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DEC M7555 Rd Disk Controller
- Controller for DEC PDP-11 systems
- Model designation: M7555
- Manages RD disk drives (RD03/RD04/RD05)
- Connects via the Unibus
- Handles read/write operations for removable disks
- Facilitates disk I/O for storage
- Supports high-capacity disk storage for its era
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Product Overview
The DEC M7555 Rd Disk Controller is a hardware component from Digital Equipment Corporation designed for their PDP-11 computer systems. It manages the operation of the RD03/RD04/RD05 series of removable disk drives, enabling data storage and retrieval.
Technical Information
| Brand | DEC |
| Model | M7555 |
| Type | Rd Disk Controller |
Additional Specifications
| Bus | Unibus |
| Drive Compatibility | RD03/RD04/RD05 Removable Disk Drive |
Product Description
The DEC M7555 Rd Disk Controller is a key interface card for Digital Equipment Corporation's PDP-11 minicomputer systems, specifically designed to manage the operation of the RD03, RD04, and RD05 series of removable disk drives. These drives were significant for their time, offering substantial storage capacity compared to floppy disks. The M7555 controller connects to the PDP-11 via the Unibus, the system's primary data and address bus. This controller is responsible for the complex task of interfacing the computer with the electromechanical workings of the RD disk drives. It handles all aspects of data transfer, including seeking to the correct track, rotating the disk platter to the correct sector, reading data from or writing data to the magnetic surface, and performing error checking and correction. It translates high-level disk commands from the operating system into the precise low-level signals required by the drive. In essence, the DEC M7555 Rd Disk Controller was crucial for enabling the use of high-capacity removable disk storage on PDP-11 systems. It provided the necessary hardware bridge for reliable and efficient data access, supporting applications that required significant storage capabilities beyond what was available with earlier storage media.
