The author recommends Androda’s new 7MB Macintosh Portable RAM card and notes that it is compatible with both backlit and non-backlit systems. They also highlight the difficulty of finding RAM cards for the Portable and the fact that the older MacEffects 8MB upgrade is no longer being made due to a lack of chip supply. The article includes pictures and information about the author’s DVT prototype O.G. Macintosh Portable, including a beta version of System 6.0.6b12 and an Aldus Persuasion 1.0 presentation about the forthcoming System 7. The author encourages readers to support vintage Mac homebrew and buy the RAM card at a great price.
http://oldvcr.blogspot.com/2023/06/new-ram-card-prototype-mac-portable.html