From a7220a5647adc1a59d172df7391314a9c58e61d5 Mon Sep 17 00:00:00 2001
From: Michael Pavone <pavone@retrodev.com>
Date: Sun, 1 Nov 2015 20:44:12 -0800
Subject: Fix mapping of key on/off reg bits to operators

---
 ym2612.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

(limited to 'ym2612.c')

diff --git a/ym2612.c b/ym2612.c
index 864081c..7fb5b91 100644
--- a/ym2612.c
+++ b/ym2612.c
@@ -691,8 +691,9 @@ void ym_data_write(ym2612_context * context, uint8_t value)
 				if (channel > 2) {
 					channel--;
 				}
-				for (uint8_t op = channel * 4, bit = 0x10; op < (channel + 1) * 4; op++, bit <<= 1) {
-					if (value & bit) {
+				uint8_t bits[] = {0x10, 0x40, 0x20, 0x80};
+				for (uint8_t op = channel * 4, bit = 0; op < (channel + 1) * 4; op++, bit++) {
+					if (value & bits[bit]) {
 						if (context->operators[op].env_phase == PHASE_RELEASE)
 						{
 							first_key_on = 1;
-- 
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