core, more superfighter mapper stuff

pico/cart.c

@@ -1137,6 +1137,8 @@ static void parse_carthw(const char *carthw_cfg, int *fill_sram,
         carthw_sf001_startup();
       else if (strcmp(p, "sf002_mapper") == 0)
         carthw_sf002_startup();
+      else if (strcmp(p, "sf004_mapper") == 0)
+        carthw_sf004_startup();
       else if (strcmp(p, "prot_lk3") == 0)
         carthw_prot_lk3_startup();
       else {

pico/carthw.cfg

@@ -16,8 +16,7 @@
 #  realtec_mapper
 #  radica_mapper    - similar to x_in_1_mapper
 #  piersolar_mapper - used in Pier Solar
-#  sf001_mapper
-#  sf002_mapper
+#  sf00x_mapper     - versions x=1,2,4 used by superfighter team
 #
 # save storage memory range (inclusive, overrides ROM header):
 #  sram_range = <start, end>
@@ -103,6 +102,12 @@ prop = filled_sram
 check_str = 0x150, "LEGEND OF WUKONG"
 hw = sf002_mapper
 
+# Star Odyssey, r/w in SRAM mirror (double SRAM as a kludge)
+[Star Odyssey]
+check_str = 0x150, "STAR ODYSSEY"
+hw = sf004_mapper
+sram_range = 0x200000,0x207fff
+
 # detect *_in_1 based on first game and if it's larger than it should be,
 # as some dumps look like to be incomplete.
 # This will also pick overdumps, but those should still work with the mapper applied.

pico/carthw/carthw.c

@@ -483,7 +483,7 @@ void carthw_pier_startup(void)
   carthw_chunks     = carthw_pier_state;
 }
 
-/* superfighter mappers */
+/* superfighter mappers, see mame: mame/src/devices/bus/megadrive/rom.cpp */
 unsigned int carthw_sf00x_reg;
 
 static carthw_state_chunk carthw_sf00x_state[] =
@@ -492,37 +492,39 @@ static carthw_state_chunk carthw_sf00x_state[] =
 	{ 0,            0,                         NULL }
 };
 
-// hack to remap SRAM from 0x400000 to 0x3c0000 (there are 2 versions of sf001)
-u32 carthw_sf001_read8_sram(u32 a)
+// SF-001
+
+// additionally map SRAM at 0x3c0000 for the newer version of sf001
+static u32 carthw_sf001_read8_sram(u32 a)
 {
-  return m68k_read8((a & 0xffff) + 0x400000);
+  return m68k_read8((a & 0xffff) + Pico.sv.start);
 }
 
-u32 carthw_sf001_read16_sram(u32 a)
+static u32 carthw_sf001_read16_sram(u32 a)
 {
-  return m68k_read16((a & 0xffff) + 0x400000);
+  return m68k_read16((a & 0xffff) + Pico.sv.start);
 }
 
-void carthw_sf001_write8_sram(u32 a, u32 d)
+static void carthw_sf001_write8_sram(u32 a, u32 d)
 {
-  m68k_write8((a & 0xffff) + 0x400000, d);
+  m68k_write8((a & 0xffff) + Pico.sv.start, d);
 }
 
-void carthw_sf001_write16_sram(u32 a, u32 d)
+static void carthw_sf001_write16_sram(u32 a, u32 d)
 {
-  m68k_write16((a & 0xffff) + 0x400000, d);
+  m68k_write16((a & 0xffff) + Pico.sv.start, d);
 }
 
-void carthw_sf001_write8(u32 a, u32 d)
+static void carthw_sf001_write8(u32 a, u32 d)
 {
-  if ((a & 0xf00) != 0x0e00)
+  if ((a & 0xf00) != 0xe00 || (carthw_sf00x_reg & 0x20)) // wrong addr / locked
     return;
 
   if (d & 0x80) {
     // bank 0xe at addr 0x000000
     cpu68k_map_set(m68k_read8_map,  0x000000, 0x040000-1, Pico.rom+0x380000, 0);
     cpu68k_map_set(m68k_read16_map, 0x000000, 0x040000-1, Pico.rom+0x380000, 0);
-    // SRAM at 0x3c0000; hack to map SRAM from old to new location
+    // SRAM also at 0x3c0000 for newer mapper version
     cpu68k_map_set(m68k_read8_map,  0x3c0000, 0x400000-1, carthw_sf001_read8_sram, 1);
     cpu68k_map_set(m68k_read16_map, 0x3c0000, 0x400000-1, carthw_sf001_read16_sram, 1);
     cpu68k_map_set(m68k_write8_map, 0x3c0000, 0x400000-1, carthw_sf001_write8_sram, 1);
@@ -540,25 +542,29 @@ void carthw_sf001_write8(u32 a, u32 d)
   carthw_sf00x_reg = d;
 }
 
