Re: Macintosh IIfx SIMMs/Information
At 23:57:33 -0700 on 8/30/05, Gregg Eshelman [EMAIL PROTECTED] wrote: --- Jeff Walther [EMAIL PROTECTED] wrote: Does anyone have a pinout/datasheet for the IIfx/LWNT 64 pin SIMMs? I'm thinking about running off a few homebrew circuit boards If you're thinking of SIMM stackers to put 4 72pin SIMMs into one IIfx slot, that's been done already. As I recall, MicroMac's SIMM Doubler just socketed two 64-pin SIMMs in parallel. You bought four boards (for each bank) and doubled-up your old one, two, four, or eight MG 64-pin SIMMs. Thus you could build 2, 3, 4, 5, 6, 8, 9, 10, 12, or 16 MG SIMMs in each bank for any combination of 4*(A+B) up to 128 MG where A and B are the Doubler capacity or zero. -- Bob Gray Huntingtown MD [EMAIL PROTECTED] -- Vintage Macs is sponsored by http://lowendmac.com/ and... Small Dog Electronicshttp://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac http://lowendmac.com/lists/support.html Vintage Macs list info: http://lowendmac.com/lists/vintagemacs.shtml -- AOL users, remove mailto:; Send list messages to: mailto:vintage.macs@mail.maclaunch.com To unsubscribe, email: mailto:[EMAIL PROTECTED] For digest mode, email: mailto:[EMAIL PROTECTED] Subscription questions: mailto:[EMAIL PROTECTED] Archive: http://www.mail-archive.com/vintage.macs%40mail.maclaunch.com/ iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com
Re: Macintosh IIfx SIMMs/Information
--- Jeff Walther [EMAIL PROTECTED] wrote: The unique thing about the IIfx RAM is that it is on 64 pin SIMMs instead of 30 pin SIMMs. Strictly speaking, it's not unique because one (two?) of Apple's LaserWriters used the same 64 pin RAM. The IIfx RAM will work in those printers. RAM made and sold specifically fo those printers won't work in a IIfx because it's too slow. So check the speed when pilliaging LaserWriters for RAM for a IIfx. :) It will be total Fandemonium! August (Fri) 4th, (Sat) 5th (Sun) 6th, 2006 http://www.fandemonium.org Start your day with Yahoo! - make it your home page http://www.yahoo.com/r/hs -- Vintage Macs is sponsored by http://lowendmac.com/ and... Small Dog Electronicshttp://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac http://lowendmac.com/lists/support.html Vintage Macs list info: http://lowendmac.com/lists/vintagemacs.shtml -- AOL users, remove mailto:; Send list messages to: mailto:vintage.macs@mail.maclaunch.com To unsubscribe, email: mailto:[EMAIL PROTECTED] For digest mode, email: mailto:[EMAIL PROTECTED] Subscription questions: mailto:[EMAIL PROTECTED] Archive: http://www.mail-archive.com/vintage.macs%40mail.maclaunch.com/ iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com
Re: Macintosh IIfx SIMMs/Information
I'm quite certain that the MacIIci was offered in a special government configuration which used the parity option. Yes, I just checked my reference. There was a separate logic board for the IIci with parity (service part #661-0583), available at extra cost compared to the regular one (service part #661-0532). Under Macintosh IIci Specifications, there is a heading entitled Parity Support which says, Purchase of optional parity board with parity generating chip and parity RAM converts the system to a parity system. Rob I don't believe ANY Mac has ever used error detection (called parity). Some early PC's and servers did. John -- Vintage Macs is sponsored by http://lowendmac.com/ and... Small Dog Electronicshttp://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac http://lowendmac.com/lists/support.html Vintage Macs list info: http://lowendmac.com/lists/vintagemacs.shtml -- AOL users, remove mailto:; Send list messages to: mailto:vintage.macs@mail.maclaunch.com To unsubscribe, email: mailto:[EMAIL PROTECTED] For digest mode, email: mailto:[EMAIL PROTECTED] Subscription questions: mailto:[EMAIL PROTECTED] Archive: http://www.mail-archive.com/vintage.macs%40mail.maclaunch.com/ iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com
