SBC80386EX
About the SBC80386EX PCB
SBC80386EX is an open source PCB design by danwerner21, published on GitHub. It is a 4-layer board measuring 160 × 100 mm, with 96 components from 49 distinct parts.
Other key parts include the I386EX_passive, i387SX, 74LS241, SRAM-32K and LP2950-3.3_TO92. By type, the board carries 39 capacitors, 24 ICs, 9 connectors, 8 diodes, 8 resistors and 1 crystal.
From the project
ECB 80386EX sbc
A single board computer built around the Intel 80386EX, an embedded 386 with most of a PC's support chips on the die. It plugs into a RetroBrew ECB backplane or runs on its own, and with the BIOS in this repository it boots MS-DOS 6.22 and COHERENT 4.2, Mark Williams Company's UNIX-like operating system.
The board was designed by John Coffman for RetroBrew Computers. Its project page, with the boards, the history and the community around it, is the SBC-386EX wiki page. This repository holds the board's design files, its BIOS, and the software that runs on it.
Main components on the SBC80386EX
SBC80386EX bill of materials (BOM)
96 components, 49 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | I386EX_passive | i386EX-132-adapter | U1 |
| 1 | i387SX | 80188 | U2 |
| 1 | 74LS241 | DIP-20__300 | U3 |
| 1 | SRAM-32K | DIP-28__300 | U4 |
| 1 | LP2950-3.3_TO92 | TO-92_Inline_Narrow_Oval | U5 |
| 1 | 29F040 | DIP-32__600 | U6 |
| 1 | MAX233 | DIP-20__300 | U7 |
| 1 | DS1302 | DIP-8__300 | U8 |
| 1 | 74HCT14 | DIP-14__300 | U9 |
| 1 | 74LS245 | DIP-20__300 | U10 |
| 3 | 74ALS244 | DIP-20__300 | U11, U12, U13 |
| 1 | 74LS240 | DIP-20__300 | U14 |
| 1 | 74LS74 | DIP-14__300 | U15 |
| 1 | CPU-66mhz | DIP-14__300 | U16 |
| 1 | CLK-1.8432 | DIP-14__300 | U17 |
| 3 | GAL16V8 | DIP-20__300 | U18, U22, U23 |
| 3 | 74F257 | DIP-16__300 | U19, U20, U21 |
| 1 | I386EX_PQFP | PQFP-132_i386_JRC | U101 |
| 1 | CRYSTAL | Tuning_Fork_Header_Straight_1x02_Pitch1.00mm | X1 |
| 3 | Conn_01x03 | PIN_ARRAY_3X1 | J1, J3, J4 |
Show 29 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Conn_02x05_Odd_Even | SHROUDED_5x2 | J2 |
| 1 | Conn_01x02 | PIN_ARRAY_2X1 | J5 |
| 1 | Conn_01x04 | PCpower4 | P1 |
| 1 | microSD-01 | microSD-Molex-47309 | P2 |
| 1 | Conn_02x20_Odd_Even | SHROUDED_20X2 | P3 |
| 1 | CONN_2 | PIN_ARRAY_2X1 | P4 |
| 1 | C96ABC | C96ABCM-RA | ECB1 |
| 2 | 10K | r_pack9 | RR1, RR2 |
| 1 | 470 | r_pack4 | RR3 |
| 1 | 10K | r_pack4 | RR5 |
| 1 | MT16D832 | DRAM-72-2021 | SIM1 |
| 1 | SW_PUSH | SW_PUSH_SMALL | SW1 |
| 1 | R/G LED | LED_D3.0mm | D1 |
| 1 | DIODE | D3 | D2 |
| 4 | LED | LED_D3.0mm | D3, D4, D5, D6 |
| 1 | 1N4148 | D3 | D7 |
| 1 | SD LED | LED_D3.0mm | D8 |
| 2 | 22uF | CP_Radial_D8.0mm_P2.50mm | C1, C2 |
| 6 | 10uf | CP_Radial_D5.0mm_P2.00mm | C3, C43, C44, C45, C46, C47 |
| 1 | SUPER | SuperCap5 | C4 |
| 28 | C | C_Disc_D5.0mm_W2.5mm_P5.00mm | C5, C6, C7, C8, C9, C10, C11, C12 +20 |
| 1 | 4.7uF | CP_Radial_D5.0mm_P2.00mm | C41 |
| 1 | 0.1 | C_Disc_D5.0mm_W2.5mm_P5.00mm | C42 |
| 1 | 68 | R3 | R1 |
| 1 | 10 | R3 | R2 |
| 1 | 10k | R3 | R3 |
| 1 | 270 | R3 | R4 |
| 2 | 2700 | R3 | R5, R6 |
| 2 | 4700 | R3 | R7, R8 |
SBC80386EX design files
The KiCad project lives in the danwerner21/SBC80386EX repository on GitHub; these links point at the commit this page was built from.
SBC80386EX: common questions
How big is the SBC80386EX PCB?
The SBC80386EX measures 160 × 100 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the SBC80386EX?
96 components, from 49 distinct parts. The full bill of materials is listed on this page.
Where can I download the SBC80386EX design files?
From the danwerner21/SBC80386EX repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the SBC80386EX design in my own project?
The repository has no license, so all rights stay with danwerner21. Use it as a reference, and ask the author before reusing the design.