Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!iuvax!bobmon
From: bobmon@iuvax.cs.indiana.edu (RAMontante)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Extended memory board and RAM speed...
Message-ID: <23159@iuvax.cs.indiana.edu>
Date: 10 Jul 89 20:35:05 GMT
References: <5876@rpi.edu> <23080@iuvax.cs.indiana.edu> <5456@pt.cs.cmu.edu>
Reply-To: bobmon@iuvax.cs.indiana.edu (RAMontante)
Distribution: na
Organization: malkaryotic
Lines: 14


ralf@b.gp.cs.cmu.edu (Ralf Brown) <5456@pt.cs.cmu.edu> :
-
-Actually, a wait state means a *third* clock cycle.  8086's take four clocks
-per memory access, which is slow enough that I've never heard of a PC or XT
-with wait states (though I've seen a number advertised as having 0 wait 
-states--some "feature"!).  80286's and 80386's take two clocks per memory
-access, and the new 486 chip has a burst mode that can load the internal cache
-at the rate of one memory read every clock cycle.


Aha.  Thanks....BTW, my Zenith 158 (XT clone) is a 1-waitstate box, at
8MHz.  I think that one of the changes made to its Z-159 successor was
to go to no waitstates.