homebrew8088 chose for the repository.
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