From 15de5e98c4de1de469e98e68025b78510927f73d Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Mon, 2 Aug 2021 20:17:37 -0400
Subject: [PATCH] Adds [partial] test for whether counters are linked.

---
 Components/6526/Implementation/6526Implementation.hpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Components/6526/Implementation/6526Implementation.hpp b/Components/6526/Implementation/6526Implementation.hpp
index 9ea28f518..f52f01e34 100644
--- a/Components/6526/Implementation/6526Implementation.hpp
+++ b/Components/6526/Implementation/6526Implementation.hpp
@@ -249,7 +249,9 @@ void MOS6526<BusHandlerT, personality>::run_for(const HalfCycles half_cycles) {
 
 		// TODO: use CNT potentially to clock timer A, elimiante conditional above.
 		const bool timer1_did_reload = counter_[0].advance(false);
-		const bool timer2_did_reload = counter_[1].advance(timer1_did_reload);
+
+		const bool timer1_carry = timer1_did_reload && (counter_[1].control & 0x60) == 0x40;
+		const bool timer2_did_reload = counter_[1].advance(timer1_carry);
 		posit_interrupt((timer1_did_reload ? 0x01 : 0x00) | (timer2_did_reload ? 0x02 : 0x00));
 	}
 }