craig@ernie.Rosemount.COM (Craig Taylor) (05/21/91)
I have some old 150ns 256x1 DRAMs and was considering picking up a 12Mhz AT motherboard and using them. What speed must the DRAMS be for a 12Mhz AT? Are wait states usually jumperable on the mother- board? Is there a simple formula to use to determine the required speed? Can slow memory chips be used as extended memory on a RAM card with a fast AT? Any help appreciated. Craig Taylor craig@ernie.rosemount.com
phil@brahms.amd.com (Phil Ngai) (05/23/91)
craig@ernie.Rosemount.COM (Craig Taylor) writes: >I have some old 150ns 256x1 DRAMs and was considering picking up >a 12Mhz AT motherboard and using them. What speed must the DRAMS >be for a 12Mhz AT? Are wait states usually jumperable on the mother- >board? Is there a simple formula to use to determine the required >speed? Can slow memory chips be used as extended memory on >a RAM card with a fast AT? Any help appreciated. I have some gasoline and was considering buying a four door car to put it in. For some reason, I don't want to ask the person selling me the car about technical and highly variable information so I'm going to ask the world how much gasoline I should put into the car. Oh, and I won't tell you which car it is either. It might be a 4 cylinder car or an 8 cylinder car. It might have a radio, it might not. If the gasoline isn't right for the car, can I use it in a motorcycle? -- For the Welfare system to flourish, its clients must not. Conflict of interest?
whitney@reed.cs.unlv.edu (Lee Whitney) (05/29/91)
To answer your question, you would be better off using your RAM for an XT (8086 based) computer. 150ns is generally too slow for a 286 computer. To Phil who responded to you: If you are saying this was a stupid question, count how many times you have asked a question someone already knew the answer to, and reconsider your judgement. Just because you may have already learned something does not mean that it is then stupid for anyone else to learn it. If everyone on the net tries to help a little rather than mock someone trying to learn, we can have most of our questions answered. If you did not have intentions of ridicule, please disregard the above note and enlighten us as to the meaning of your wit.
phil@brahms.amd.com (Phil Ngai) (05/29/91)
whitney@reed.cs.unlv.edu (Lee Whitney) writes: >To answer your question, you would be better off using your RAM for an >XT (8086 based) computer. 150ns is generally too slow for a 286 >computer. Gosh, I guess C&T must be lying when they say on the front of their CS8221 NEW ENHANCED AT DATA BOOK that they support 12 MHz operation with 150 ns DRAMs. But then, you probably don't know what page mode or interleave operation are. In fact, I'd be willing to bet a dollar that you've never even read the C&T NEAT data book. >If everyone on the net tries to help a little rather than >mock someone trying to learn, we can have most of our questions >answered. Yes, and with answers like yours, whose relationship with reality is only accidental. Any answer is better than no answer, whether or not it is correct? -- The media is in the business of distorting people's perception of reality, by emphasising the out of the ordinary.
whitney@reed.cs.unlv.edu (Lee Whitney) (05/30/91)
whitney@reed.cs.unlv.edu (Lee Whitney) writes: >>To answer your question, you would be better off using your RAM for an >>XT (8086 based) computer. 150ns is generally too slow for a 286 >>computer. Phil writes: >Gosh, I guess C&T must be lying when they say on the front of their >CS8221 NEW ENHANCED AT DATA BOOK that they support 12 MHz operation >with 150 ns DRAMs. But then, you probably don't know what page mode >or interleave operation are. In fact, I'd be willing to bet a dollar >that you've never even read the C&T NEAT data book. Did I say 150ns RAM would not operate in any 286? No. I said 150ns RAM is generally too slow for a 286, which I still stand behind. Consider this: 1.) Not everone has a 286 board with the features you speak of, and on many 286-12 boards, 150ns memory CAN and HAS caused problems. 2.) Even if the board does have interleaved memory (which, by the way, your on for any monetary bet you would like to wager on my knowledge of this subject) this DOES NOT GUARANTEE that you will get the best performance from your system. If simple memory tricks like that were the end all answer, we would not need more advanced schemes to reduce memory access such as caching and RISC's register based architecture. Under these circumstances I feel the original answer had a little more than "an accidental relationship with reality". >>If everyone on the net tries to help a little rather than >>mock someone trying to learn, we can have most of our questions >>answered. >Yes, and with answers like yours, whose relationship with reality is >only accidental. Any answer is better than no answer, whether or not it >is correct? My point was not argue answer validity with you, although I will if your goal is to contribute to everyone's knowledge. My point was that even though you are someone who has apparently attained some degree of technical knowledge, instead of helping to answer a simple question, or ignoring it, you chose to try to belittle and make fun of a less experienced user. I cannot see how your initial response was helpful, or even funny.
phil@brahms.amd.com (Phil Ngai) (05/30/91)
whitney@reed.cs.unlv.edu (Lee Whitney) writes: > 1.) Not everone has a 286 board with the features you speak of, > and on many 286-12 boards, 150ns memory CAN and HAS caused > problems. Maybe we should have a show of hands. How many people with a 286 have a C&T NEAT chipset? Oh, I see. NEAT is a really rare and unusual chipset and hardly anyone has it. These people who had trouble, they weren't the kind of people who don't bother to consult with their vendor, are they? > 2.) Even if the board does have interleaved memory (which, by > the way, your on for any monetary bet you would like to > wager on my knowledge of this subject) this DOES NOT > GUARANTEE that you will get the best performance from your > system. If simple memory tricks like that were the end all > answer, we would not need more advanced schemes to reduce > memory access such as caching and RISC's register based > architecture. The way I see it, two answers have been provided here, mine, which is to the effect that "it's complicated and depends on a lot of stuff, your vendor is the best source of info", and yours, which is "no, it won't work. well, ok, after Mr. Ngai complained about my answer, I'll change it to be sometimes it works and sometimes it doesn't. actually, it's complicated, but I think you shouldn't do it" >I cannot see how your initial >response was helpful, or even funny. What can I say, other people did. -- The media is in the business of distorting people's perception of reality, by emphasising the out of the ordinary.