-void carthw_sf001_write16(u32 a, u32 d)
+static void carthw_sf001_write16(u32 a, u32 d)
 {
   carthw_sf001_write8(a + 1, d);
 }
 
 static void carthw_sf001_mem_setup(void)
 {
+  // writing to low cartridge addresses
   cpu68k_map_set(m68k_write8_map,  0x000000, 0x00ffff, carthw_sf001_write8, 1);
   cpu68k_map_set(m68k_write16_map, 0x000000, 0x00ffff, carthw_sf001_write16, 1);
 }
 
 static void carthw_sf001_reset(void)
 {
+  carthw_sf00x_reg = 0;
   carthw_sf001_write8(0x0e01, 0);
 }
 
 static void carthw_sf001_statef(void)
 {
-  carthw_sf001_write8(0x0e01, carthw_sf00x_reg);
+  int reg = carthw_sf00x_reg;
+  carthw_sf00x_reg = 0;
+  carthw_sf001_write8(0x0e01, reg);
 }
 
 void carthw_sf001_startup(void)
@@ -569,10 +575,11 @@ void carthw_sf001_startup(void)
   carthw_chunks     = carthw_sf00x_state;
 }
 
+// SF-002
 
-void carthw_sf002_write8(u32 a, u32 d)
+static void carthw_sf002_write8(u32 a, u32 d)
 {
-  if ((a & 0xf00) != 0x0e00)
+  if ((a & 0xf00) != 0xe00)
     return;
 
   if (d & 0x80) {
@@ -587,13 +594,14 @@ void carthw_sf002_write8(u32 a, u32 d)
   carthw_sf00x_reg = d;
 }
 
-void carthw_sf002_write16(u32 a, u32 d)
+static void carthw_sf002_write16(u32 a, u32 d)
 {
   carthw_sf002_write8(a + 1, d);
 }
 
 static void carthw_sf002_mem_setup(void)
 {
+  // writing to low cartridge addresses
   cpu68k_map_set(m68k_write8_map,  0x000000, 0x00ffff, carthw_sf002_write8, 1);
   cpu68k_map_set(m68k_write16_map, 0x000000, 0x00ffff, carthw_sf002_write16, 1);
 }
@@ -616,6 +624,104 @@ void carthw_sf002_startup(void)
   carthw_chunks     = carthw_sf00x_state;
 }
 
