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890327b381
This fixes the inconsistent attempt to calculate a size, just let the caller do this if required. Added a small helper function in cx16diskio to do this for loads that span multiple banks.
38 lines
1.9 KiB
Lua
38 lines
1.9 KiB
Lua
; Cx16 specific disk drive I/O routines.
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;
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; Written by Irmen de Jong (irmen@razorvine.net) - license: GNU GPL 3.0
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%import diskio
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cx16diskio {
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; Use kernal LOAD routine to load the given program file in memory.
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; This mimimics Basic's LOAD "filename",drive / LOAD "filename",drive,1
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; If you don't give an address_override, the location in memory is taken from the 2-byte file header.
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; If you specify a custom address_override, the first 2 bytes in the file are ignored
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; and the rest is loaded at the given location in memory.
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; Returns the end load address+1 if successful or 0 if a load error occurred.
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; You can use the load_size() function to calcuate the size of the file that was loaded.
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sub load(ubyte drivenumber, uword filenameptr, ubyte bank, uword address_override) -> uword {
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cx16.rambank(bank)
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return diskio.load(drivenumber, filenameptr, address_override)
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}
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; Use kernal LOAD routine to load the given file in memory.
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; INCLUDING the first 2 bytes in the file: no program header is assumed in the file.
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; This is different from Basic's LOAD instruction which always skips the first two bytes.
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; The load address is mandatory. Returns the number of bytes loaded.
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; Returns the end load address+1 if successful or 0 if a load error occurred.
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; You can use the load_size() function to calcuate the size of the file that was loaded.
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sub load_raw(ubyte drivenumber, uword filenameptr, ubyte bank, uword address) -> uword {
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cx16.rambank(bank)
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return diskio.load_raw(drivenumber, filenameptr, address)
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}
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; For use directly after a load or load_raw call (don't mess with the ram bank yet):
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; Calculates the number of bytes loaded (files > 64Kb ar truncated to 16 bits)
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sub load_size(ubyte startbank, uword startaddress, uword endaddress) -> uword {
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return $2000 * (cx16.getrambank() - startbank) + endaddress - startaddress
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}
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}
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