Rare vintage 3rd party memory stacker used in early 80’s era Macintosh computers to include Mac Plus and Mac SE. It may work in others.

Comes with the stacker assy and well as 4 x 256 Kb 30 pin SIMM modules

These are pretty robust but is Untested. It may or may not work.

Great for any collector of unusual Macintosh/Apple compatible accessories. Free shipping to lower 48 states.

Description from the manufacturer in MacUser Magazine:

MaxPlus" from MacMemory Inc. $399

Now you can carry thepower of your MacintoshPlus even further with Max-Plus from Mac Memory Inc.

Expand to 2 megabytes today without modifying your Mac.

And tomorrow you're still free to expand to theMac Plus' full 4-megabyte potential. MaxPlus lets you run huge spreadsheets, data-bases, and memory-hungry programs like [...] room to spare for RAM disks and disk cache utilities. And you can use all your current Mac Plus software and external peripherals without modification."