Description
Western Digital WD1003-WAH 16-Bit ISA MFM Hard Drive Controller WDC 61-000104
The Western Digital WD1003-WAH is a 16-bit ISA MFM (Modified Frequency Modulation) hard drive controller card designed for IBM PC/AT and AT-compatible personal computers of the mid-to-late 1980s. Built around Western Digital's WD11C00C-JU main controller chip, the WD1003-WAH interfaces MFM hard drives using the ST-506/ST-412 standard — the dominant hard disk interface before IDE/ATA became mainstream. The card occupies a full-length 16-bit ISA slot and provides the timing, encoding, and control logic required to operate MFM drives in XT/AT systems.
Specifications & What's Included
- Model: WD1003-WAH
- Manufacturer: Western Digital Corporation (WDC)
- PCB Part Number: 61-000104-00
- Secondary PCB Number: 60-000079-01 (visible on solder side)
- Bus Interface: 16-bit ISA (AT Bus)
- Drive Interface: MFM — ST-506/ST-412 standard
- Main Controller Chip: WDC WD11C00C-JU (©WDC '85, date code 22-02-8832)
- Hard Disk Controller IC: WDC WD2010B-PL (©WDC '84)
- ROM/BIOS Chip: WDC WD1015-PL (©WDC '85)
- Bus Transceiver: Texas Instruments SN74LS245N
- SRAM: UM6116-3
- Crystal Oscillators: Two TOYO 33-04 crystals visible on board
- Form Factor: Full-length ISA expansion card with mounting bracket
- Country of Manufacture: Malaysia
- Included: Controller card only — no drive cables
Applications
The WD1003-WAH was designed for use in IBM PC/AT and compatible systems running MS-DOS, and was a standard controller card in business and personal computers throughout the mid-to-late 1980s. It supports MFM hard drives connected via the ST-506/ST-412 interface — typically drives in the 5–40 MB range common to that era. The WD1003 series from Western Digital was among the most widely deployed MFM controller families of its time, and cards like this one are sought today by vintage PC restorers, retrocomputing enthusiasts, and collectors working to maintain period-correct IBM AT clones, early 286 systems, and similar hardware. Compatible operating environments include MS-DOS and early PC-DOS setups where an ISA MFM controller is required.
Please note: We may have multiple units of this item in stock. The unit you receive may vary slightly from the one shown in the photos. All units are functionally equivalent and inspected to the same standard.
Western Digital WD1003-WAH 16-Bit ISA MFM Hard Drive Controller in used condition. The PCB is visually intact with no obvious physical damage, displaying normal age-related patina consistent with vintage 1980s hardware. All primary components are present and accounted for, including the main WD11C00C-JU controller chip, WD2010B-PL, WD1015-PL ROM, and supporting integrated circuits. This classic ISA controller represents a functional piece of vintage computing history, suitable for retrocomputing enthusiasts and collectors seeking original period hardware.
Warranty Information
Additional Information
Brand: |
Western Digital |
Model: |
WD1003-WAH |
MPN: |
WD1003-WAH |
PCB Part Number: |
61-000104-00 |
Secondary PCB Number: |
60-000079-01 |
Type: |
MFM Hard Drive Controller Card |
SKU: |
8602 |
Bus Interface: |
16-Bit ISA (AT Bus) |
Drive Interface: |
MFM (Modified Frequency Modulation) |
Main Controller Chip: |
WDC WD11C00C-JU (©WDC '85) |
ROM/BIOS Chip: |
WDC WD1015-PL (©WDC '85) |
Secondary Controller Chip: |
WDC WD2010B-PL (©WDC '84) |
Logic IC: |
TI SN74LS245N |
SRAM: |
UM6116-3 |
Compatible With 1: |
IBM PC/AT and AT-compatible computers |
Compatible With 2: |
IBM PC/XT with 16-bit ISA slot |
Compatible With 3: |
MFM hard drives (ST-506/ST-412 interface) |
Form Factor: |
Full-Length ISA Expansion Card |
Country/Region of Manufacture: |
Malaysia |
Condition: |
As-Is / For Parts or Not Working |
Seller Notes: |
Sold as-is for parts or repair; untested. Card only, no cables. |
Condition Notes: |
Western Digital WD1003-WAH 16-bit ISA MFM controller. PCB intact, vintage patina, all chips present. Used condition, vintage computing. |
