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Show Page 8 with the PGP. Pixel, rectangle, arid absolute and relative Evans and Sutherland needs to redesign their frame buffer in order to compete in price and performance with newer, competitive products, especially when more than eight bits per pixel are desired. GENISCO COMPUTERS Cenisco was able to quote a good 12 bit mapped color system at about $40,OO. Unfortunately, it was not capable of real color (RCB) and would have been somewhat more expensive with 24 bits of memory. The Genisco system. include a fast (150 nsec) 16-bit programmable Graphics Processor, which handles host computer data and frame buffer memory update. The PGP is a general purpose computer. Graphical instructions passed from the host are interpreted by subroutines of the executive routine supplied vector writing instructions are supported. An unfortunate design drawback is the single-ported memory, which prevents the PGP from updating the frame buffer during screen refresh. A large number of options are available in configuring the hardware, including a good scroll. pan. and zoom card. The. system documentation supplied by Genisco is very good. |
