X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=ROM2%2Fchime.c;h=37ec78a58d6572d1779be18bd0927d1e983055fa;hb=24f4e50d8f5671b40d2662bbcd50e3859bcd5205;hp=e959c1a38aded560dfffb39f69297cb55952f8d6;hpb=aa57581662d5b03db65a11ecaccfaa3df24a83b0;p=uccvend-snackrom.git

diff --git a/ROM2/chime.c b/ROM2/chime.c
index e959c1a..37ec78a 100644
--- a/ROM2/chime.c
+++ b/ROM2/chime.c
@@ -1,7 +1,8 @@
 #include "vend.h"
 #include "chime.h"
 
-u8 chime_count;
+volatile u8 chime_count;
+volatile u8 unchime_count; /* silence counter */
 
 void chime() {
 	/* called from the RTI interrupt, sees if we need to turn the chime on or
@@ -9,8 +10,9 @@ void chime() {
 	 */
 	if (chime_count) {
 		chime_on();
-		--chime_count;
+		--chime_count; /* interrupts masked here, so this won't result in badness */
 	} else
 		chime_off();
+	if (unchime_count) --unchime_count;
 }