Z88 Developers' Notes
Contents   Contents of System Calls

OS_Fc, select fast code (fast bank switching)

RST 20H, DEFB $8A

IN: 

     A = 1, for fast bank switching
     DE = address to copy code into
     HL = 0, for code to terminate with RET
     HL <> 0, for code to terminate with JP (HL)
     C = segment for bank switching (MS_Sx)
OUT: 
     Fc = 0
Registers changed after return: 
     ..BCDEHL/IXIY same
     AF....../.... different
The OS_Fc fast bank switching code has now been established. Subsequent calls to OS_Fc with:
  
IN:  A = bank to bind to segment specified by OS_Fc initialization
OUT: 
     AFBCDEHL/IXIY/afbcdehl same
     ......../..../........ different
Notes:
OS_Fc has only been implemented with the above bank switching routine.

Bugs:
 

Related calls:

OS_Bix, Bind in extended address
OS_Box, restore bindings after OS_Bix
OS_Mal, allocate memory
OS_Mcl, close memory (free memory pool)
OS_Mfr, free (previously allocated block) memory
OS_Mgb, get current bank binding in segment
OS_Mop, open memory (allocate memory pool)
OS_Mpb, set new bank binding in segment