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| DECmate | |
|---|---|
| Manufacturer | Digital Equipment Corporation |
| Family | PDP-11 |
| Type | Minicomputer / Microcomputer |
| Released | 1980s |
| Discontinued | 1990s |
| Os | RSX-11, RSTS/E, RT-11, VTOS |
| Cpu | DEC J-11 microprocessor, LSI-11 |
| Memory | up to several megabytes |
| Storage | floppy disk, hard disk |
| Display | VT100, CRT |
DECmate was a line of personal computers produced in the 1980s by Digital Equipment Corporation for use in office automation, laboratory environments, and as terminal-host systems. Combining elements of the PDP-11 architecture with custom firmware and integrated word-processing capabilities, the systems bridged minicomputer design and desktop form factors and were positioned alongside VAX and MicroVAX products. Target markets included installations in United States, United Kingdom, Germany, and other industrialized regions where DEC had established reseller and maintenance networks.
The product family integrated a modified PDP-11 instruction set via microprocessor implementations such as the J-11 and LSI-11, aiming to provide compatibility with existing RSX-11 and RT-11 environments while offering turnkey solutions for office tasks. Intended competitors in contemporary markets included offerings from IBM, Apple Computer, Compaq Computer Corporation, and Hewlett-Packard. Primary distribution channels were DEC sales divisions, in-company sales to laboratories and universities, and third-party resellers that supported local area network integration and custom peripheral expansions.
The internal architecture reused concepts from the PDP-11 family, employing 16-bit register sets, memory management units, and bus designs derived from established minicomputer practice. Central processing used microprocessors implementing UNIBUS-compatible or Q-bus-like interfaces, facilitating interoperability with peripheral controllers from DEC and aftermarket vendors. Memory configurations ranged from kilobyte-scale ROM for boot/firmware to megabyte-scale magnetic core or semiconductor RAM backed by battery serialization for field service units. Chassis designs often included integrated keyboards, CRT displays compatible with VT100 escape sequences, and internal bays for removable storage media standardized by DEC accessory lines.
Firmware provided keyboard-driven control panels and bootstrap loaders linked to system firmware images stored in ROM or EPROM devices sourced from suppliers like Intel and Texas Instruments. Supported operating systems included variants of RSX-11, RSTS/E, and single-user oriented RT-11, adapted to run atop the system microcode and to manage file systems on the available mass storage. Terminal emulation and word-processing firmware were frequently bundled with specialized editors and utilities derived from DEC's software libraries; these components interfaced with peripheral device drivers and the system console firmware.
Expansion options encompassed internal and external devices such as floppy disk drives, Winchester-style hard disks, parallel and serial ports compatible with RS-232C, and printer interfaces supporting DEC-branded and third-party impact printers. Networking and interconnect were provided by adapters compatible with Ethernet transceivers and interface modules used in VAXcluster-era environments. Third-party hardware vendors produced graphics adapters, storage controllers, and memory upgrades designed to fit the bus architecture, and maintenance services were provided through DEC field engineers and authorized service centers.
The software environment included word processors, terminal emulators, compilers, and utilities ported from larger DEC systems to the smaller platform to enable office automation, data acquisition, and laboratory control. Languages such as FORTRAN, COBOL, BASIC, and MACRO-11 assemblers were available, alongside database and text-processing packages sold by DEC and independent software houses. Add-on applications supported integration with mainframe and minicomputer back-ends used in research institutions like MIT, Stanford University, and University of Cambridge, while vertical-market vendors produced specialized packages for sectors such as clinical laboratories, manufacturing test benches, and publishing houses.
Though eventually overshadowed by the rise of Intel-based personal computers and the proliferation of Microsoft-centred software ecosystems, the platform served as a transitional architecture that influenced terminal-host design, office automation workflows, and embedded minicomputer practice. Its role in enabling migration paths for PDP-11 software to smaller form factors influenced later products from DEC including the MicroVAX line and informed third-party emulator and preservation efforts by computing history groups. Surviving units and software images are preserved by museums and communities that document the evolution of minicomputing and office systems from the late 20th century.
Category:Digital Equipment Corporation computers Category:Minicomputers