Marpet Xtra-RAM Instructions and Pictures

[1024MAK]

Attached is a scanned copy of the Marpet Xtra-RAM Instructions

Marpet Xtra-RAM Instructions.zip

Marpet and similar DRAM upgrades - some pictures

Marpet DRAM upgrade - SIMM DRAM board.jpg

Marpet DRAM upgrade - Go Direct Ltd 4MB DRAM board.jpg

Marpet DRAM upgrade - MMU adapter.jpg

Marpet DRAM upgrade - MMU adapter (U56 with piggy back connector).jpg

Marpet DRAM upgrade - Shifter adapter.jpg

Marpet DRAM upgrade - Shifter adapter close up.jpg

[1024MAK]

And the resister connections:

Marpet DRAM upgrade +5V connections.jpg

Marpet DRAM upgrade +5V connections to resistors.jpg

[simbo]

always thought it was a horrible addin
and no real fun
uses too many ic's and come loose causing shipping issues....
advice is to add some poly foam above the mmu etc to stop it bouncing off
if your going to do a ram add in make it as perminant as the original ram
with the least issues

[wongck]

Horrible or not.... may it can be better done I guess.

yes, I agree that the adapter for MMU escpecially the one on mine being a SMD type will come/bounce off.
Had some scary times, when it seems not to work but a good press on the adapter fixes it.
( bad for the leads, I am sure).
Friend of mine helped me by putting dollops hot glue to hold it.

[1024MAK]

yes, I agree that the adapter for MMU escpecially the one on mine being a SMD type will come/bounce off.
Had some scary times, when it seems not to work but a good press on the adapter fixes it.
( bad for the leads, I am sure).
Friend of mine helped me by putting dollops hot glue to hold it.

Just like the one in the picture above (this was already fitted like this on a machine that I obtained)...
Have never had a problem with it
I guess that it was so popular, as some versions for Atari's with a socketed shifter were easy to fit (no soldering needed).

[wongck]

Yeap. I can see hot glue at the side to hold it down.
Before it was hot glued down, I had to press it down for it to work.
But the solderless upgrade was a great thing!!

[Atarist8te74]

I have just obtained an Marpet MP210A 4mb ram expansion. It is populated with sips not simms. It is in a rougth state, the mmu & shifter adaptor ribbons are slightly damaged. The pins on the mmu adaptor need straightening and the video shifter adaptor has a pin missing? The missing pin faces towards the back when it is fitted into the motherboard and is the very last pin underneath, row closest to the back of the board/case... if you get me?

I might crack open the digi camera and get some pictures.

[exxos]

I have brought a STFM this week which has one of those marpet 4MB things fitted, its using 4 32pin simms, the "resistor mods" differ to the images shown too. Bit of a arse since I need to remove the kit and will have to replace the MMU socket no doubt