Path: utzoo!mnetor!tmsoft!torsqnt!lethe!yunexus!ists!helios.physics.utoronto.ca!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!tut.cis.ohio-state.edu!uoft02.utoledo.edu!grx0644 From: grx0644@uoft02.utoledo.edu Newsgroups: comp.sys.cbm Subject: REU Expansion Message-ID: <1991Feb19.105218.2939@uoft02.utoledo.edu> Date: 19 Feb 91 15:52:18 GMT Lines: 44 I am posting this off of the Commodor@ubvm listserv for Cory, who can not post currently due to some system problems over there. Tony -------------------------------------------------------------------------------- Subj: REU expansion Okay, I posted a couple of questions about this before, but they seemed to fork off into discussions completely unrelated and I never even got an acknowledgement of the major content of the questions (as far as any sort of answer to the questions). So hopefully this time, someone can help me out. Okay, I got a 1700 REU from someone (he may let me keep it FREE). I want to upgrade it to 512k since 128k is useless with GEOS and not much better with anything else. I did use it for a 128k expansion for a while but things I did with it didn't work quite right. DesTerm didn't like it. Maverick and Copy II 64/128 copies made with it didn't work. Other problems. I checked it with the Maverick REU checker and it told me the REU was bad. So my first (and most important question) is this: Would it most likely just be a bad DRAM chip or could it be the controller chip? If it's just the DRAM then upgrading should give me a good 512k right? But if it's the controller, can I get a new controller chip to use with the new 512k? If so, where and how much? I REALLY want to upgrade this to a 512k rather than buying a new 1750 clone since the 1700 is FREE (or at least VERY cheap) and I can get the chips to upgrade for about $15 (maybe less) through an Electrical Engineering professor. THANK YOU VERY MUCH FOR ANY HELP ON THIS. Second question (and just curiosity): If all we have to do to upgrade to 512k is to replace the chips that were there with 256k chips, then why do we have to go through all that trouble to go beyond 512k? Why can't one just buy 512k chips to get 1MEG or 1MEG chips to get 2MEG? I don't know anything about how this stuff works other than enough to do the replacement of the chips so if anyone can tell me this, I'd appreciate it. Thanks again. Doctor WHO (Cory Hug) 83882319@UWPLATT - Bitnet 83882319@UCS.UWPLATT.EDU - Internet Brought to you by Super Global Mega Corp .com