some uncommitted old mapper code

apparently from 2011

pico/cart.c

@@ -823,6 +823,8 @@ static void parse_carthw(const char *carthw_cfg, int *fill_sram)
         carthw_realtec_startup();
       else if (strcmp(p, "radica_mapper") == 0)
         carthw_radica_startup();
+      else if (strcmp(p, "piersolar_mapper") == 0)
+        carthw_pier_startup();
       else if (strcmp(p, "prot_lk3") == 0)
         carthw_prot_lk3_startup();
       else {

pico/carthw.cfg

@@ -10,10 +10,11 @@
 #  filled_sram - save storage needs to be initialized with FFh instead of 00h
 #  
 # mappers (hw = ...):
-#  ssf2_mapper    - used in Super Street Fighter2
-#  x_in_1_mapper  - used in many *-in-1 pirate carts
+#  ssf2_mapper      - used in Super Street Fighter2
+#  x_in_1_mapper    - used in many *-in-1 pirate carts
 #  realtec_mapper
-#  radica_mapper  - similar to x_in_1_mapper
+#  radica_mapper    - similar to x_in_1_mapper
+#  piersolar_mapper - used in Pier Solar
 #
 # save storage memory range (inclusive, overrides ROM header):
 #  sram_range = <start, end>
@@ -65,6 +66,14 @@ check_str = 0x150, "SUPER STREET FIGHTER2 The New Challengers"
 hw = ssf2_mapper
 prop = no_sram
 
+# The Pier Solar mapper, custom eeprom location
+[Pier Solar and the Great Architects]
+check_str = 0x150, "PIER SOLAR™&THE GREAT ARCHITECTS© WaterMelon™"
+hw = piersolar_mapper
+sram_range = 0xa13009,0xa1300b
+eeprom_type = 3
+eeprom_lines = 2,1,0
+
 # 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

@@ -1,6 +1,6 @@
 /*
  * Support for a few cart mappers and some protection.
- * (C) notaz, 2008,2009,2010
+ * (C) notaz, 2008-2011
  *
  * This work is licensed under the terms of MAME license.
  * See COPYING file in the top-level directory.
@@ -11,7 +11,7 @@
 
 
 /* The SSFII mapper */
-unsigned char ssf2_banks[8];
+static unsigned char ssf2_banks[8];
 
 static carthw_state_chunk carthw_ssf2_state[] =
 {
@@ -261,25 +261,205 @@ void carthw_radica_startup(void)
 	carthw_chunks     = carthw_Xin1_state;
 }
 
