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DEC M8256 Rx211 Unibus Quad Rxo2 Controller
- Controller for DEC PDP-11 systems
- Model designation: M8256
- Manages Rx211 floppy disk drive
- Connects via the Unibus
- Quad-height form factor
- Handles read/write operations for Rx02 drives
- Facilitates disk I/O for storage
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Product Overview
The DEC M8256 Rx211 Unibus Quad Rxo2 Controller is a hardware component from Digital Equipment Corporation designed for their PDP-11 computer systems. It interfaces with the Unibus and manages the Rx211 floppy disk drive, specifically handling read/write operations for the Rx02 drive.
Technical Information
| Brand | DEC |
| Model | M8256 |
| Type | Rx211 Unibus Quad Rxo2 Controller |
Additional Specifications
| Bus | Unibus |
| Drive Compatibility | Rx211 / Rx02 Floppy Disk Drive |
Product Description
The DEC M8256, identified as an Rx211 Unibus Quad Rxo2 Controller, is a crucial interface card for Digital Equipment Corporation's PDP-11 minicomputer family. This controller's primary role is to facilitate communication between the PDP-11's central processing unit, accessed via the system's Unibus, and the Rx211 floppy disk drive, specifically supporting the Rx02 drive model. The 'Quad' designation refers to its physical size, occupying four slots on the PDP-11 backplane. This controller handles the low-level operations required to read data from and write data to the floppy disks used in the Rx02 drive. It translates the commands issued by the operating system or application software into the specific electrical signals and timing required by the floppy disk drive mechanism. This includes managing head positioning, data encoding/decoding, and error detection for reliable data storage and retrieval. In essence, the DEC M8256 controller is indispensable for PDP-11 systems that utilize the Rx02 floppy disk drive for program loading, data storage, or system configuration. It bridges the gap between the computer's internal architecture and the external storage device, enabling essential data management capabilities for the era.
