UM386 © 1992 Elitegroup Computer Systems
A premium early-1990s Baby AT motherboard engineered by Elitegroup Computer Systems around the full 32-bit Intel or AMD 80386DX microprocessor running at 25 MHz, 33 MHz, or 40 MHz. The system board is driven by the robust UMC UM82C481 and UM82C482 core logic chipset, offering native support for a dedicated 80387DX math co-processor. To satisfy high-performance desktop computing and early server demands, its expansion real estate relies on a clean rows arrangement of six 16-bit ISA slots and two 8-bit ISA slots. Memory configurations are handled through eight 30-pin SIMM sockets alongside a highly flexible external L2 static cache (SRAM) matrix expandable up to 256 KB.
Full 32-Bit Processing Power: Unlike budget 386SX motherboards of the era that saved manufacturing costs by relying on a narrow 16-bit external data bus, the ECS UM386 features comprehensive 32-bit traces connecting the CPU, the UMC cache controller, and system memory banks. This architecture delivers massive performance gains when executing heavy multitasking or early protected-mode operating systems.
The SRAM Cache Advantage: Because dynamic system RAM (DRAM) speeds lagged far behind the raw clock cycles of a 33 MHz or 40 MHz 386DX processor, the integrated UMC memory controller relies on high-speed static RAM (SRAM) chips. This layout bridges the processing latency gap, dropping system wait-states to zero during standard software loops.