millfork/examples/apple2/diskrom_dump.mfk

// simple demonstration of ProDOS library routines that will write
// the Disk II ROM (assuming it is in slot 6) to the file DISKII.ROM

import stdio
import apple2_prodos

void main() {
    // ProDOS requires a 1K aligned page for an open file as an IO buffer
    array iobuf [1024] align(256)  

    // you have to explicitly create a file if it doesn't exist yet
    // this can fail (so you should check prodos_error
    // 06 is general binary type  
    prodos_create("DISKII.ROM"p, $06)
    if prodos_error != 0 {
        // prodos error call will be returned in prodos_error so you know
        // what went wrong. 0 = no error
        putstrz("{n}couldn't create file"z)
        panic()
    }

    // ProDOS file handle
    byte fp

    fp = prodos_open("DISKII.ROM"p, iobuf)
    // should check here again for error, and after all calls

    // write the disk controller ROM to the file
    prodos_write(fp, $c600, 256)

    // closing frees the handle and io buffer
    prodos_close(fp)

    putstrz("{n}DONE"z)

    while true { } 
}