From 0b85aa8c6991e91f9927f4d77e3f6bf5600dd36c Mon Sep 17 00:00:00 2001
From: Mike Pavone <pavone@retrodev.com>
Date: Sun, 15 Sep 2013 23:49:09 -0700
Subject: Clear the low 2 bits of CD when a register is written to

---
 vdp.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'vdp.c')

diff --git a/vdp.c b/vdp.c
index f1f28fc..efe7dac 100644
--- a/vdp.c
+++ b/vdp.c
@@ -1489,6 +1489,7 @@ int vdp_control_port_write(vdp_context * context, uint16_t value)
 						context->framebuf = context->oddbuf;
 					}
 				}
+				context->cd &= 0x3C;
 			}
 		} else {
 			context->flags |= FLAG_PENDING;
-- 
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