Sun Microsystems 270-1902-04 Differential SCSI Host Adapter Card SBus Module

Sun Microsystems 270-1902-04 Differential SCSI Host Adapter Card SBus Module

The Sun 270-1902-04 is a Differential SCSI host adapter card designed for the SBus expansion slot found in Sun Microsystems SPARC-based workstations and servers. It provides a high-voltage differential (HVD) SCSI interface for connecting external SCSI storage devices and arrays, alongside a TP (twisted-pair) port on the bracket. The board revision is REV 50, as printed on the PCB silkscreen.

Specifications & What's Included

• Manufacturer: Sun Microsystems
• Part Number: 270-1902-04
• Hardware Revision: REV 50
• Bus Interface: SBus (Sun workstation expansion bus)
• SCSI Type: High-Voltage Differential (HVD) SCSI
• Front Bracket Connectors: 68-pin Differential SCSI connector, RJ-45 TP port
• Form Factor: SBus plug-in module / card
• PCB: Green multi-layer board with AMD and secondary SCSI controller ICs visible
• Included: Card only — no cables or SBus slot was Sun Microsystems' proprietary 32/64-bit expansion bus, used across a wide range of SPARC workstations and servers from the late 1980s through the mid-1990s — including the SparcStation 1, SparcStation 2, SparcStation 10, SparcStation 20, SPARCserver 600MP series, and related systems. Differential SCSI (HVD) was favored in workstation and server environments of this era for its ability to support longer cable runs and better noise immunity compared to single-ended SCSI, making it well suited to connecting external disk enclosures, tape libraries, and RAID arrays. This card is typically sought today by engineers and collectors maintaining legacy Sun SPARC hardware, or by organizations running vintage Sun workstation environments that still require original SBus peripheral cards.
  Condition: Used
  This Sun Microsystems 270-1902-04 Differential SCSI SBus Host Adapter Card has been inspected and appears to be in good used condition. The PCB is clean with no visible damage, broken traces, or missing components. The bracket and connectors show normal wear consistent with prior installation in a Sun workstation. Please view our photo set and contact us if you have any questions. Please note: We have multiple units in stock — yours may not be the one shown in the photos, however, it will be similar in condition and function. Visit Our Store

  Shop industrial, solar, scientific, vintage computing, electronic test, audio-visual, office equipment, and manuals in our store. Start shopping »

  Follow Our store

  Want first pick on new arrivals? Tap Save Seller at the top of any page — alerts you the moment we list something new.

  Fast Shipping

  We ship via most standard carriers. Local pick-up available at our Ventura, CA warehouse.

  About Us

  Questions? Contact us anytime. Learn more about us »

  Best Offers

  Want to make an OFFER but don't see a MAKE OFFER button? Use the Contact Seller button at the top of this listing.

  30-Day Guarantee

  100% satisfaction guaranteed. Any issue, just reach out — we'll make it right.

  Thank you for shopping with us.