PET VIC-20 C64 C16 Plus/4 C128 X16 M65
MEMSET <source_address>, <length>, <fill_value>
The MEMSET command calls a built-in routine that sets length number of bytes in memory to fill_value starting from source_address.
REM -- clear the screen MEMSET 1024, 1000, 32
Note
MEMSET uses fast Direct Memory Access (DMA) on the M65.