@node dosmemputb, memory
@subheading Syntax

@example
#include <sys/movedata.h>

void _dosmemputb(const void *buffer, size_t xfers, unsigned long offset);
@end example

@subheading Description

This function transfers data from the program's virtual address space
to MS-DOS's conventional memory space, using only byte (8-bit)
transfers.  The @var{offset} is a physical address, which can be
computed from a real-mode segment/offset pair as follows:

@example
offset = segment * 16 + offset;
@end example

The @var{xfers} is the number of bytes to transfer, and @var{buffer}
is a pointer to somewhere in your virtual address space (such as
memory obtained from @code{malloc}) where the data will come from.

@subheading Return Value

None.

@subheading Portability

@portability !ansi, !posix

@subheading Example

@example
unsigned short save_screen[25][80];
_dosmemputb(save_screen, 0xb8000, 80*2*25);
@end example