HP 45945-60027 Vectra ES/12 Daughter Board Card Memory Expansion PCB

HP 45945-60027 Vectra ES/12 Daughter Board Card Memory Expansion PCB

The HP 45945-60027 is a daughter board expansion card designed for the Hewlett-Packard Vectra ES/12 personal computer. This type of card plugs into a dedicated expansion connector on the Vectra ES/12 motherboard to extend the system's memory capacity beyond its base configuration. The card is populated with Mitsubishi M5M4464P dynamic RAM (DRAM) ICs arranged in rows across the PCB, a typical architecture for HP Vectra memory expansion cards of this era.

Specifications & What's Included

• Manufacturer Part Number (MPN): 45945-60027
• Compatible System: HP Vectra ES/12
• Type: Daughter board / memory expansion card
• Form Factor: PCB card with card-edge expansion connector
• Main ICs: Mitsubishi M5M4464P DRAM (multiple DIPs populated across board)
• Additional ICs: Multiple smaller DIP logic/support chips visible on top side
• Connector: Card-edge expansion connector, labeled 863 FRONT on PCB silkscreen
• PCB revision marking: A-42L (visible near part number label)
• Board only — no cables or accessories included

Applications

The HP Vectra ES/12 was part of Hewlett-Packard's Vectra line of IBM PC-compatible business desktop computers introduced in the mid-to-late 1980s. The Vectra series was aimed at corporate and professional users and featured proprietary expansion architectures alongside standard ISA slots. Daughter boards like this one were used to upgrade system RAM, a common requirement in that era as software applications grew more memory-demanding and base configurations of 256KB or 512KB quickly became insufficient. The M5M4464P DRAM chips on this board are 64K×4-bit devices, typical of designs from the 1986–1990 timeframe. This card would be of interest to collectors and restorers of HP Vectra ES/12 systems, or to anyone maintaining legacy HP PC-compatible hardware from that generation.