BNROM, some fixes

ClusterM · Sep 29, 2016 · 459157a · 459157a
1 parent 6af40f1
commit 459157a
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Showing 2 changed files with 4 additions and 2 deletions.
diff --git a/CoolGirl.v b/CoolGirl.v
@@ -25,6 +25,7 @@ module CoolGirl # (
 		parameter USE_MAPPER_163 = 0,					// mapper #163
 		parameter USE_MAPPER_189 = 1,					// mapper #189
 		parameter USE_MAPPER_228 = 1, 				// mapper #228 - Cheetahmen II only
+		parameter USE_MAPPER_241 = 1, 				// mapper #241 - BNROM
 
 		parameter USE_FOUR_SCREEN = 1
 	)

diff --git a/mappers.vh b/mappers.vh
@@ -530,11 +530,12 @@
 					endcase
 				end
 
-				// Mapper #7 - AxROM
+				// Mapper #7 - AxROM, mapper #241 - BNROM
 				if (mapper == 5'b01000)
 				begin
 					prg_bank_a[5:2] = cpu_data_in[3:0];
-					mirroring = {1'b1, cpu_data_in[4]};
+					if (!USE_MAPPER_241 || !flags[0]) // BNROM?
+						mirroring = {1'b1, cpu_data_in[4]};
 				end
 
 				// Mapper #228 - Cheetahmen II