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I've been interested in making one for quite a while, I have a pair of 4MB DIMM but they have chips on both sides which is not ideal for assembly. That white module would be more ideal, I did not had the energy to route one from scratch which is why it has not been done yet. I also lacked a test...
At least, for my products, federate a group order to share shipping could be a solution. I am not happy to have to charge that much for shipping, this is my cheapest option actual cost :(
I make the MacBatt, but shipping to the US is a bit problematic at the moment.
https://www.tindie.com/products/jurassicomp/macbatt-internal-cr2032-pram-macintosh-battery/
I have placed 16MB in my SuperMac Thunder/24 and can confirm that only 8MB are seen, so 8MB seems to be the maximum amount of GWORLD RAM supported.
I have a RasterOps as well, I need to find the drivers and test it, there's some damaged pins on a QFP so it may need a little bit of repair before...
Hey everyone, sorry for letting things up in the air for a while.
I actually now have a working 4MB design, my original PCB had an issue with A9 which was not impacting the 1MB SIMM.
My supplier ran out of 1Mx4 RAM chips. I have been looking for options but I hope I can have a batch made by...
I had very limited supplies of 16MB SIMMs so I have only sold a couple kits to friends and people asking directly, but I have never listed them. I am planning on having a steady supply hopefully around June.
@mousehouse yes, modern PCB makers only offer 1.20mm instead of the 1.27mm standard for...
You do not need to replace the L2 cache. The 7400/7410 is a drop in replacement to the 750.
The ZIF module is a standard IBM/Motorola product that is documented here: https://datasheets.su/DS/NXP/MPCPCMEC.pdf
A company did a 750L to 750GX interposer, it probably is not doable in less than 8 or even 10 layers considering how little room there is. My adapter is a clone of the powerlogix one, and it cannot be done with less than 8 layers. The thread is here...
I guess it depends, I have inquired the possibility before and it was not doable in the US. I have seen hotel policies that state that you cannot get postal deliveries. I suppose they don't want any responsibility for late/missed deliveries, or to become a package storage facility. I should not...
Very cool!
Well I have reversed the pinout of my 1MB SIMM and found that A9 is indeed connected, so this led me think that 4MB modules should be possible. I have made one, but I also messed up the connection of A9 in my routing. This does not matter for the 1MB module, but it's resulting in the...
GWORLD RAM was used in other cards, I have these two.
I have made an adapter to put GWORLD RAM in my SIMMCHECK, but the 4MB SIMM is seen as a 1MB, so I have to check my design or what could cause the extra address line from being used. I think Apple created proprietary RAM at a time where 30-pin...
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