Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!dali.cs.montana.edu!caen!maize.engin.umich.edu!milamber From: milamber@caen.engin.umich.edu (Daryl Cantrell) Newsgroups: comp.sys.amiga.hardware Subject: Re: RAMs for the A3000 Keywords: ZIPs or SIPPs Message-ID: <061+7T=@engin.umich.edu> Date: 25 May 91 14:29:49 GMT References: <1991May17.170845.8740@informatik.uni-erlangen.de> Organization: University of Michigan Engineering, Ann Arbor Lines: 47 In article johns@dworkin.Amber.COM (John Silvia) writes: >There are two types of expansion ram for an A3000. There is PAGE MODE and >STATIC COLUMN mode. The Page Mode chips are 256X4, and the Static Column >chips are1024X4. 8 of either types of these chips are required for the >minimum memory expansion. Size has nothing to do with the DRAM vs. SCRAM classification. Both page mode and static column RAMs are available in 256Kx4 and 1Mx4. >Also, types of chips cannot be mixed in the same system. Either it's all >PAGE MODE or all STATIC COLUMN. Not exactly. If you want the BENEFITS of static column ram, you can't mix them.. >STATIC COLUMN chips offer more storage, and greater speed, and are more >expensive than PAGE MODE chips. Average Static Column pricing is around >$35-$42 per chip. They both offer the same storage capacity. See above. Note that they don't really cost any more than page mode to produce. >It is highly suggested to buy only the STATIC COLUMN chips - SCRAMS allow >the Amiga to use it's fastest operation modes with a minimum of wait states >and such. Yep. [...] >Also, remember that the first meg of fast ram must be moved from it's >sockets in front of the ZIP sockets, into the empty sockets on the opposite >side of the motherboard. These chips retire from fast ram to become the new >extra megabyte of CHIP ram. This MUST be done if updating the total memory >in the machine. There are no jumpers to set. Sigh. Also wrong. If you're upgrading with 256Kx4 parts, you can choose to leave them in place (they're SCRAMs, BTW). The DIP sockets and the first bank of ZIPs are hard-wired to each other (ie, electrically equivalent). -- +---------------------------------------+----------------------------+ | // Daryl S. Cantrell | These opinions are | | |\\\ milamber@caen.engin.umich.edu | shared by all of // | | |// Evolution's over. We won. | Humanity. \X/ | +---------------------------------------+----------------------------+