Re: 7200 RAM QUESTION
On 19/01/2005, at 8:48 AM, Peter Hinchliffe wrote: On 18/01/2005, at 12:55 PM, bill parker wrote: Can anyone help with this question? I have been doing a throw out of old computers and salvaged bits from some old 7200 machines. Thus I have the RAM from a 7200/90. Will this be compatible with the 7220/200? Both machines built in 1995. I am obliged to use the latter machine because of its connection to a piece of equipment in a lab. Bill The 7200 and 7220 used different sorts or RAM. In fact, the wonderful (!) 7220 was unique in the RAM it required: no other Mac used the same sort. The 7200 used 168 pin 5V FP DIMMs, while the 7220 used 168 pin 3.3V EDO DIMMs. It is NOT possible to use your 7200 RAM in a 7220. It doesn't do any damage - it just doesn't work. I know, after having been supplied with the incorrect RAM on several occasions when trying to upgrade clients' old 7220s well into the iMac age. Apple Australia (who are now out of the upgrade business , BTW) have been the only source of 7220-compatible RAM for some time. Now, not even they supply it. -- Peter HinchliffeApwin Computer Services If you absolutely have to have RAM for the 7220 you will find that Other World Computing has the Ram listed in their eshop outlet . Note that they say the same RAM is used in 4400 Macs Go to this address ... make sure you get all the link http://eshop.macsales.com/MyOWC/Upgrades.cfm? model=29type=MemoryTI=%23TimeFormat%28Now%28%29%2C+shoupgrds=Show+Upg rades Bob
7200 RAM QUESTION
Can anyone help with this question? I have been doing a throw out of old computers and salvaged bits from some old 7200 machines. Thus I have the RAM from a 7200/90. Will this be compatible with the 7220/200? Both machines built in 1995. I am obliged to use the latter machine because of its connection to a piece of equipment in a lab. Bill
Re: 7200 RAM QUESTION
Can anyone help with this question? I have been doing a throw out of old computers and salvaged bits from some old 7200 machines. Thus I have the RAM from a 7200/90. Will this be compatible with the 7220/200? Both machines built in 1995. I am obliged to use the latter machine because of its connection to a piece of equipment in a lab. Bill 7200 built from 1995 to late 96 7220 was introduced early 97 ( if there was a 200Mhz Mac built in 95 I would have hocked my family in to slavery to buy one - as it was I had to wait till 97 to do that when the 7300/200 released at the same time as the 7220) that said and all pedantry aside If I recall they use the same RAM form 172 pin 3.3 volt DIMMS but that the 7220 needed faster memory - going by the tech site 60ns v's 70 ns. If the chips in the 7200 are original apple stock they probably will be the older slower speed of 70 ns otherwise try it and see if it is stable Note that I think 7220 could only go to about 160Mb RAM even with larger memory and I think this is not an Aplle figure based on available chips at the time but an actual hardware limitation (though my recollection is vague as I have only ever came across one or two 7220) -- ~ Mark Secker Computer Support Officer ph#6488 1855 (ECEL) mailto:[EMAIL PROTECTED] University of Western Australia - CRICOS Provider No. 00126G ~ Only he who attempts the absurd is capable of achieving the impossible. - Miguel de Unamuno It takes an idiot to do cool things that's why it's cool - Haruhara Haruka (FLCL) http://ecel-mark.ecel.uwa.edu.au/~marksecker/index.htm (sometimes works)
Re: 7200 RAM QUESTION - NO!!!
From: bill parker [EMAIL PROTECTED] I have been doing a throw out of old computers and salvaged bits from some old 7200 machines. Thus I have the RAM from a 7200/90. Will this be compatible with the 7220/200? Both machines built in 1995. Be careful! I've fried some DIMMs in the past getting caught with this scenario. The RAM the 7200//90 uses are 5v 168 pin FPM DIMMS (70ns) while the 7220/200 uses 168 pin 3.3 Volt EDO DIMMs (60ns). So basically they are pin compatible but not voltage compatible - Very bad design if you ask me. Make sure you DON'T put the EDO RAM from the 7220 in the 7200 as this could fry the motherboard. I don't know whether putting the FPM DIMMS from the 7200 into the 7220 would damage the logic board or the DIMM, but mixing 5v and 3v DIMMs doesn't sound like a good idea to me! Keith or someone should be able to give more details and make sure my info is correct. Ciao! -Mart
