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

Bank-switched memory expansion module tuned for XT, AT, and 286 deployments requiring deterministic mapping, parity instrumentation, and robust coexistence with DMA-heavy workloads.

Capacity Profiles

256KB, 512KB, 1MB address-space maps

Parity Modes

Strict parity enforcement and monitor-only mode

Switching

Hardware DIP plus jumper matrix for deterministic layout

Timing Control

Wait-state presets for weak chipset implementations

Diagnostics Tooling

DOS burn-in suite with map integrity reports

Target Systems

8088, V20, 286, 386SX hybrid benches