Re: Macintosh IIfx SIMMs/Information
On Aug 31, 2005, at 11:02 PM, Robert Patterson wrote: I'm quite certain that the MacIIci was offered in a special government configuration which used the parity option. Remember in the 1980's when taxpayers were horror-striken to learn that the Pentagon had paid $640 for a toilet seat and $7,000 for a coffee pot? I guess they had enough money to convince Apple to redesign a whole motherboard. I wonder how many got made? John -- Vintage Macs is sponsored by http://lowendmac.com/ and... Small Dog Electronicshttp://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac http://lowendmac.com/lists/support.html Vintage Macs list info: http://lowendmac.com/lists/vintagemacs.shtml -- AOL users, remove mailto:; Send list messages to: mailto:vintage.macs@mail.maclaunch.com To unsubscribe, email: mailto:[EMAIL PROTECTED] For digest mode, email: mailto:[EMAIL PROTECTED] Subscription questions: mailto:[EMAIL PROTECTED] Archive: http://www.mail-archive.com/vintage.macs%40mail.maclaunch.com/ iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com
Re: Macintosh IIfx SIMMs/Information
--- John Niven [EMAIL PROTECTED] wrote: Remember in the 1980's when taxpayers were horror-striken to learn that the Pentagon had paid $640 for a toilet seat and $7,000 for a coffee pot? I guess they had enough money to convince Apple to redesign a whole motherboard. I wonder how many got made? The motherboards for the IIci, parity or non-parity, are identical. The non-parity version has solder pads for the parity chip and a few other parts. I dunno if the ROM is special for the parity version. It will be total Fandemonium! August (Fri) 4th, (Sat) 5th (Sun) 6th, 2006 http://www.fandemonium.org __ Yahoo! Mail for Mobile Take Yahoo! Mail with you! Check email on your mobile phone. http://mobile.yahoo.com/learn/mail -- Vintage Macs is sponsored by http://lowendmac.com/ and... Small Dog Electronicshttp://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac http://lowendmac.com/lists/support.html Vintage Macs list info: http://lowendmac.com/lists/vintagemacs.shtml -- AOL users, remove mailto:; Send list messages to: mailto:vintage.macs@mail.maclaunch.com To unsubscribe, email: mailto:[EMAIL PROTECTED] For digest mode, email: mailto:[EMAIL PROTECTED] Subscription questions: mailto:[EMAIL PROTECTED] Archive: http://www.mail-archive.com/vintage.macs%40mail.maclaunch.com/ iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com
Re: Macintosh IIfx SIMMs/Information
From: John Niven [EMAIL PROTECTED] Subject: Re: Macintosh IIfx SIMMs/Information Date: Wed, 31 Aug 2005 14:27:17 -0700 On Aug 31, 2005, at 11:44 AM, Jeff Walther wrote: The pinout shows a separate data_in and data_out pin for each bit of the SIMM. In other words, it's an eight bit SIMM, but instead of simply having eight data pins Data[0:7] it has eight Data_In[0:7] and eight Data_Out[0:7] pins. The by one bit DRAMs had separate input and output pins. Most users just tied them together and hooked them to a bi-directional bus. I haven't looked into this, but I always assumed that what the IIfx did was keep the In and Out busses separate so that the timing operations could be overlapped thus speeding up memory operations. First, thank you, John for that insightful information. That makes a lot of sense. Second: Argghhh! I checked some X 1 DRAM chip datasheets, and shore 'nuff they have separate data in and data out pins. By 4s and by 8s do not. This does still leave open the question of whether the IIfx timing requires the separate data paths. I can probably learn a little by examining the timing dia grams for the X 1 chips to see if the output from a read is held while the RAS signal comes in for a Write. However, thinking about it now, I'm not sure that makes much sense really. The data for a write doesn't need to go on the data bus until shortly before the CAS goes active. So even without separate data paths, there's most of the RAS operation