fixed some 65CE02 instabilities

c64/kernal/screen/chrout_screen_jumptable_codes.s

@@ -91,6 +91,8 @@ chrout_screen_jumptable_hi:
 
 #else
 
+.if (mod(*, $2) == 1) { nop }          // align code so that vector never crosses page boundary
+
 chrout_screen_jumptable:
 
 	.word chrout_screen_CLR
@@ -116,6 +118,8 @@ chrout_screen_jumptable:
 	.word chrout_screen_DEL
 	.word chrout_screen_RETURN
 
+.if (mod(*, $2) == 0) { nop }          // make sure routine size is always the same, needed by build system
+
 #endif