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James Gregory 2013-12-30 20:26:41 +11:00
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[Previous](04-07.html) [Table of Contents](index.html) [Next](04-09.html)
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Wait states exist because the CPU must to be able to coexist with any
adapter, no matter how slow (within reason). The 8088 expects to be able
to complete each bus access—a memory or I/O read or write—in 4 cycles,
@ -134,12 +130,4 @@ the 8088's already-poor memory access performance in half. Running your
code from display memory is sort of like running on a hypothetical
8084—an 8086 with a *4-bit* bus. Not recommended!) Given that your code
and data reside in normal system memory below the 640K mark, how great
an impact does the display adapter cycle-eater have on performance?
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[Previous](04-07.html) [Table of Contents](index.html) [Next](04-09.html)
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* * * * *
Graphics Programming Black Book © 2001 Michael Abrash
an impact does the display adapter cycle-eater have on performance?