available for overlap. And this would only come into play when a write follows a read or vice versa. This is the kind of thing that would probably be answered by the IIFX Developer Notes, which I really wish I had a copy of. I suppose it is possible that the IIfx puts the data on the bus for a Write at the same time as RAS goes active. That wouldn't help performance, but it might have made the IIfx design easier. I really wish I had that developer note. Date: Wed, 31 Aug 2005 16:39:42 -0500 From: [EMAIL PROTECTED] Didn't IIfx RAM's have nine bits for error detection? I seem to remember that there was something different about them and the RAM for a IIfx was unique to that Mac. All other Macs of that vintage had interchangeable RAM. The Guide to the Macintosh Family Hardware indicates that both the IIci and the IIfx had parity options available. These were options that had to be ordered from the factory as they involved soldering down extra chips. I know that the IIci has a position on the motherboard for the parity supporting chip. I've never looked over a IIfx board to see if it has a similar provision. The unique thing about the IIfx RAM is that it is on 64 pin SIMMs instead of 30 pin SIMMs. Strictly speaking, it's not unique because one (two?) of Apple's LaserWriters used the same 64 pin RAM. Anyway, if anyone has that IIfx Apple Hardware Developer Note, I'd sure like to get a copy. Jeff -- Vintage Macs is sponsored by http://lowendmac.com/ and... Small Dog Electronicshttp://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac http://lowendmac.com/lists/support.html Vintage Macs list info: http://lowendmac.com/lists/vintagemacs.shtml -- AOL users, remove mailto:; Send list messages to: mailto:vintage.macs@mail.maclaunch.com To unsubscribe, email: mailto:[EMAIL PROTECTED] For digest mode, email: mailto:[EMAIL PROTECTED] Subscription questions: mailto:[EMAIL PROTECTED] Archive: http://www.mail-archive.com/vintage.macs%40mail.maclaunch.com/ iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com
Re: Macintosh IIfx SIMMs/Information
--- Jeff Walther [EMAIL PROTECTED] wrote: Does anyone have a pinout/datasheet for the IIfx/LWNT 64 pin SIMMs? I'm thinking about running off a few homebrew circuit boards, but haven't been able to turn up the information on the web. If you're thinking of SIMM stackers to put 4 72pin SIMMs into one IIfx slot, that's been done already. It will be total Fandemonium! August (Fri) 4th, (Sat) 5th (Sun) 6th, 2006 http://www.fandemonium.org __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com -- Vintage Macs is sponsored by http://lowendmac.com/ and... Small Dog Electronicshttp://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac http://lowendmac.com/lists/support.html Vintage Macs list info: http://lowendmac.com/lists/vintagemacs.shtml -- AOL users, remove mailto:; Send list messages to: mailto:vintage.macs@mail.maclaunch.com To unsubscribe, email: mailto:[EMAIL PROTECTED] For digest mode, email: mailto:[EMAIL PROTECTED] Subscription questions: mailto:[EMAIL PROTECTED] Archive: http://www.mail-archive.com/vintage.macs%40mail.maclaunch.com/ iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com
Re: Macintosh IIfx SIMMs/Information
- Original Message - From: Gregg Eshelman [EMAIL PROTECTED] To: Vintage Macs vintage.macs@mail.maclaunch.com Sent: Wednesday, August 31, 2005 2:57 AM Subject: Re: Macintosh IIfx SIMMs/Information --- Jeff Walther [EMAIL PROTECTED] wrote: If you're thinking of SIMM stackers to put 4 72pin SIMMs into one IIfx slot, that's been done already. Do you have a link or information on those SIMM stackers? And did you mean 4 30 pin SIMMs? -- Vintage Macs is sponsored by http://lowendmac.com/ and... Small Dog Electronicshttp://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac http://lowendmac.com/lists/support.html Vintage Macs list info: http://lowendmac.com/lists/vintagemacs.shtml -- AOL users, remove mailto:; Send list messages to: mailto:vintage.macs@mail.maclaunch.com To unsubscribe, email: mailto:[EMAIL PROTECTED] For digest mode, email: mailto:[EMAIL PROTECTED] Subscription questions: mailto:[EMAIL PROTECTED] Archive: http://www.mail-archive.com/vintage.macs%40mail.maclaunch.com/ iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com