+// SF-004
+
+// reading from cartridge I/O region returns the current bank index
+static u32 carthw_sf004_read8(u32 a)
+{
+  if ((a & ~0xff) == 0xa13000)
+    return carthw_sf00x_reg & 0xf0; // bank index
+  return PicoRead8_io(a);
+}
+
+static u32 carthw_sf004_read16(u32 a)
+{
+  if ((a & ~0xff) == 0xa13000)
+    return carthw_sf00x_reg & 0xf0;
+  return PicoRead16_io(a);
+}
+
+// writing to low cartridge adresses changes mappings
+static void carthw_sf004_write8(u32 a, u32 d)
+{
+  int idx, i;
+  unsigned bs = 0x40000; // bank size
+
+  // there are 3 byte-sized regs, stored together in carthw_sf00x_reg
+  if (!(carthw_sf00x_reg & 0x8000))
+    return; // locked
+
+  switch (a & 0xf00) {
+  case 0xd00:
+    carthw_sf00x_reg = (carthw_sf00x_reg & ~0xff0000) | ((d & 0xff) << 16);
+    return PicoWrite8_io(0xa130f1, (d & 0x80) ? SRR_MAPPED : 0); // SRAM mapping
+  case 0xe00:
+    carthw_sf00x_reg = (carthw_sf00x_reg & ~0x00ff00) | ((d & 0xff) << 8);
+    break;
+  case 0xf00:
+    carthw_sf00x_reg = (carthw_sf00x_reg & ~0x0000ff) | ((d & 0xff) << 0);
+    break;
+  default:
+    return; // wrong addr
+  }
+
+  // bank mapping changed
+  idx = ((carthw_sf00x_reg>>4) & 0x7); // bank index
+  if ((carthw_sf00x_reg>>8) & 0x40) {
+    // linear bank mapping, starting at idx
+    for (i = 0; i < 8; i++, idx = (idx+1) & 0x7) {
+      cpu68k_map_set(m68k_read8_map,  i*bs, (i+1)*bs-1, Pico.rom + idx*bs, 0);
+      cpu68k_map_set(m68k_read16_map, i*bs, (i+1)*bs-1, Pico.rom + idx*bs, 0);
+    }
+  } else {
+    // single bank mapping
+    for (i = 0; i < 8; i++) {
+      cpu68k_map_set(m68k_read8_map,  i*bs, (i+1)*bs-1, Pico.rom + idx*bs, 0);
+      cpu68k_map_set(m68k_read16_map, i*bs, (i+1)*bs-1, Pico.rom + idx*bs, 0);
+    }
+  }
+}
+
+static void carthw_sf004_write16(u32 a, u32 d)
+{
+  carthw_sf004_write8(a + 1, d);
+}
+
+static void carthw_sf004_mem_setup(void)
+{
+  // writing to low cartridge addresses
+  cpu68k_map_set(m68k_write8_map,  0x000000, 0x00ffff, carthw_sf004_write8, 1);
+  cpu68k_map_set(m68k_write16_map, 0x000000, 0x00ffff, carthw_sf004_write16, 1);
+  // reading from the cartridge I/O region
+  cpu68k_map_set(m68k_read8_map,   0xa10000, 0xa1ffff, carthw_sf004_read8, 1);
+  cpu68k_map_set(m68k_read16_map,  0xa10000, 0xa1ffff, carthw_sf004_read16, 1);
+}
+
+static void carthw_sf004_reset(void)
+{
+  carthw_sf00x_reg = -1;
+  carthw_sf004_write8(0x0d01, 0);
+  carthw_sf004_write8(0x0f01, 0);
+  carthw_sf004_write8(0x0e01, 0x80);
+}
+
+static void carthw_sf004_statef(void)
+{
+  int reg = carthw_sf00x_reg;
+  carthw_sf00x_reg = -1;
+  carthw_sf004_write8(0x0d01, reg >> 16);
+  carthw_sf004_write8(0x0f01, reg >> 0);
+  carthw_sf004_write8(0x0e01, reg >> 8);
+}
+
+void carthw_sf004_startup(void)
+{
+  PicoCartMemSetup  = carthw_sf004_mem_setup;
+  PicoResetHook     = carthw_sf004_reset;
+  PicoLoadStateHook = carthw_sf004_statef;
+  carthw_chunks     = carthw_sf00x_state;
+}
+
 /* Simple unlicensed ROM protection emulation */
 static struct {
   u32 addr;

pico/carthw/carthw.h

@@ -26,6 +26,9 @@ void carthw_Xin1_startup(void);
 void carthw_realtec_startup(void);
 void carthw_radica_startup(void);
 void carthw_pier_startup(void);
+void carthw_sf001_startup(void);
+void carthw_sf002_startup(void);
+void carthw_sf004_startup(void);
 
 void carthw_sprot_startup(void);
 void carthw_sprot_new_location(unsigned int a,

pico/carthw_cfg.c

@@ -45,10 +45,15 @@ static const char builtin_carthw_cfg[] =
   "check_str=0x150,\"BEGGAR PRINCE\"\n"
   "hw=sf001_mapper\n"
   "sram_range=0x400000,0x40ffff\n"
+  "prop=filled_sram\n"
   "[]\n"
   "check_str=0x150,\"LEGEND OF WUKONG\"\n"
   "hw=sf002_mapper\n"
   "[]\n"
+  "check_str=0x150,\"STAR ODYSSEY\"\n"
+  "hw=sf004_mapper\n"
+  "sram_range=0x200000,0x207fff\n"
+  "[]\n"
   "check_str=0x120,\"FLICKY\"\n"
   "check_size_gt=0x020000\n"
   "hw=x_in_1_mapper\n"