Abstract
The design and implementation of an Am29300 microprogrammable computer board, used as a coprecessor to a general-purpose MC68020 microcomputer board, is described. The main purpose is to allow those image processing program modules which are most time-consuming and highly repetitive to be executed by optimised special-purpose microcoded programs on a microprogrammable computer board. High performance microprogrammable processors, from the Advanced Micro Devices (AMD) Am29300 family series, are used in the design. The AMD board gives the user the freedom to microprogram the hardware according to needs, and this feature enables the program to be tailor-made for specific applications. This produces improved performance compared with fixed instruction set computers. The AMD board is used for the multiplication of two (4 × 4) matrices; back-faces removal; and clipping, all of which are involved in three-dimensional (3-D) image generation. Results of a comparative performance analysis with a number of 32-bit processors are presented. The Am29300 microprogrammable system has been tested by displaying various 3-D objects on the screen. Both hardware design and software implementation is discussed followed by application examples.
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