C = number of bytes to copy (0 ... 255)
HL = local source pointer ($0000-$7FFF)
BDE = extended destination pointer
Fc = 0 always
Registers changed after return:
- Bank boundary crossing of destination is automatically handled, if number of bytes to read passes between to banks then B is incremented (typically when writing contents from a File Entry on a File Card).
- The HL source pointer has to be in segment 0 or 1.
- The call does not work if the source 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_Bhl, copy bytes from extended address