IM 2

[boriel]

I do: the ISR saves all the register pairs. Check the code and see

But that's not the problem. The problem occurs with bank switching. Just with bank switching, even if I don't enable my ISR or even don't enable IM2, any bank switching messes subsequent PRINT calls. Minimal case scenario:

Code:

' Test

Asm

    ; Permorm some dummy paging
    
    di
    ld  a, 5
    ld  bc, $7ffd
    out (c), a
    
    ; now RAM 5 is in.
    
    xor a
    ld  bc, $7ffd
    out (c), a  
    ld  ($5b5c), a
    ei
    
    ; back to normal
    
End Asm

Print "HOLA";

Compile and run this in either 128 BASIC or USR 0 mode. You won't see "HOLA" on screen, but a bunch of trash.

After thinking it twice I've just realized print uses ROM Font, as pointed in PEEK(Uinteger, 23606) + 256. This default value should be 15360 + 256, which is the default FONT Charset which lays in ROM. Put this font in another location and update this variable accordingly, and the print routine will work OK ;-)