diff --git a/server.c b/server.c
index c4792af..03e104e 100644
--- a/server.c
+++ b/server.c
@@ -223,6 +223,22 @@ int handle_command(RdbResponse *res, CommandBuf *cmd, VB *sim, bool *running) {
         }
         return rdb_response_send_packet(res);
     }
+    if (cmd_match_str(cmd, "M")) {
+        /* write memory */
+        uint32_t i, address, len;
+        if (!cmd_match_hex_number(cmd, &address)) return -1;
+        if (!cmd_match_str(cmd, ",")) return -1;
+        if (!cmd_match_hex_number(cmd, &len)) return -1;
+        if (!cmd_match_str(cmd, ":")) return -1;
+
+        for (i = 0; i < len; ++i) {
+            uint8_t byte;
+            if (!cmd_match_hex_bytes(cmd, 1, &byte)) return -1;
+            vbWrite(sim, address + i, VB_U8, byte);
+        }
+        rdb_response_write_str(res, "OK");
+        return rdb_response_send_packet(res);
+    }
     fprintf(stderr, "Unrecognized command.\n");
     return rdb_response_send_packet(res);
 }