DEC GT40

DEC GT40 is an VT11 vector graphic terminal produced by the Digital Equipment Corporation, first introduced in October, 1972 (selling for “under $11,000”).^[1]

The DEC GT40 consists of:^[2]

• CPU: KD11-B (PDP-11/05)
• VT40 display processor, including bootstrap ROM (same modules as VT11, but instead of the four-slot backplane, this has a nine-slot backplane to include the CPU and memory)
• MM11-L 8K word core memory (MM11-K 4K word core memory on GT40-Bx models)
• DL11-E asynchronous line interface
• LK40 keyboard
• VR14-LC X-Y monitor (or -LD for 230V)
• 375 light pen

Because the VT11 contained a PDP-11 class computer, the terminal could also serve as a computer in its own right, in fact, IEEE Computer wrote:^[1]

The GT40 may be used either as a stand-alone graphics system or as a remote terminal interacting with various types of host computers. John Mucci, marketing manager for the DEC graphic-11 group, sees the GT40 being particularly useful in the areas of graphic research, design, engineering, architecture business information systems and many other uses needing a fast, low-cost graphics display.

In a stand-alone configuration, the PDP-11/10 within the terminal can be expanded with additional memory and any PDP-11 family peripheral to build as complex a system as necessary. “In fact, the central processor used in the GT-40 can be any PDP-11 family processor,” says Mucci, ”since the display processor is interfaced via the PDP-11's Unibus.”

See also

• Lunar Lander
• Vectrex
• PDP-11

External links

• brouhaha.com/~eric - VT11 instruction set

References

1. ^ ^{a b} IEEE Computer, 5(6), Nov. 1972, pp. 61–62
2. ^ "DEC GT40 Graphic Display Terminal". http://www.brouhaha.com/%7Eeric/retrocomputing/dec/gt40/.  090509 brouhaha.com

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