prog8/compiler/res/prog8lib/cx16/cx16diskio.p8
2022-01-03 23:15:34 +01:00

38 lines
1.9 KiB
Lua

; Cx16 specific disk drive I/O routines.
;
; Written by Irmen de Jong (irmen@razorvine.net) - license: GNU GPL 3.0
%import diskio
cx16diskio {
; Use kernal LOAD routine to load the given program file in memory.
; This is similar to Basic's LOAD "filename",drive / LOAD "filename",drive,1
; If you don't give an address_override, the location in memory is taken from the 2-byte file header.
; If you specify a custom address_override, the first 2 bytes in the file are ignored
; and the rest is loaded at the given location in memory.
; Returns the end load address+1 if successful or 0 if a load error occurred.
; You can use the load_size() function to calcuate the size of the file that was loaded.
sub load(ubyte drivenumber, uword filenameptr, ubyte bank, uword address_override) -> uword {
cx16.rambank(bank)
return diskio.load(drivenumber, filenameptr, address_override)
}
; Use kernal LOAD routine to load the given file in memory.
; INCLUDING the first 2 bytes in the file: no program header is assumed in the file.
; This is different from Basic's LOAD instruction which always skips the first two bytes.
; The load address is mandatory. Returns the number of bytes loaded.
; Returns the end load address+1 if successful or 0 if a load error occurred.
; You can use the load_size() function to calcuate the size of the file that was loaded.
sub load_raw(ubyte drivenumber, uword filenameptr, ubyte bank, uword address) -> uword {
cx16.rambank(bank)
return diskio.load_raw(drivenumber, filenameptr, address)
}
; For use directly after a load or load_raw call (don't mess with the ram bank yet):
; Calculates the number of bytes loaded (files > 64Kb ar truncated to 16 bits)
sub load_size(ubyte startbank, uword startaddress, uword endaddress) -> uword {
return $2000 * (cx16.getrambank() - startbank) + endaddress - startaddress
}
}