Acer 48.58102.001 Socket 5 CPU Board SP54C M3/M5 Intel PCIset ISA PCI

Acer 48.58102.001 Socket 5 CPU Board SP54C M3/M5 Intel PCIset ISA PCI

This is the Acer 48.58102.001 Socket 5 CPU Board, a proprietary processor daughtercard designed for Acer M3 and M5 desktop systems. Marked on the PCB as "SP54C CPU BD" with board revision code 94323-1m, it carries a Socket 5 ZIF processor socket and a dual-chip Intel PCIset (visible S82433LX PCI-to-ISA bridge and S82434LX PCI cache/memory controller), providing the core logic for fifth-generation Pentium-class CPUs. The board slots into the host system via an ISA/PCI edge connector with a vented metal bracket.

Specifications & What's Included

• Part Number: 48.58102.001
• PCB Designation: SP54C CPU BD
• Board Revision: 94323-1m
• CPU Socket: Socket 5 (ZIF, supports fifth-generation Pentium-class processors)
• Chipset: Intel PCIset — S82433LX (PCI/ISA bridge) and S82434LX (PCI cache/memory controller), both visible on board
• Bus Interface: ISA / PCI edge connector
• Compatible Systems: Acer M3, Acer M5 desktop platforms
• Country of Manufacture: Hong Kong (marked on PCB)
• Multiple RAM/cache DRAM ICs visible on board surface
• Includes: CPU board only — no processor, no RAM

Applications

Socket 5 CPU boards like this one were used in mid-1990s proprietary desktop systems where the processor and its core logic were placed on a removable daughtercard rather than integrated directly onto the main planar board. This modular design allowed system builders like Acer to offer CPU upgrade paths within a single chassis. The Intel PCIset (430NX/82433LX + 82434LX) was Intel's first chipset with full PCI bus support, bridging the ISA legacy bus to the emerging PCI standard and supporting Pentium P5-core CPUs running at speeds from 60 MHz up to 133 MHz. These boards are primarily sought today by collectors and technicians maintaining mid-1990s Acer M-series desktop systems, as well as vintage computing enthusiasts restoring period-correct Pentium machines.