Western Digital WD1003S-WA4 MFM ISA FLOPPY & HARD DISK DRIVE CONTROLLER PC AT
The Western Digital WD1003S-WA4 is a 16-bit MFM (Modified Frequency Modulation) floppy and hard disk controller for ISA bus systems, supporting multiple drives and configurable I/O ports.General DescriptionThe WD1003S-WA4 is an expansion card designed to manage floppy and MFM hard drives on vintage PCs. It connects via an ISA bus and allows integration of both storage types on a single interface card. The controller supports 16-bit MFM data transfer and provides external connectivity for serial and parallel devicesstason.org+1.Connections and PortsThe card includes multiple connectors for comprehensive interfacing:

• 34-pin control cable connector for hard drive (CN1)
• 20-pin data connectors for drive 0 and drive 1 (CN2, CN3)
• 34-pin data connector for floppy drive (CN4)
• 4-pin LED connector to indicate drive activity (CN5)
• DB-9 serial port connector (external, CN6)
• DB-25 parallel port connector (external, CN7)

These ports allow the controller to handle both internal and external drives, as well as serial and parallel peripheral devicesstason.org.Jumpers and ConfigurationThe WD1003S-WA4 provides user-configurable jumpers for setting port addresses and enabling or disabling devices:

• Floppy drive port address: 3F0-3F7h or 370-377h; option to disable floppy drive
• Hard drive port address: 1F0-1F7h or 170-177h
• Parallel port: LPT1, LPT2, or disabled
• Serial port: COM1, COM2, or disabled

This flexibility permits the controller to adapt to various system configurations and resolve address conflicts with other devicesstason.org.Technical Specifications

• Interface: 16-bit ISA expansion card
• Supported Drives: MFM hard and floppy drives
• Controller Type: Multi-port storage controller
• May include support for power connectors for the drives2
• Date of Manufacture: Circa 1987, making it a legacy vintage component suitable for retro computing enthusiasts1
• • Usage and AvailabilityThe WD1003S-WA4 has become a collectible item for vintage computer restoration. Refurbished units and replacement cards are occasionally available from specialty sellers and online marketplaces such as or retro computing stores+1. It may not include drivers or installation CDs, so users often rely on existing system BIOS support or legacy software for full functionalityMemory4Less.com.Regulatory and Documentation InformationThe controller is FCC-certified under EU4WD1003S-WA4, providing standard compliance information, test reports, and reference documentation for technical and regulatory purposesfccinsights.com+1.In summary, the WD1003S-WA4 is a versatile vintage storage controller for ISA-based PCs, capable of managing both floppy and hard MFM drives with configurable ports and jumpers, making it ideal for retro computing and hardware restoration projects.
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