Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!wuarchive!mit-eddie!mit-amt!snorkelwacker!spdcc!merk!xylogics!cloud9!jjmhome!m2c!wpi!greyelf From: greyelf@wpi.wpi.edu (Michael J Pender) Newsgroups: comp.sys.apple Subject: Re: RAM chips Message-ID: <6209@wpi.wpi.edu> Date: 12 Dec 89 03:50:32 GMT References: <968@madnix.UUCP> <5866@wpi.wpi.edu> <128663@sun.Eng.Sun.COM> Reply-To: greyelf@wpi.wpi.edu (Michael J Pender) Organization: Worcester Polytechnic Institute, Worcester ,MA Lines: 26 [lots of stuff nuked] >> > Is it all right to use 120ns chips instead of 150ns in the Apple >> > Memory Card? Can you mix the 120 and 150 chips within the same >> > set of 8? >> I wouldn't mix the 120s and 150s on the same set of 8, the 120s >> would get done before the 150s. > >So? They'll just hang around until the system is ready to read from >them. It's not like they'll be told to do something else before the >access is done. They're just kinda hanging around until then. > Let me put it this way. If I have a card with 4 150 nsec chips, and 4 120 nsec chips, I can't drive it at the full speed. If 150 nsec chips are working, don't pay the extra money to put 120 nsec chips on the card with them. If the card provides for being driven faster than the 150 nsec chips can move, stick to 120 nsec chips. That is, don't pay for a feature you aren't making use of. However if you are getting as many 120nsec chips as you want for the same price, let me know how you're doing it :^) --- Michael J Pender Jr Box 1942 c/o W.P.I. ... (Mankind) has already greyelf@wpi.bitnet 100 Institute Rd. used its last chance. greyelf@wpi.wpi.edu Worcester, Ma 01609 - Gen. MacArthur