Description
DTC 5280 CRA 16-Bit ISA MFM Hard Drive Floppy Controller Card Rev B HDD FDD
The DTC 5280 CRA is a full-length 16-bit ISA expansion card designed to interface MFM (Modified Frequency Modulation) hard drives and floppy disk drives with IBM PC/AT-compatible systems. MFM was the dominant hard disk encoding standard for PC/AT systems throughout the mid-to-late 1980s, and dedicated combo controller cards like this one were required to manage both the hard drive and floppy subsystems on a single expansion slot. The board carries Assembly Revision B per the label visible on the PCB.
Specifications & What's Included
- Model: DTC 5280 CRA
- Assembly Revision: Rev B
- Bus Interface: 16-Bit ISA (AT)
- Drive Interface: MFM (Modified Frequency Modulation)
- Supported Drive Types: MFM hard disk drive (HDD) and floppy disk drive (FDD)
- Form Factor: Full-length ISA card
- Floppy Disk Controller Chip: Zilog Z0765A00PSC FDC (visible on PCB)
- Logic: PAL16L8 programmable array logic IC (visible on PCB)
- Onboard ICs: Multiple iMD chips and 27128 EPROM visible
- Bracket: Standard full-height ISA bracket, intact
- Included: Card only — no data cables or drive accessories
Applications
The DTC 5280 CRA was designed for IBM PC/AT-compatible desktop computers using the 16-bit ISA bus, prevalent in systems of the mid-to-late 1980s running MS-DOS. It allows a single expansion slot to manage both an MFM hard disk and one or more floppy drives, making it a staple combo controller for XT/AT-era builds and restorations. Today these cards are primarily sought by vintage computer enthusiasts, retrocomputing collectors, and technicians maintaining or restoring period-correct PC/AT systems, IBM clones, and early DOS workstations that require MFM drive support. Compatible systems include IBM PC/AT, and a wide range of AT-compatible machines from manufacturers such as Compaq, Tandy, and generic AT clones of the era.
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.
This DTC 5280 CRA 16-Bit ISA MFM Hard Drive and Floppy Controller Card has been inspected and appears to be in good used condition. The PCB is clean and green with no visible cracks, burns, or broken traces. Normal light wear consistent with prior installation and removal from a PC/AT system is present. The bracket is intact and the ISA edge connector contacts appear clean. This card has not been bench-tested or powered at our facility; it is sold as a used surplus component. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
DTC (Diversified Technology Corp) |
Model: |
5280 CRA |
MPN: |
5280 CRA |
Type: |
ISA MFM Hard Drive & Floppy Controller Card |
SKU: |
10252 |
Bus Interface: |
16-Bit ISA (AT) |
Drive Interface: |
MFM (Modified Frequency Modulation) |
Supported Drive Types: |
MFM Hard Drive, Floppy Disk Drive (FDD) |
Assembly Revision: |
Rev B |
Controller Chipset: |
Zilog Z0765A00PSC FDC |
Form Factor: |
Full-Length ISA Card |
Condition: |
Used – Inspected |
Compatible With: |
IBM PC/AT and compatible 16-bit ISA systems |
Country/Region of Manufacture: |
United States |
Seller Notes: |
Card only; no cables or drive accessories included. |
Condition Notes: |
DTC 5280 CRA 16-bit ISA MFM controller card. PCB is clean with no visible damage; bracket intact. Not bench-tested at our facility. Sold as used surplus. Contact us with questions. |
