Programming:Saving a file
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;; This example shows the firmware functions used to save ;; a file. ;; ;; in this example, the file is called SCREEN.SCR ;; and is a dump of the screen (from the default location &c000-&ffff) ;; firmware function to open a file for writing .cas_out_open equ &bc8c ;; firmware function to write an entire file ;; the file will be written with a AMSDOS header .cas_out_direct equ &bc98 ;; firmware function to close a file opened for writing .cas_out_close equ &bc8f org &4000 call save_file ret .save_file ;; B = length of the filename in characters ld b,end_filename-filename ;; HL = address of the start of the filename ld hl,filename ;; DE = address of a 2k buffer ;; ;; in disc mode: this buffer is not used when CAS IN DIRECT ;; firmware function is used, so it is safe to put it anywhere ;; you want. ld de,0 ;; firmware function to open a file for reading call cas_out_open ;; firmware function to write the entire file ;; this will automatically generate a AMSDOS header ;; and write it before the the file data. ;; HL = load address ld hl,&c000 ;; DE = length ld de,&4000 ;; BC = execution address ld bc,&0000 ;; A = file type (2 = binary) ld a,2 ;; write file call cas_out_direct ;; firmware function to close a file opened for writing call cas_out_close ret ;; the filename to save ;; disc filenames are a maximum of 12 characters long ;; 8 characters for name, and 3 characters for extension .filename defb "SCREEN.SCR" .end_filename