Epson NB3s E9450U 386SX Laptop 1MB RAM 8/16MHz 387SX Socket Parallel Serial

Epson NB3s E9450U 386SX Laptop 1MB RAM 8/16MHz 387SX Socket Parallel Serial

The Epson NB3s is an early-1990s DOS-era portable computer built around the Intel 386SX processor with a user-selectable clock speed of 8 or 16 MHz. It features 1MB of onboard RAM, an optional expansion to 2MB or 5MB, and a socket for the 387SX floating-point co-processor. The NB3s was part of Epson's NB-series laptop line produced by Seiko Epson Corp. and was designed for business portability during the peak of DOS computing.

Specifications & What's Included

• Manufacturer: Seiko Epson Corp.
• Model: NB3s
• Part Number / Model Code: E9450U
• Code: A062001
• Processor: Intel 386SX
• Clock Speed: 8 MHz / 16 MHz (user-selectable)
• RAM: 1 MB installed
• RAM Expansion: 2 MB or 5 MB optional expansion
• Co-Processor: Socket for 387SX numeric co-processor (not included)
• External Ports: Parallel port, DB9 serial port
• Storage: Internal floppy drive bay (visible in photos)
• Display: Built-in LCD screen with tilt-adjust hinge
• Power: DC 10V, 1.7A (compatible adapter: Epson AD1220WA — not included)
• FCC ID: BKME94501
• Country of Manufacture: Taiwan (Made in Taiwan R.O.C.)
• AC adapter not included — requires Epson AD1220WA (DC 10V, 1.7A)

Applications

The Epson NB3s belongs to the generation of 386SX laptops that dominated business portable computing in the early 1990s. The 386SX — a cost-reduced variant of Intel's 386DX with a 16-bit external data bus — was widely adopted in laptops of this era because it delivered 32-bit software compatibility at a lower price and power draw than the full 386DX, making it well suited to battery-powered portables. Machines like the NB3s ran MS-DOS and early Windows 3.x, and were used for word processing, spreadsheets, and database work in the field. The optional 387SX co-processor socket allowed users to add hardware floating-point acceleration for engineering or financial calculation tasks. Today, the NB3s appeals to vintage computing collectors and enthusiasts who maintain working DOS systems, as well as anyone restoring or studying the early-1990s laptop market. Compatible software includes the full range of DOS applications and Windows 3.0/3.1.