unsigned char int15_copy (long from, long to, long len) 

The int15_copy() function is intended for an x86 system with a BIOS running in real mode. The function lets you copy data from high memory (above 1 MB) to a buffer or to low memory (below 1 MB).

The int15_copy() function also allows functions such as image_scan() and image_setup() to perform scanning and setup of images living in high memory.