Macintosh IIfx SIMMs/Information
At 13:30 -0500 08/31/2005, Jeff Walther wrote: Does anyone have a pinout/datasheet for the IIfx/LWNT 64 pin SIMMs? I'm thinking about running off a few homebrew circuit boards, but haven't been able to turn up the information on the web. Okay, I found the pinout in the Guide to the Macintosh Family Hardware. However, I'm still lacking the physical specifications, i.e. the size and shape. There should be an engineering drawing out there somewhere with the dimensions. And some discussion of the electronic attributes of the 64 pin SIMM would be nice too. The pinout shows a separate data_in and data_out pin for each bit of the SIMM. In other words, it's an eight bit SIMM, but instead of simply having eight data pins Data[0:7] it has eight Data_In[0:7] and eight Data_Out[0:7] pins. That could imply that the IIfx SIMM requires bizarre dual data ported chips, but the chip examples I've identified (thanks Bob) seem to be normal DRAM chips. It could also mean that the Data_In and Data_Out pins are simply tied together on the SIMM (at the chip data pin). That's the kind of thing that the electronic specifications for the 64 pin SIMM should tell me. Jeff Walther -- Vintage Macs is sponsored by http://lowendmac.com/ and... Small Dog Electronicshttp://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac http://lowendmac.com/lists/support.html Vintage Macs list info: http://lowendmac.com/lists/vintagemacs.shtml -- AOL users, remove mailto:; Send list messages to: mailto:vintage.macs@mail.maclaunch.com To unsubscribe, email: mailto:[EMAIL PROTECTED] For digest mode, email: mailto:[EMAIL PROTECTED] Subscription questions: mailto:[EMAIL PROTECTED] Archive: http://www.mail-archive.com/vintage.macs%40mail.maclaunch.com/ iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com
Re: Macintosh IIfx SIMMs/Information
On Aug 31, 2005, at 11:44 AM, Jeff Walther wrote: The pinout shows a separate data_in and data_out pin for each bit of the SIMM. In other words, it's an eight bit SIMM, but instead of simply having eight data pins Data[0:7] it has eight Data_In[0:7] and eight Data_Out[0:7] pins. The by one bit DRAMs had separate input and output pins. Most users just tied them together and hooked them to a bi-directional bus. I haven't looked into this, but I always assumed that what the IIfx did was keep the In and Out busses separate so that the timing operations could be overlapped thus speeding up memory operations. That could imply that the IIfx SIMM requires bizarre dual data ported chips, but the chip examples I've identified (thanks Bob) seem to be normal DRAM chips. I assume the mother board has the bizarre dual data ported chips so the SIMMs are unique in NOT hooking the In and Out pins together :-) John -- Vintage Macs is sponsored by http://lowendmac.com/ and... Small Dog Electronicshttp://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac http://lowendmac.com/lists/support.html Vintage Macs list info: http://lowendmac.com/lists/vintagemacs.shtml -- AOL users, remove mailto:; Send list messages to: mailto:vintage.macs@mail.maclaunch.com To unsubscribe, email: mailto:[EMAIL PROTECTED] For digest mode, email: mailto:[EMAIL PROTECTED] Subscription questions: mailto:[EMAIL PROTECTED] Archive: http://www.mail-archive.com/vintage.macs%40mail.maclaunch.com/ iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com
Re: Macintosh IIfx SIMMs/Information
