Dual SKD-4000 (SKD 1)
The Dual SKD-4000 is a 486-based generic/ODM laptop that was released around June 1993. The SKD-4000 has a very modular design. The top right of the system has an expansion bay that could fit several modules, a trackball being the most common.
This laptop was sold under many names, but Dual Technology Corporation is the original manufacturer.
There were many hardware revisions of this laptop. This page covers the first, aka the "SKD-4000 I" or "SKD 1". The SKD-4000 II (aka SKD 2) was mostly identical but added local bus video. The SKD-4000 III (aka SKD 3) added sound hardware along with other changes. There were more revisions after this too, but I'm lacking info on them. They are listed on the Dual homepage though.
"SKD" stands for System Knock Down.
Below is a list of brands I currently know sold it:
- Dual Group branded
- Ypsilon
- LAN Modular Book
- BIT Computer Inc DU ModuleBook
Specifications
| Spec | Details |
|---|---|
| CPU | CPU Type: Socket 2 - Intel 486SX @25MHz - Intel 486DX @25, 33, or 50MHz - Intel 486DX2 @50 or 66MHz |
| Chipset | ACC Micro 2046 |
| RAM | Type: Standard (72-pin?) RAM Slot Standard: 4MB Maximum: 20MB |
| Storage | 2.5" IDE Requires Adapter: Yes Standard: N/A |
| Display Options | - 9.5" Passive Matrix Grayscale @640x480 - 9.5" Passive Matrix Color @640x480 - 9.5" Active Matrix Color @640x480 |
| Graphics Chipset | Chips & Technologies 65520 VRAM: Unknown |
| Audio | PC Speaker |
| Main Battery | Unknown |
| CMOS Battery | Soldered 2330 Lithium |
| Power Supply | Kycon KPPX-4P Connector |
| Media Drives | 3.5" 1.44MB Floppy Drive (Epson SMD-1100) |
| PC Cards | Expansion Bay holds one of the following modules: - Trackball Module - PCMCIA Module - SCSI Module - Modem Module - LAN Module (Ethernet?) - Media Module - Securedata Module - Scanner Module - Serial II Module |
| Networking | Modem (Optional) |
| Other I/O | - 1x Parallel - 1x Serial - 1x VGA Out - 2x PS/2 - 1x Dock Connector |
| BIOS | AMI |
| Pointing Device | Trackball (Optional) |
Resources
CPU Switch Settings
These are only for the SKD 1. If you have a different revision of the SKD-4000, see their respective pages for their switch settings.
| CPU | SW1-1 | SW1-2 | SW1-3 | SW1-4 | SW2-1 | SW2-2 | SW2-3 | SW2-4 |
|---|---|---|---|---|---|---|---|---|
| SX-25 | OFF | ON | OFF | OFF | ON | ON | OFF | - |
| DX-25 | ON | OFF | ON | ON | ON | ON | OFF | - |
| DX-50 | ON | OFF | ON | ON | OFF | OFF | OFF | - |
| DX2-50 | ON | OFF | ON | ON | ON | ON | OFF | - |
| DX2-66 | ON | OFF | ON | ON | OFF | ON | OFF | - |
Page last updated (MM/DD/YYYY): 02/24/2025
Update Reason: added cpu settings
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