Opcom D.I.A.L. PBX Telephone Answering System Micropolis 1335 MFM Drives

Opcom D.I.A.L. PBX Telephone Answering System Micropolis 1335 MFM Drives

The Opcom D.I.A.L. (Direct Inward Automated Line) is a vintage floor-standing automated PBX telephone answering system manufactured by Opcom of San Jose, California. It was designed to function as an automated attendant and call-processing platform integrated with PBX telephone systems, handling inbound call routing, automated greetings, and message storage. This listing includes the full cabinet system along with two Micropolis 1335 MFM hard drives installed internally.

Specifications & What's Included

• Manufacturer: Opcom, San Jose, CA
• Model: Opcom System D.I.A.L. Type
• Power: 115V AC, 60Hz, 4 Amperes, Single Phase
• Branch circuit requirement: 15A individual branch circuit
• Form factor: Floor-standing lockable cabinet, cream and burgundy finish
• Cooling: Dual rear-mounted cooling fans
• Internal card cage: Numbered slots 2 through 8, populated with yellow and green plug-in line/interface modules
• Ribbon cable interconnects and internal wiring visible and intact
• Rear connectivity: Parallel port connector (visible upper right of rear panel)
• Included Drive 1: Micropolis 1335 MFM Hard Drive — P/N 900435-02-5B, +12VDC / +5VDC, 32W, Made in Singapore
• Included Drive 2: Micropolis 1335 MFM Hard Drive — P/N 900435-02-5A, +12VDC / +5VDC, 32W, Made in Singapore
• Quantity of Micropolis 1335 MFM drives included: 2

Applications

The Opcom D.I.A.L. system was a business telephone automation platform from the 1980s, designed to integrate with PBX telephone switches to provide automated call answering, routing, and voice messaging. Systems like this were deployed in small-to-medium-sized businesses as an early alternative to live receptionists, routing callers to extensions or recording messages using onboard MFM hard drive storage — a technology that predated the SCSI and IDE drives that would replace it by the early 1990s. The Micropolis 1335 is an MFM (Modified Frequency Modulation) hard disk drive, a storage interface standard that was common in business computing systems of the mid-to-late 1980s before being superseded by RLL and then IDE/SCSI interfaces. Today, systems of this type and era are primarily sought by vintage computing and telecom collectors, restoration enthusiasts, or technicians sourcing components for legacy PBX system maintenance. The card modules, MFM drives, and internal assemblies visible in this unit may be of value as spare parts.