on 8/31/05 4:27 PM, John Niven at [EMAIL PROTECTED] wrote: On Aug 31, 2005, at 11:44 AM, Jeff Walther wrote: The pinout shows a separate data_in and data_out pin for each bit of the SIMM. In other words, it's an eight bit SIMM, but instead of simply having eight data pins Data[0:7] it has eight Data_In[0:7] and eight Data_Out[0:7] pins. The by one bit DRAMs had separate input and output pins. Most users just tied them together and hooked them to a bi-directional bus. I haven't looked into this, but I always assumed that what the IIfx did was keep the In and Out busses separate so that the timing operations could be overlapped thus speeding up memory operations. That could imply that the IIfx SIMM requires bizarre dual data ported chips, but the chip examples I've identified (thanks Bob) seem to be normal DRAM chips. I assume the mother board has the bizarre dual data ported chips so the SIMMs are unique in NOT hooking the In and Out pins together :-) John Didn't IIfx RAM's have nine bits for error detection? I seem to remember that there was something different about them and the RAM for a IIfx was unique to that Mac. All other Macs of that vintage had interchangeable RAM. r -- Vintage Macs is sponsored by http://lowendmac.com/ and... Small Dog Electronicshttp://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac http://lowendmac.com/lists/support.html Vintage Macs list info: http://lowendmac.com/lists/vintagemacs.shtml -- AOL users, remove mailto:; Send list messages to: mailto:vintage.macs@mail.maclaunch.com To unsubscribe, email: mailto:[EMAIL PROTECTED] For digest mode, email: mailto:[EMAIL PROTECTED] Subscription questions: mailto:[EMAIL PROTECTED] Archive: http://www.mail-archive.com/vintage.macs%40mail.maclaunch.com/ iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com
Re: Macintosh IIfx SIMMs/Information
I'm almost positive that there was something like this on the IIfx in reguards to RAM. I don't know why, but the IIfx was an oddball of sorts. The black SCSI terminator, the quirky RAM. I have a dead one at my warehouse (yes, I got a smaller place and had to store all but one of my old Macs--a Classic is the only one with me) and I will make an effort to check the RAM out on it when I go in a few weeks. I might put it side by side with my other II series (I have a IIsi, a II, and an SE/30 which is like a IIx) just to see. Scott --- [EMAIL PROTECTED] wrote: on 8/31/05 4:27 PM, John Niven at [EMAIL PROTECTED] wrote: On Aug 31, 2005, at 11:44 AM, Jeff Walther wrote: The pinout shows a separate data_in and data_out pin for each bit of the SIMM. In other words, it's an eight bit SIMM, but instead of simply having eight data pins Data[0:7] it has eight Data_In[0:7] and eight Data_Out[0:7] pins. The by one bit DRAMs had separate input and output pins. Most users just tied them together and hooked them to a bi-directional bus. I haven't looked into this, but I always assumed that what the IIfx did was keep the In and Out busses separate so that the timing operations could be overlapped thus speeding up memory operations. That could imply that the IIfx SIMM requires bizarre dual data ported chips, but the chip examples I've identified (thanks Bob) seem to be normal DRAM chips. I assume the mother board has the bizarre dual data ported chips so the SIMMs are unique in NOT hooking the In and Out pins together :-) John Didn't IIfx RAM's have nine bits for error detection? I seem to remember that there was something different about them and the RAM for a IIfx was unique to that Mac. All other Macs of that vintage had interchangeable RAM. r -- Vintage Macs is sponsored by http://lowendmac.com/ and... Small Dog Electronicshttp://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac http://lowendmac.com/lists/support.html Vintage Macs list info: http://lowendmac.com/lists/vintagemacs.shtml -- AOL users, remove mailto:; Send list messages to: mailto:vintage.macs@mail.maclaunch.com To unsubscribe, email: mailto:[EMAIL PROTECTED] For digest mode, email: mailto:[EMAIL PROTECTED] Subscription questions: mailto:[EMAIL PROTECTED] Archive: http://www.mail-archive.com/vintage.macs%40mail.maclaunch.com/ iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com