C = number of bytes to copy (0 to 255)
BHL = extended source pointer (B = 0, local pointer)
DE = local destination pointer ($0000-$7FFF)
Fc = 0 always
Registers changed after return:
- Bank boundary crossing of source is automatically handled, if number of bytes to read passes between to banks then B is incremented (typically when reading contents from a File Entry on a File Card).
- The DE destination pointer has to be in segment 0 or 1.
- The call does not work if the destination pointer defines memory in segments 2 or 3.
GN_Cme, compare null-terminated strings, one local, one extended
GN_Rbe, read byte at extended address
GN_Wbe, write byte at extended address
OS_Bde, copy bytes to extended address