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Several designs have tried to capitalize on the rudimentary refresh-capabilities of the Tektronix 4014/4015 display terminal by augmenting the hardware with a microprocessor and program and display memory. This paper scrutinizes the existing implementations and offers an alternative based on a Zilog Z80 as the heart of the display processor, a direct-memory access channel to the display terminal for picture data transfer, and a parallel I/O interface between display processor and host computer. In a second stage this alternative will be extended with hardware to support coordinate transformations. This hardware is centered around an AM2903 bit-sliced microprocessor. This collection of hardware enhancements is such that the shortcomings in most existing designs are circumvented and the load on the host computer is minimized. It provides flexible refresh capabilities with selective update, limited possibilities for matrix transformation, as well as display support for storage graphics, at affordable prices.

An improved economic design for a display processor intermixing refresh and storage graphics