Start your day with Yahoo! - make it your home page http://www.yahoo.com/r/hs -- Vintage Macs is sponsored by http://lowendmac.com/ and... Small Dog Electronicshttp://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac http://lowendmac.com/lists/support.html Vintage Macs list info: http://lowendmac.com/lists/vintagemacs.shtml -- AOL users, remove mailto:; Send list messages to: mailto:vintage.macs@mail.maclaunch.com To unsubscribe, email: mailto:[EMAIL PROTECTED] For digest mode, email: mailto:[EMAIL PROTECTED] Subscription questions: mailto:[EMAIL PROTECTED] Archive: http://www.mail-archive.com/vintage.macs%40mail.maclaunch.com/ iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com
Re: Macintosh IIfx SIMMs/Information
On Aug 31, 2005, at 2:39 PM, [EMAIL PROTECTED] wrote: on 8/31/05 4:27 PM, John Niven at [EMAIL PROTECTED] wrote: On Aug 31, 2005, at 11:44 AM, Jeff Walther wrote: The pinout shows a separate data_in and data_out pin for each bit of the SIMM. In other words, it's an eight bit SIMM, but instead of simply having eight data pins Data[0:7] it has eight Data_In[0:7] and eight Data_Out[0:7] pins. The by one bit DRAMs had separate input and output pins. Most users just tied them together and hooked them to a bi-directional bus. I haven't looked into this, but I always assumed that what the IIfx did was keep the In and Out busses separate so that the timing operations could be overlapped thus speeding up memory operations. That could imply that the IIfx SIMM requires bizarre dual data ported chips, but the chip examples I've identified (thanks Bob) seem to be normal DRAM chips. I assume the mother board has the bizarre dual data ported chips so the SIMMs are unique in NOT hooking the In and Out pins together :-) John Didn't IIfx RAM's have nine bits for error detection? I seem to remember that there was something different about them and the RAM for a IIfx was unique to that Mac. All other Macs of that vintage had interchangeable RAM. r No. The RAM uses 8 DRAM chips. The unique thing that you remember is that it was packaged in a 64pin SIMM (not the then customary 30pin). It did this to allow the DRAM data inputs and outputs to be brought out separately to the edge connector of the SIMM. This also means that a IIfx SIMM could ONLY be made with by one organized DRAM's. I don't believe ANY Mac has ever used error detection (called parity). Some early PC's and servers did. John -- Vintage Macs is sponsored by http://lowendmac.com/ and... Small Dog Electronicshttp://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac http://lowendmac.com/lists/support.html Vintage Macs list info: http://lowendmac.com/lists/vintagemacs.shtml -- AOL users, remove mailto:; Send list messages to: mailto:vintage.macs@mail.maclaunch.com To unsubscribe, email: mailto:[EMAIL PROTECTED] For digest mode, email: mailto:[EMAIL PROTECTED] Subscription questions: mailto:[EMAIL PROTECTED] Archive: http://www.mail-archive.com/vintage.macs%40mail.maclaunch.com/ iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com
Re: Macintosh IIfx SIMMs/Information
Date: Tue, 30 Aug 2005 23:57:33 -0700 (PDT) From: Gregg Eshelman [EMAIL PROTECTED] --- Jeff Walther [EMAIL PROTECTED] wrote: Does anyone have a pinout/datasheet for the IIfx/LWNT 64 pin SIMMs? I'm thinking about running off a few homebrew circuit boards, but haven't been able to turn up the information on the web. If you're thinking of SIMM stackers to put 4 72pin SIMMs into one IIfx slot, that's been done already. No, I'm thinking of making actual 64 pin SIMMs. However, as an aside, I do not see how the above could possibly work. 72 pin SIMMs are 32 bits wide. 64 pin SIMMs are only 8 bits wide. One might make an adapter, but at best it would convert one 72 pin SIMM into a 64 pin SIMM with 1/4 the capacity of the 72 pin SIMM. It works to convert four 30 pin SIMMs (8 bits wide each) into one 72 pin SIMM (32 bits wide total 4 X 8 = 32).It does not work