Digital DEC RA92 I/O R/W Board 5417771 70-229H2-02 w/ 17-01547-01 Cable Assy

Digital DEC RA92 I/O R/W Board 5417771 70-229H2-02 w/ 17-01547-01 Cable Assy

This is the Digital I/O Read/Write board pulled from a DEC RA92 hard disk drive. The RA92 was a high-capacity 5.25-inch full-height Winchester disk drive produced by Digital Equipment Corporation (DEC) for use in VAX and other DEC minicomputer systems. This large multi-layer PCB serves as the primary I/O and read/write control assembly for the drive, housing the read/write channel circuitry, logic control ICs, and interface electronics that manage data transfer between the disk platters and the host system. The board carries several alternate Digital part numbers and ships with the associated Cable Assy Jumper.

Specifications & What's Included

• Manufacturer: Digital Equipment Corporation (DEC)
• Board Type: Digital I/O Read/Write (R/W) Board
• Parent Drive: DEC RA92
• Primary Part Number: 5417771
• Assembly Number: 70-229H2-02
• Board Marking: 5017770-01-H1-P1, Side 1 L1
• Alternate Part Numbers: 5417769, 5017768-01 H1-P4, 26891-068101, Digital SG-2
• Included: Digital 17-01547-01 Cable Assy Jumper (Rev C1, MFG CES ULE66993)
• Form Factor: Large format multi-layer PCB in drive carrier frame
• Visible features: Multiple read/write channel sub-assemblies with cylindrical capacitors, dense IC population on reverse side, SCSI-style edge connector, ribbon cable header, blue jumper block

Applications

The DEC RA92 was introduced in the late 1980s as one of Digital Equipment Corporation's high-density disk drives, offering storage capacity in the range of several hundred megabytes and designed to connect to DEC's DSA (Digital Storage Architecture) bus. It was used in VAX 6000, VAX 8000, and other mid-range and large DEC minicomputer configurations, as well as in DEC storage subsystems such as the HSC series controllers. The RA92 drive family was a staple of DEC data center installations through the early 1990s. This I/O R/W board is sought after today as a spare or replacement part by maintainers keeping legacy DEC VAX systems operational, as well as by collectors of vintage DEC hardware. Given the scarcity of RA92-compatible replacement electronics, this board is a hard-to-find component for anyone servicing or restoring these systems.