filled-in some gaps in MONITOR code

src/mon_m65/imports.s

@@ -25,6 +25,7 @@
 ;; #ALIAS# m65_shadow_BZP              = KERNAL_0.m65_shadow_BZP
 
 ;; #ALIAS# wedge_dos_monitor           = BASIC_0.wedge_dos_monitor
+;; #ALIAS# do_mon_kernal_error         = BASIC_0.proxy_B1_do_mon_kernal_error
 
 
 ; 'Print immediate', original implementation by Mike Barry, adapted to 65CE02, modified to preserve .Y

src/mon_m65/mon_command_load_save.s

@@ -136,7 +136,9 @@ Mon_Save:
 Mon_Load_Save_Common:
 
    jsr  m65_shadow_BZP
+   bcc  @end
+   jsr  do_mon_kernal_error
 
-	; XXX to be finished - check for errors
+@end:
 
 	jmp Main