to try that in the other direction. I suppose one could build a monstrosity to plug into four 64 pin sockets simultaneously and route to one 72 pin SIMM, but even that would have problems because of the ways that the 72 pin SIMMs play with addressing and the Chip Enable signals. Plus, I think that by the time you could build such a thing, it'd be easier to just desolder the chips from the 72 pin SIMM and put them on four 64 pin SIMM boards. You've got to build boards that plug into the 64 pin sockets in either case. Jeff Walther -- Vintage Macs is sponsored by http://lowendmac.com/ and... Small Dog Electronicshttp://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac http://lowendmac.com/lists/support.html Vintage Macs list info: http://lowendmac.com/lists/vintagemacs.shtml -- AOL users, remove mailto:; Send list messages to: mailto:vintage.macs@mail.maclaunch.com To unsubscribe, email: mailto:[EMAIL PROTECTED] For digest mode, email: mailto:[EMAIL PROTECTED] Subscription questions: mailto:[EMAIL PROTECTED] Archive: http://www.mail-archive.com/vintage.macs%40mail.maclaunch.com/ iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com
Re: Macintosh IIfx SIMMs/Information
--- Powermac [EMAIL PROTECTED] wrote: Do you have a link or information on those SIMM stackers? And did you mean 4 30 pin SIMMs? www.micromac.com used to sell them. Pop their URL into the Wayback Machine at www.archive.org and you should be able to dig up something on them. If Micro Mac's prices cause your mouth to drop open, they've always been way overpriced. It will be total Fandemonium! August (Fri) 4th, (Sat) 5th (Sun) 6th, 2006 http://www.fandemonium.org __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com -- Vintage Macs is sponsored by http://lowendmac.com/ and... Small Dog Electronicshttp://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac http://lowendmac.com/lists/support.html Vintage Macs list info: http://lowendmac.com/lists/vintagemacs.shtml -- AOL users, remove mailto:; Send list messages to: mailto:vintage.macs@mail.maclaunch.com To unsubscribe, email: mailto:[EMAIL PROTECTED] For digest mode, email: mailto:[EMAIL PROTECTED] Subscription questions: mailto:[EMAIL PROTECTED] Archive: http://www.mail-archive.com/vintage.macs%40mail.maclaunch.com/ iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com
Macintosh IIfx SIMMs/Information
Does anyone have a pinout/datasheet for the IIfx/LWNT 64 pin SIMMs? I'm thinking about running off a few homebrew circuit boards, but haven't been able to turn up the information on the web. There is one mention in an Apple Technical Note that you can get the specs by contacting Apple Developer C--just send a postcard with the code word...a little out of date, although it might be interesting to try it. For that matter, I would love to see a copy of the Hardware Developer Notes for the IIfx. There are HDNs for the IIci, IIsi and LC on Apple's site still, but no HDNs for the IIfx. BTW, it looks like the set of IIfx SIMMs on Ebay which were recently mentioned, may contain a set of 4 MB SIMMs instead of 16 MB SIMMs. The seller very kindly read the chip numbers off to me and eight M5M44100BJ chips would appear to make a 4 MB SIMM. That's assuming that the source which says the M5M44100BJ is a 4M X 1 chip is correct. Jeff Walther -- Vintage Macs is sponsored by http://lowendmac.com/ and... Small Dog Electronicshttp://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac http://lowendmac.com/lists/support.html Vintage Macs list info: http://lowendmac.com/lists/vintagemacs.shtml -- AOL users, remove mailto:; Send list messages to: mailto:vintage.macs@mail.maclaunch.com To unsubscribe, email: mailto:[EMAIL PROTECTED] For digest mode, email: mailto:[EMAIL PROTECTED] Subscription questions: mailto:[EMAIL PROTECTED] Archive: http://www.mail-archive.com/vintage.macs%40mail.maclaunch.com/ iPod Accessories for Less at 1-800-iPOD.COM Fast Delivery, Low Price, Good Deal www.1800ipod.com
