2 layers44.4 × 52.1 mm
Qfp52-adapter
sqpat/8088-Adapters
PLCC/QFP to DIP40 Adapter kicad files for 8088/8086 and V20/V30
3 parts1
2 layers25.4 × 52.1 mm
Plcc44 adapter
sqpat/8088-Adapters1PLCC/QFP to DIP40 Adapter kicad files for 8088/8086 and V20/V30
- Size
- 25.4 × 52.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 3
- Nets
- 42
- Pads
- 86
- Tracks, vias
- 133, 1
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 27 May 2026
- Updated
- 27 May 2026
Overview
Plcc44 adapter is an open-source printed circuit board by sqpat, from the sqpat/8088-Adapters repository on GitHub. It is a 2-layer board of 25.4 × 52.1 mm with 3 parts on 42 nets, routed with 133 tracks and 1 via.
Its parts include 2 ICs and 1 capacitor. It belongs with the interfaces and adapters boards of this library.
README
README.md8088/8086 v20/v30 adapters for QFP52 and PLCC44 chips to convert to 40 pin DIP.
The main reason for this project is that most 16 mhz DIP40 v20s and v30s online are fakes, but QFP and PLCC versions are available and don't seem to be faked. The adapters are small and you can toss them into your next pcb order and get a bunch made for cheap.
QFP52 adapter tested with UPD70116HG-16 (V30) in IBM PS/2 Model 30 PLCC44 adapter tested with N80C88AL-2 (8088) and UPD70108HLM-16(V20) in Juko Super Turbo
Some notes:
-
IMPORTANT! Most pin headers will not fit in a DIP socket. Look for machined pin headers. I personally used some on Amazon called "Chanzon Round Pin Header Strip" which claim to have 0.5mm thick legs.
-
The NEC QFP52 legs seem to extend beyond the kicad library pads so I had to manually push in all the legs with tweezers to have room to solder them which is a little annoying. Someone with more time on their hands could improve this.
-
The QFP52 layout is large and unfortunately may cover up the 8087 socket in the machine. The pins might give the adapter clearance over the FPU though.
Parts
3| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | 100nF | Capacitor_SMD:C_0805_2012Metric | C1 |
| 1 | 16bit_rom | dip40_mod:PLCC-44_THT-Socket_mod | U1 |
| 1 | 16bit_rom_dip40 | dip40_mod:DIP-40_W15.24mm_mod | U2 |
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Questions
How big is the Plcc44 adapter PCB?
It measures 25.4 × 52.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Plcc44 adapter use?
3 parts. 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 Plcc44 adapter KiCad files?
From the sqpat/8088-Adapters repository on GitHub, at the commit this page was made from: the board is plcc44-adapter/plcc44_adapter.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Plcc44 adapter design in my own project?
Its repository states no licence, so its author keeps all rights: ask sqpat before reusing the design.