Added extra NES ROM options.

3 files changed, 68 insertions, 13 deletions

diff --git a/doc/casm.html b/doc/casm.html
index 5581eba..014262e 100644
--- a/doc/casm.html
+++ b/doc/casm.html
@@ -1403,6 +1403,22 @@ option nes-tv-format, pal|ntsc
 Defines the TV format stored in the ROM header, defaulting to <b>pal</b>.
 </td></tr>
 
+<tr><td class="cmd">
+option nes-mirror, horizontal|vertical|vram
+</td>
+<td class="def">
+Defines whether nametables are mirrored horizontally, vertically or not at
+all respectively.  Defaults to <b>horizontal</b>.
+</td></tr>
+
+<tr><td class="cmd">
+option nes-battery-ram, on|off
+</td>
+<td class="def">
+Defines whether there is battery backed RAM in the cartridge.  Defaults to 
+<b>off</b>.
+</td></tr>
+
 </table>
 
 
diff --git a/src/example/nes.asm b/src/example/nes.asm
index 8228914..4598a41 100644
--- a/src/example/nes.asm
+++ b/src/example/nes.asm
@@ -6,6 +6,7 @@
 	option  nes-vector,reset,start
 	option  nes-vector,nmi,nmi
 	option  nes-vector,brk,nmi
+	option	nes-mirror,horizontal
 
 vsync:	macro
 .wait
@@ -15,18 +16,27 @@ vsync:	macro
 
 start:	org	$c000
 
-	sei
+	; Clear decimal and setup stack
+	;
 	cld
 	ldx	#$ff
 	txs
 
-	; this sets up the PPU.  Apparently.
+	; Wait for the PPU.  Recommended practice is clear the flag, and
+	; wait for 2 VBL signals
+	;
+	bit	$2002
+	vsync
+	vsync
+
+	; Setup PPU
+	;
 	lda	#%00001000     
 	sta	$2000          
 	lda	#%00011110 
 	sta	$2001
 
-	; Set PPU to palette
+	; Setup the palette
 	;
 loadpalette:
 	lda	#$3f
@@ -34,8 +44,6 @@ loadpalette:
 	lda	#$00
 	sta	$2006
 
-	; Load the palette
-	;
 	ldx	#0
 .loop	lda	palette,x
 	sta	$2007
@@ -52,7 +60,7 @@ loadpalette:
 load_namemap:
 	lda	#$20
 	sta	$2006
-	lda	#$20
+	lda	#$40
 	sta	$2006
 
 	ldx	#0
diff --git a/src/nesout.c b/src/nesout.c
index 44ab1af..8152239 100644
--- a/src/nesout.c
+++ b/src/nesout.c
@@ -45,7 +45,9 @@ enum option_t
 {
     OPT_VECTOR,
     OPT_TV_FORMAT,
-    OPT_MAPPER
+    OPT_MAPPER,
+    OPT_MIRROR,
+    OPT_BATTERY_RAM
 };
 
 static const ValueTable option_set[] =
@@ -53,6 +55,8 @@ static const ValueTable option_set[] =
     {"nes-vector",              OPT_VECTOR},
     {"nes-tv-format",           OPT_TV_FORMAT},
     {"nes-mapper",              OPT_MAPPER},
+    {"nes-mirror",              OPT_MIRROR},
+    {"nes-battery-ram",         OPT_BATTERY_RAM},
     {NULL}
 };
 
@@ -63,6 +67,19 @@ typedef enum
     VECTOR_BRK
 } VectorType;
 
+typedef enum
+{
+    MIRROR_HORIZONTAL	= 0x00,
+    MIRROR_VERTICAL	= 0x01,
+    MIRROR_VRAM		= 0x08,
+} MirrorType;
+
+typedef enum
+{
+    PAL = 1,
+    NTSC = 0
+} TVFormat;
+
 static ValueTable       vector_table[] =
 {
     {"reset",           VECTOR_RESET},
@@ -71,11 +88,13 @@ static ValueTable       vector_table[] =
     {NULL}
 };
 
-typedef enum
+static ValueTable       mirror_table[] =
 {
-    PAL = 1,
-    NTSC = 0
-} TVFormat;
+    {"horizontal",   	MIRROR_HORIZONTAL},
+    {"vertical",        MIRROR_VERTICAL},
+    {"vram",            MIRROR_VRAM},
+    {NULL}
+};
 
 static ValueTable       format_table[] =
 {
@@ -90,9 +109,11 @@ static struct
     int         vector[3];
     TVFormat    tv_format;
     int         mapper;
+    MirrorType	mirror;
+    int		battery_ram;
 } option =
 {
-    {-1, -1, -1}, PAL, 0
+    {-1, -1, -1}, PAL, 0, MIRROR_HORIZONTAL, FALSE
 };
 
 
@@ -173,6 +194,15 @@ CommandStatus NESOutputSetOption(int opt, int argc, char *argv[],
             option.mapper = f;
             break;
 
+        case OPT_MIRROR:
+            CMD_TABLE(argv[0], mirror_table, val);
+            option.mirror = val->value;
+            break;
+
+	case OPT_BATTERY_RAM:
+            option.battery_ram = ParseTrueFalse(argv[0], FALSE);
+            break;
+
         default:
             break;
     }
@@ -302,7 +332,8 @@ int NESOutput(const char *filename, const char *filename_bank,
 
     fputc(num_vrom, fp);
 
-    fputc((option.mapper & 0x0f) << 4, fp);
+    fputc(((option.mapper & 0x0f) << 4) | option.mirror | 
+                (option.battery_ram ? 0x02 : 0x00), fp);
     fputc(option.mapper & 0xf0, fp);
 
     fputc(0, fp);