prog8/compiler/res/prog8lib/cx16/cx16diskio.p8

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; 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.
2022-01-03 21:44:27 +00:00
; 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.
; The load address is mandatory. Returns the number of bytes loaded.
; If you load into regular system ram, use cx16.getrambank() for the bank argument,
; or alternatively make sure to reset the correct ram bank yourself after the load!
; 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_headerless_cx16(drivenumber, filenameptr, address, true)
}
; 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
}
asmsub vload(str name @R0, ubyte device @Y, ubyte bank @A, uword address @R1) -> ubyte @A {
; -- like the basic command VLOAD "filename",device,bank,address
; loads a file into Vera's video memory in the given bank:address, returns success in A
%asm {{
; -- load a file into video ram
phx
pha
tya
tax
lda #1
ldy #0
jsr c64.SETLFS
lda cx16.r0
ldy cx16.r0+1
jsr prog8_lib.strlen
tya
ldx cx16.r0
ldy cx16.r0+1
jsr c64.SETNAM
pla
clc
adc #2
ldx cx16.r1
ldy cx16.r1+1
stz P8ZP_SCRATCH_B1
jsr c64.LOAD
bcs +
inc P8ZP_SCRATCH_B1
+ jsr c64.CLRCHN
lda #1
jsr c64.CLOSE
plx
lda P8ZP_SCRATCH_B1
rts
}}
}
}