1986_Sharp_MOS_Semiconductor_Data_Book has a very brief datasheet, no information on memory layout. There's also documentation (in Russian) of the Soviet SM5A clone KB1013VK1-2. Igor ( https://forums.bannister.org/ubbthreads.php?ubb=showprofile&User=8047 ) knows how to electronically dump that one, real SM5A is probably going to be very similar to dump.