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76 lines
2.9 KiB
Lua
76 lines
2.9 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 is similar to 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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asmsub vload(str name @R0, ubyte device @Y, ubyte bank @A, uword address @R1) -> ubyte @A {
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; -- like the basic command VLOAD "filename",device,bank,address
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; loads a file into Vera's video memory in the given bank:address, returns success in A
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%asm {{
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; -- load a file into video ram
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phx
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pha
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tya
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tax
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lda #1
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ldy #0
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jsr c64.SETLFS
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lda cx16.r0
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ldy cx16.r0+1
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jsr prog8_lib.strlen
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tya
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ldx cx16.r0
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ldy cx16.r0+1
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jsr c64.SETNAM
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pla
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clc
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adc #2
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ldx cx16.r1
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ldy cx16.r1+1
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stz P8ZP_SCRATCH_B1
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jsr c64.LOAD
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bcs +
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inc P8ZP_SCRATCH_B1
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+ jsr c64.CLRCHN
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lda #1
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jsr c64.CLOSE
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plx
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lda P8ZP_SCRATCH_B1
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rts
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}}
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}
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}
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