2 layers66.9 × 74.5 mm
2 layers10 × 40.5 mm
Lte memory card
wichers/compaq-lte-expanded-memory1Open-source hardware reverse-engineering of the proprietary Compaq LTE & LTE/286 expanded memory module.
- Size
- 10 × 40.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 20
- Nets
- 49
- Pads
- 386
- Tracks, vias
- 2,314, 141
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 14 Jun 2026
- Updated
- 16 Jun 2026
Overview
Lte memory card is an open-source printed circuit board by wichers, from the wichers/compaq-lte-expanded-memory repository on GitHub, published under the MIT licence. It is a 2-layer board of 10 × 40.5 mm with 20 parts on 49 nets, routed with 2,314 tracks and 141 vias.
Its parts include 16 ICs, 3 resistors and 1 connector.
README
README.mdCompaq LTE & LTE/286 Expanded Memory Module Reverse-Engineering
An open-source hardware project dedicated to reverse-engineering, documenting, and replicating the proprietary memory expansion modules used in the vintage Compaq LTE and Compaq LTE/286 laptops.
?? Project Overview
The Compaq LTE series (released in 1989) utilized rare, proprietary memory expansion cards to add Expanded Memory (EMS). Because these original modules are increasingly difficult to find and prone to component failure, this repository serves as a centralized resource for modern preservation, repair, and replication.
The goal of this project is to provide full schematics, verified pinouts, and modern drop-in replacement PCB designs so that enthusiasts can build their own expansion cards or repair existing vintage hardware.
?? Features & Progress
- Pinout Documentation: Mapping the proprietary edge connector interfaces.
- Schematic Capture: Tracing out the original RAM array logic, decoupling capacitors, and mapping control lines.
- PCB Layout: Designing a modern, drop-in replacement PCB using standard surface-mount or through-hole components where appropriate.
- Testing & Validation: Testing the replicated modules in real hardware using standard diagnostic software.
Parts
20| Qty | Value | Footprint | References |
|---|---|---|---|
| 16 | MCM414256 | footprints:SOJ-20-26_300mil | U1, U2, U3, U4, U5, U6, U7, U8, U9, U10, U11, U12, U13, U14, U15, U16 |
| 3 | 100 | Resistor_SMD:R_0805_2012Metric | R1, R2, R3 |
| 1 | Conn_02x30_Odd_Even | footprints:WingTAT_HEE60LP03BK_2x30_P1.27mm_Edge | J1 |
Questions
How big is the Lte memory card PCB?
It measures 10 × 40.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Lte memory card use?
20 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 Lte memory card KiCad files?
From the wichers/compaq-lte-expanded-memory repository on GitHub, at the commit this page was made from: the board is KiCad/lte_memory_card.kicad_pcb and its schematic KiCad/lte_memory_card.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Lte memory card design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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