From e9347168e61c071e04edfb397d050652ce0780cf Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Fri, 28 Jul 2023 10:53:02 -0400
Subject: [PATCH] Don't alter the data bank upon BRK, COP, IRQ, etc.

---
 Processors/65816/Implementation/65816Implementation.hpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Processors/65816/Implementation/65816Implementation.hpp b/Processors/65816/Implementation/65816Implementation.hpp
index bbb9dcedc..230d3723a 100644
--- a/Processors/65816/Implementation/65816Implementation.hpp
+++ b/Processors/65816/Implementation/65816Implementation.hpp
@@ -441,7 +441,9 @@ template <typename BusHandler, bool uses_ready_line> void Processor<BusHandler,
 					if(registers_.emulation_flag) {
 						if(exception_is_interrupt_) data_buffer_.value &= ~uint32_t(Flag::Break);
 						data_buffer_.size = 3;
-						registers_.data_bank = 0;
+						if(pending_exceptions_ & (Reset | PowerOn)) {
+							registers_.data_bank = 0;
+						}
 						++next_op_;
 					} else {
 						data_buffer_.value |= registers_.program_bank << 8;	// The PBR is always held such that