How to set screen ram?

[Overflow]

3 screens, hardware switch, 1 per 50hz, fits in 64k. (...)
Who needs 128K?

Well, I have needed 128Kb.    At first thought. 
As a restitution(?) I have used my own binary for a small fx in Basic.
RUN"FX on attached dsk (off-topic? not really: still 4 screens to switch)

[arnoldemu]

Well, I have needed 128Kb.    At first thought. 
As a restitution(?) I have used my own binary for a small fx in Basic.
RUN"FX on attached dsk (off-topic? not really: still 4 screens to switch)

I am sure you could do that so it runs in 64k, and the exe is no more than 4k
there are extra bytes in each screen to be used