Format: memwrite size addr value
Performs a sized memory write to the target. This command is intended to be used to perform low-level writes to regions of memory or memory-mapped I/O registers. This command does not make use of MULTI's memory cache and the write is performed immediately. See _CACHE.
size must be 1, 2, or 4. The units are bytes. addr must be aligned correctly to the nearest size bytes. Both addr and value may consist of any expression that MULTI can evaluate. If value is larger than can fit in size bytes, it will be truncated to fit.