486 mainboard Elitegroup ECS-UM8810PAIO Rev.2.1
| Technical details | |
| Name: | ECS-UM8810PAIO Rev.2.1 |
| Company: | Elitegroup |
| Chipset: | UMC UM8886F, UM8881F |
| CPU socket: | ZIF-Socket 3 |
| CPU: | Intel Overdrive 486 DX2ODPR66 at 5V |
| Memory: | 4x PS/2 SIMM socket |
| Bus: | 4x PCI, 4x ISA 16 bit, 2x VLB |
| Connectors: | AT power, Keyboard, front-module pins, dual IDE, Floppy, serial, parallel |
| Form factor: | Baby-AT |
| Manufactured: | 1995 |
The board has 256 kB L2 Cache, a CMD640 PCI IDE controller and supports an optional 3.3V voltage regulator module for later 486 CPUs. It uses an Dallas RTC and has an Phoenix 486 PCI PnP BIOS 4.04. A maximum of 128 MB RAM is supported. The chipset and BIOS supports Write-Back caching.
The CMD640 PCI IDE controller has a hardware bug that can corrupt data when using HDD and another device as Floppy simultaneously. Later OS such as Windows 95 have a workaround for this bug included. This however reduces performance by 10%.
