| 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 switchingOUT:
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)
Fc = 0Registers changed after return:
..BCDEHL/IXIY sameThe OS_Fc fast bank switching code has now been established. Subsequent calls to OS_Fc with:
AF....../.... different
IN: A = bank to bind to segment specified by OS_Fc initializationOUT:
AFBCDEHL/IXIY/afbcdehl sameNotes:
......../..../........ different
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
OZ_Mgb, get current bank binding in segment
OZ_Mpb, set new bank binding in segment