HardLabs

386 adapter

hkzlab·386DX_QFP_PGA_Adapter·adapter/386_adapter.kicad_pcb

386 adapter PCB layout, top view — open source board by hkzlab
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About the 386 adapter PCB

386 adapter is an open source PCB design by hkzlab, published on GitHub under the CC-BY-SA-4.0 license. It is a 2-layer board measuring 38.1 × 38.1 mm, with 4 components from 3 distinct parts.

By type, the board carries 2 ICs and 2 capacitors.

It belongs with the retro computing designs in this gallery.

From the project

A QFP -> PGA adapter for 386DX CPUs

386DX CPUs in ceramic PGA packages are getting rarer and more expensive by the day, while QFP variants can still be found relatively easily. But some motherboards don't have a space for a QFP CPU, and they're an hassle to swap anyway.

This project provides a way to adapt the QFP variants of the 386DX cpus to a PGA format, by using commonly available hardware parts. I tested the procedure on an AM386DX @ 40Mhz, and the machine happily ran memory tests and benchmarks for hours.

386 adapter, from the project README
From the project README

386 adapter bill of materials (BOM)

4 components, 3 distinct parts.

QtyPartRefs
1
~
U1
1
~
U2
2
100nF
C1, C2

386 adapter design files

The KiCad project lives in the hkzlab/386DX_QFP_PGA_Adapter repository on GitHub; these links point at the commit this page was built from.

386 adapter: common questions

How big is the 386 adapter PCB?

The 386 adapter measures 38.1 × 38.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the 386 adapter?

4 components, from 3 distinct parts. The full bill of materials is listed on this page.

Where can I download the 386 adapter design files?

From the hkzlab/386DX_QFP_PGA_Adapter repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the 386 adapter design in my own project?

Yes, under the terms of its CC-BY-SA-4.0 license, which hkzlab chose for the repository.

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