LIM 4.0 focused EMS board and backplane line for pre-386 platforms, designed for deterministic page-frame mapping and predictable software compatibility.

Standard

LIM EMS 4.0 page-frame compatibility

Frame Windows

D000h and E000h profile sets

Capacity Range

2MB to 8MB banked architecture

Configuration

Register maps with conflict-safe presets

Validation Suite

Lotus 1-2-3, QEMM, DOS extender scenarios

Deployment Form

Single-card and modular backplane builds

The Amstrad PC1640 was the successor to the hugely popular PC1512, launched in 1987 with 640KB RAM and an EGA-compatible graphics chipset from Paradise Systems integrated on the motherboard. The 1640DD variant shipped with two 360KB 5.25-inch floppy disk drives. Also marketed as the PC6400 in the United States and sold under the Schneider brand in Germany, it was one of the most successful IBM PC compatibles in Europe and helped open the consumer PC market.

CPU

Intel 8086 @ 8 MHz

Co-processor Socket

Intel 8087 math co-processor (optional)

RAM

640 KB (on-board)

Storage

Dual 360 KB 5.25-inch floppy disk drives (DD model)

Graphics

EGA-compatible (Paradise Systems chipset), CGA and Hercules modes supported

Display

Colour (ECD) or monochrome monitor; ECD model supports full EGA modes

Sound

PC speaker with physical volume control

Expansion

Three full-length 8-bit PC/XT ISA expansion slots, supports optional VGA board

I/O Ports

RS-232C serial, Centronics parallel, light pen connector

Input Devices

Full QWERTY keyboard with Atari joystick port, two-button Amstrad mouse

Dimensions

372 x 284 x 135 mm

Weight

7.75 kg (DD model)

Power Supply

Integrated into monitor housing

Operating System

MS-DOS 3.2, Digital Research DOS Plus (CP/M compatible)

Bundled Software

GEM Desktop, GEM Paint, Locomotive BASIC 2

Manufacturer

Amstrad plc (Brentwood, Essex, UK)

Released

1987

Also Known As

Schneider PC1640, Sinclair PC500, PC6400 (US)