MiTAC IH4077D Vintage 486 PCI & ISA Motherboard Combo - Socket 3Includes Intel i486DX2-66 CPU, 8MB 72-Pin SIMM RAM, Heatsink & COM/LPT BracketNO BATTERY ACID CORROSION - Rare 486 Motherboard with Native 32-Bit PCI Slots
A highly collectible, authentic MiTAC IH4077D 486 desktop platform based on the EFAR EC802GL chipset. Features two 32-bit PCI slots alongside classic 16-bit ISA slots, making it one of the most flexible and sought-after boards for 486-era computing.
Unlike common vintage 486 motherboards ruined by leaking VARTA barrel batteries, this board is completely free of acid damage, having utilized an external 3.6V Tadiran lithium battery pack plugged into the board header.
Key Highlights for Retro DOS / Win9X Enthusiasts:- Native 32-Bit PCI Architecture: Run fast, reliable PCI graphics cards (such as S3 Trio64, ATI Mach64, Matrox Millenium) and PCI network adapters without the compatibility headaches or stability issues of VESA Local Bus (VLB).- Pristine PCB Condition: Zero corrosion around the CPU socket, BIOS chip, memory banks, or traces.- Flexible CPU Support: Clear silkscreen jumper table on the PCB for 5V processors as well as 3.3V / 3.45V upgrades (Intel DX4, AMD 5x86).- Complete Hardware Bundle: Includes ceramic Intel 486DX2 CPU, 72-pin SIMM memory, clip-on heatsink, external battery, and dual serial/parallel rear bracket.
Technical Specifications:- Brand / Manufacturer: MiTAC International Corp.- Model: IH4077D (Award BIOS AIT4077D R1.01.01)- Socket Type: Socket 3 (ZIF Socket)- Chipset: EFAR EC802GL Northbridge / EC100G Southbridge- Integrated I/O: UMC UM82C863F / UM82C865F Controller- Keyboard Controller: VIA VT82C42N- Form Factor: Baby AT (Approx. 8.6" x 9.8" / 22 cm x 25 cm)- Power Input: Standard 12-Pin AT Connector (P8 / P9)
Installed Processor:- Intel i486DX2-66 (66 MHz Core / 33 MHz Bus)- Package: PGA Ceramic (marked 8442185FCB A4 GR 05 i66 on gold base)- Internal L1 Cache: 8 KB- Heatsink: Purple anodized aluminum cooler with mounting clip
Memory Configuration:- Installed RAM: 8MB Total (2 x 4MB SMART Modular Technologies 72-pin SIMMs, SM5321000-7FUZ, Made in USA)- Total Sockets: 4 x 72-Pin SIMM Sockets- L2 Cache Sockets: 8 x DIP SRAM Sockets + 1 x TAG SRAM Socket
Expansion & I/O Headers:- 2 x 32-Bit PCI Slots- 4 x 16-Bit ISA Slots- 2 x 40-Pin IDE Interfaces (Primary / Secondary)- 1 x 34-Pin Floppy Drive Header- 1 x 5-Pin DIN AT Keyboard Port
untested. The physical condition is exactly as shown in the provided photographs
