Turbo-R ST 4MB Internal Memory Upgrade

Even if I know that some Dutchies have this upgrade inside their turboRs (at least for GTs) I would not recommend it. Some software won't work because they don't have an accurate memory search, so be careful with it. If you still need this mod just add a switch to select it (2/4mb).

The upgrade to 512KB is very easy so I would go for it if I were you. Of course, I already have this mod in my ST.

Anyway maybe you could find something in MSX Info Pages (512KB and 1MB) MemoryAndMappers

Please don't say that. 4MB works just fine. I have it for years and you don't need a switch. The only problem I had was unkown reality,but that was easily fixed. You probably never owned 4MB SaebaMSX and probably never even seen software fail on this.

I was wondering ...how do you use your 4mb ??

meaning what software uses the whole 4mb ?

Dos2.0 can use it all

My FS A1ST has a internal 1024Kb of RAM (using a 30 pin memory module) and a switch key to change between 1Mb and 256Kb just for programs that reads mapper registers. And I think that a internal 4Mb isn't possible because a limitation of S-1990 IC.

My Turbo-R already is upgraded to 512k internal, I wanted to do the 4MB upgrade because I read that 4MB is the largest amount that DOS2 can address. MSD, do you have the info on how to do it for an ST? Thanks alot!