128MB 72-pin SIMMs!

[Kai Robinson]

Thanks to @phipli for these!

I have an PowerPC upgraded LC475 with one of these SIMMs names on...

640MB ought to be enough for anyone... Right?

 

[alxlab]

Yeah got some of those too

Bonus fact:

You can make 16MB 30-pin SIMMs with those using 2 chips from those and using Gerret's Workshop 30-pin SIMM design which is on github. Much cheaper than buying 16MB 30-pin SIMMs on Ebay.

 

[trag]

If you can find one of the old SIMM Doublers for 72 pin SIMMs, you can stick two of them in the Q605/LC475. Of course, you won't be able to close the lid...

I actually tested that with the HP D4893 128MB SIMMs. I don't know if it will work with the Memory Master's. Some of them seem to wire the /RAS and /CAS up differently from each other.

I would be interested to know whether those will work in the PM6100. The D4893A don't work in the 6100 because the way Apple paired the four RAS lines in the SIMM sockets doesn't work with the way the /RAS and /CAS lines are associated on the D4893A.

I'm guessing these are what you got:

https://www.ebay.com/itm/151421400795

These are the ones I used with the SIMM Doubler. Now if I just knew the brand of the SIMM Doubler....

https://www.ebay.com/itm/151555126294

 

[alxlab]

The sticks Kai got are these which are FPM:

https://www.ebay.com/itm/161432070081

Wonder if a right angle adapter for the ram double could be made that would fit.

 

[Kai Robinson]

If you can find one of the old SIMM Doublers for 72 pin SIMMs, you can stick two of them in the Q605/LC475. Of course, you won't be able to close the lid...

I actually tested that with the HP D4893 128MB SIMMs. I don't know if it will work with the Memory Master's. Some of them seem to wire the /RAS and /CAS up differently from each other.

I would be interested to know whether those will work in the PM6100. The D4893A don't work in the 6100 because the way Apple paired the four RAS lines in the SIMM sockets doesn't work with the way the /RAS and /CAS lines are associated on the D4893A.

I'm guessing these are what you got:

https://www.ebay.com/itm/151421400795

These are the ones I used with the SIMM Doubler. Now if I just knew the brand of the SIMM Doubler....

https://www.ebay.com/itm/151555126294

I have some of these already

 

[trag]

The sticks Kai got are these which are FPM:

https://www.ebay.com/itm/161432070081

Wow. Great price on those. I'm not surprised they're all gone.

 

[alxlab]

Here's another source for cheap 128MB FPM sticks:

https://www.ebay.com/itm/304179340349

I know someone that had problem with solder bridges on the sticks he got though.