TMURPHY@WPI.BITNET (12/03/88)
> Does anybody know where to get DRAMs for my gsRAM board > at a decent price? All dealers/computer stores I've been > to are charging upwards of $70 for 256k. I know there must be > a mail order place out there that has 'em for less! > > Any help would be appreciated. > > > tom -------> tclark@hawk.ulowell.edu What type of RAM chips? Last I saw (Novenber Computer Shopper), 256K chips seemd to be going for about $13/chip. Tom ________________________________________________________________ Thomas C. Murphy Worcester Polytechnic Institute CAD Lab Mechanical Engineering Dept. BITNET: TMURPHY@WPI Arpanet: tmurphy%wpi.bitnet@talcott.harvard.edu
MSER001@ECNCDC.BITNET (01/17/89)
nec d41256c-15 chips will not work correctly with APW(apples programers- workshop, but HM50256-15 or mcm6256BP10 will work, if you are not using apw, you may get by with any 150ns chips, but if your not certain, ask if you can take them back quickly if they don't work \
gwyn@smoke.BRL.MIL (Doug Gwyn ) (01/18/89)
In article <8901161602.aa17572@SMOKE.BRL.MIL> MSER001@ECNCDC.BITNET writes: >... if you are not using apw, you may get by with any 150ns chips, ... Mind explaining what APW has to do with it?
neilhncc1701d@pro-cyon.UUCP (Neil Haldar) (04/29/89)
Ok...
Enough of the dead Mac talk... more vaporware is my guess... (?)
A little while back, someone mentioned Microprocessors Unlimited for
buying RAM chips @ $7.50...
I just got off the phone with them, and they said I can get the chips for
$7.25... plus a standard shipping charge of $7.50...
The only thing I worry here are that the chips are German-made 'Seaman'
chips. I have a couple doubts about compatibility... someone tell me they're
ok!!!
They are 256x1, 150ns... just like the TI chips we all have...
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DISCLAIMER: Everything I post here is so amazingly bizarre that it simply
_HAS_ to be my opinion.
How much of a bottle of Coke is fizz??
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Neil Haldar, 512 Westover Lane, Mansfield,OH 44906
GEnie: N.HALDAR
UUCP: crash!pnet01!pro-cyon!neilhncc1701d
ARPA: crash!pnet01!pro-cyon!neilhncc1701d@nosc.mil
INET: neilhncc1701d@pro-cyon.cts.com
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"Only human arrogance would assume the message must be meant for man."
- Mr. Spock, Star Trek IVhuang@husc4.HARVARD.EDU (Howard Huang) (11/20/89)
I need to get some more memory for my IIgs, and I have one question: 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 think both should be okay, but I'd like to make sure first. Thanks! Howard C. Huang huang@husc4.harvard.edu huang@husc4.BITNET huang@husc4.UUCP
jjl@typhoon.Berkeley.EDU (Jason J. Lee) (11/20/89)
I have an Apple memory card in my GS with 2 banks of 150ns chips and 2 banks of 100ns chips, and everything works fine, so I guess using 120ns chips would work just as well. I don't know about mixing different chips within each bank though... this might cause a few problems that might not show up in my current setup. jjl@ocf.berkeley.edu
greyelf@wpi.wpi.edu (Michael J Pender) (11/29/89)
In article <3213@husc6.harvard.edu> huang@husc4.UUCP (Howard Huang) writes: > >I need to get some more memory for my IIgs, and I have one question: > > 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. As for using 120s instead of 150s they'd work fine, they're just more expensive than needed.
fiddler%concertina@Sun.COM (Steve Hix) (12/01/89)
In article <5866@wpi.wpi.edu>, greyelf@wpi.wpi.edu (Michael J Pender) writes: > In article <3213@husc6.harvard.edu> huang@husc4.UUCP (Howard Huang) writes: > > > >I need to get some more memory for my IIgs, and I have one question: > > > > 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. ------------ "...Then anyone who leaves behind him a written manual, and likewise anyone who receives it, in the belief that such writing will be clear and certain, must be exceedingly simple-minded..." Plato, _Phaedrus_ 275d
jb10320@uxa.cso.uiuc.edu (Jawaid Bazyar) (12/02/89)
In article <128663@sun.Eng.Sun.COM> fiddler%concertina@Sun.COM (Steve Hix) writes: >In article <5866@wpi.wpi.edu>, greyelf@wpi.wpi.edu (Michael J Pender) writes: >> In article <3213@husc6.harvard.edu> huang@husc4.UUCP (Howard Huang) writes: >> > >> >I need to get some more memory for my IIgs, and I have one question: >> > >> > 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. > Here's a story for ya. I have an Applied Engineering GS-RAM rev. D which had 1meg of 150ns 256k chips on it. It worked fine. I bought a bank of 120ns chips after consulting with AE (they said it would work). It didn't. Most of the 150ns didn't work when I had the 120ns chips installed. After a lot of headaches, I finally got some more 120ns RAM, but in the process I discovered an interesting fact about the GS RAM. You can't mix chips of different speeds in a particular column. Here's a diagram. Column 1 Column 2 x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x i.e. Each column must contain chips of the same speed. I imagine the problem is a timing glitch caused by AE's proprietary bank selection logic, the logic that allows DMA access to 6 banks of memory, even though the memory slot only directly supports four banks. If you've got a GS RAM and are going to be adding memory, make sure you buy the same speed you've currently got. Either 150ns or 120ns will work fine. AE recommends 120ns because of all the delay their logic introduces. Apple used 150ns chips on the motherboard. -- Jawaid Bazyar | This message was posted to thousands of machines Junior/Computer Engineering | throughout the entire civilized world. It cost jb10320@uxa.cso.uiuc.edu | the net hundreds, maybe thousands of dollars.
sb@pro-generic.cts.com (Stephen Brown) (12/11/89)
In-Reply-To: message from jb10320@uxa.cso.uiuc.edu I have an AE GS RAM as well. Its a fairly early one, though. I have 150nS and 120nS chips in it (I think 4 rows of 150 and 2 of 120). There are no problems. UUCP: crash!pro-generic!sb ARPA: crash!pro-generic!sb@nosc.mil INET: sb@pro-generic.cts.com
greyelf@wpi.wpi.edu (Michael J Pender) (12/12/89)
[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
rnf@shumv1.uucp (Rick Fincher) (12/14/89)
In article <6209@wpi.wpi.edu> greyelf@wpi.wpi.edu (Michael J Pender) writes: >[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. >> >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. > Since the IIgs determines the maximum time allowed (150 ns) it doesn't really matter what the card supports (except for odd cards like the AE cards that require 120 ns chips because of things they do to get DMA compatibility past 4 rows of chips) as long as it meets the minimum. If faster slots are used in the future, current cards probably won't be compatible anyway. Rick Fincher rnf@shumv1.ncsu.edu
jerryk@pro-tcc.cts.com (Jerry E. Kindall) (12/15/89)
In-Reply-To: message from greyelf@wpi.wpi.edu Re: 120 vs 150 ns chips I recently (a few weeks ago) bought 512K worth of RAM chips from Jameco electronics for my Z-RAM Ultra II. I ordered 150 ns chips (since that was what was on the Z-RAM to begin with), they put "150 ns" on the invoice, but they shipped me 120 ns chips. They work fine, naturally. Didn't cost me any extra, either. _____ ||___|| Jerry Kindall | Internet: jerryk@pro-tcc.cts.com | o | 2612 Queensway Drive | UUCP: nosc!crash!pro-tcc!jerryk |__O__| Grove City, OH 43123-3347 | GEnie: A2.JERRY ALine: A2 Jerry