Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uwm.edu!bionet!agate!ucbvax!bloom-beacon!eru!hagbard!sunic!dkuug!ideal!wp From: wp@iddth.id.dk (Wiesiek Pawlowski (900415#GUEST)) Newsgroups: comp.sys.ibm.pc.hardware Subject: Are there DIFFERENT 100ns DRAM chips? Keywords: memory, RAM, DRAM Message-ID: Date: 19 Apr 91 15:25:48 GMT Sender: news@ideal.id.dk (Nick Sandru (news adm)) Organization: Dept. of Computer Science Lines: 28 Nntp-Posting-Host: iddth2 Hello, one of my friends has bought a 386SX/16MHz system resently and he has some strange problems with it. The computer simply "hangs" from time to time without any explicit reason. My friend has a conjecture about it. He thinks that the problem is caused by improper DRAMs. The documen- tation of the motherboard says that the system should use "100ns fast page mode DRAMs with the following critical DRAM specifications: tCAS<=35ns, tCAC<=35ns, tCP<=20ns". and then it "explains" the terminology: tCAS - CAS pulse width tCAC - CAS access time tCP - CAS prechage time What are these parameters? What do they mean? Does it mean that there are different 100ns DRAM chips? Are they marked with these additional parameters? I mean - is it written on the chip that it has tCAS<=35ns for example? Totally confused, Wiesiek.