+
+/* Pier Solar. Based on my own research */
+static unsigned char pier_regs[8];
+static unsigned char pier_dump_prot;
+
+static carthw_state_chunk carthw_pier_state[] =
+{
+  { CHUNK_CARTHW,     sizeof(pier_regs),      pier_regs },
+  { CHUNK_CARTHW + 1, sizeof(pier_dump_prot), &pier_dump_prot },
+  { 0,                0,                      NULL }
+};
+
+static void carthw_pier_write8(u32 a, u32 d)
+{
+  u32 a8, target, base;
+
+  if ((a & 0xffff00) != 0xa13000) {
+    PicoWrite8_io(a, d);
+    return;
+  }
+
+  a8 = a & 0x0f;
+  pier_regs[a8 / 2] = d;
+
+      elprintf(EL_UIO, "pier w8  [%06x] %02x @%06x", a, d & 0xffff, SekPc);
+  switch (a8) {
+    case 0x01:
+      break;
+    case 0x03:
+      if (!(pier_regs[0] & 2))
+        goto unmapped;
+      target = 0x280000;
+      base = d << 19;
+      goto do_map;
+    case 0x05:
+      if (!(pier_regs[0] & 2))
+        goto unmapped;
+      target = 0x300000;
+      base = d << 19;
+      goto do_map;
+    case 0x07:
+      if (!(pier_regs[0] & 2))
+        goto unmapped;
+      target = 0x380000;
+      base = d << 19;
+      goto do_map;
+    case 0x09:
+      // TODO
+      break;
+    case 0x0b:
+      // eeprom read
+    default:
+    unmapped:
+      //elprintf(EL_UIO, "pier w8  [%06x] %02x @%06x", a, d & 0xffff, SekPc);
+      elprintf(EL_STATUS, "-- unmapped w8 [%06x] %02x @%06x", a, d & 0xffff, SekPc);
+      break;
+  }
+  return;
+
+do_map:
+  if (base + 0x80000 > Pico.romsize) {
+    elprintf(EL_ANOMALY|EL_STATUS, "pier: missing bank @ %06x", base);
+    return;
+  }
+  cpu68k_map_set(m68k_read8_map,  target, target + 0x80000 - 1, Pico.rom + base, 0);
+  cpu68k_map_set(m68k_read16_map, target, target + 0x80000 - 1, Pico.rom + base, 0);
+}
+
+static void carthw_pier_write16(u32 a, u32 d)
+{
+  if ((a & 0xffff00) != 0xa13000) {
+    PicoWrite16_io(a, d);
+    return;
+  }
+
+  elprintf(EL_UIO, "pier w16 [%06x] %04x @%06x", a, d & 0xffff, SekPc);
+  carthw_pier_write8(a + 1, d);
+}
+
+static u32 carthw_pier_read8(u32 a)
+{
+  if ((a & 0xffff00) != 0xa13000)
+    return PicoRead8_io(a);
+
+  if (a == 0xa1300b)
+    return 0; // TODO
+
+  elprintf(EL_UIO, "pier r8  [%06x] @%06x", a, SekPc);
+  return 0;
+}
+
+static void carthw_pier_statef(void);
+
+static u32 carthw_pier_prot_read8(u32 a)
+{
+  /* it takes more than just these reads here to disable ROM protection,
+   * but for game emulation purposes this is enough. */
+  if (pier_dump_prot > 0)
+    pier_dump_prot--;
+  if (pier_dump_prot == 0) {
+    carthw_pier_statef();
+    elprintf(EL_STATUS, "prot off on r8 @%06x", SekPc);
+  }
+  elprintf(EL_UIO, "pier r8  [%06x] @%06x", a, SekPc);
+
+  return Pico.rom[(a & 0x7fff) ^ 1];
+}
+
+static void carthw_pier_mem_setup(void)
+{
+  cpu68k_map_set(m68k_write8_map,  0xa10000, 0xa1ffff, carthw_pier_write8, 1);
+  cpu68k_map_set(m68k_write16_map, 0xa10000, 0xa1ffff, carthw_pier_write16, 1);
+  cpu68k_map_set(m68k_read8_map,   0xa10000, 0xa1ffff, carthw_pier_read8, 1);
+}
+
+static void carthw_pier_prot_mem_setup(int prot_enable)
+{
+  if (prot_enable) {
+    /* the dump protection.. */
+    int a;
+    for (a = 0x000000; a < 0x400000; a += M68K_BANK_SIZE) {
+      cpu68k_map_set(m68k_read8_map,  a, a + 0xffff, Pico.rom + Pico.romsize, 0);
+      cpu68k_map_set(m68k_read16_map, a, a + 0xffff, Pico.rom + Pico.romsize, 0);
+    }
+    cpu68k_map_set(m68k_read8_map, M68K_BANK_SIZE, M68K_BANK_SIZE * 2 - 1,
+      carthw_pier_prot_read8, 1);
+  }
+  else {
+    cpu68k_map_set(m68k_read8_map,  0, 0x27ffff, Pico.rom, 0);
+    cpu68k_map_set(m68k_read16_map, 0, 0x27ffff, Pico.rom, 0);
+  }
+}
+
+static void carthw_pier_statef(void)
+{
+  carthw_pier_prot_mem_setup(pier_dump_prot);
+
+  if (!pier_dump_prot) {
+    /* setup all banks */
+    u32 r0 = pier_regs[0];
+    carthw_pier_write8(0xa13001, 3);
+    carthw_pier_write8(0xa13003, pier_regs[1]);
+    carthw_pier_write8(0xa13005, pier_regs[2]);
+    carthw_pier_write8(0xa13007, pier_regs[3]);
+    carthw_pier_write8(0xa13001, r0);
+  }
+}
+
+static void carthw_pier_reset(void)
+{
+  pier_regs[0] = 1;
+  pier_regs[1] = pier_regs[2] = pier_regs[3] = 0;
+  pier_dump_prot = 3;
+  carthw_pier_statef();
+}
+
+void carthw_pier_startup(void)
+{
+  int i;
+
+  elprintf(EL_STATUS, "Pier Solar mapper startup");
+
+  // mostly same as for realtec..
+  i = PicoCartResize(Pico.romsize + M68K_BANK_SIZE);
+  if (i != 0) {
+    elprintf(EL_STATUS, "OOM");
+    return;
+  }
+
+  // create dump protection bank
+  for (i = 0; i < M68K_BANK_SIZE; i += 0x8000)
+    memcpy(Pico.rom + Pico.romsize + i, Pico.rom, 0x8000);
+
+  PicoCartMemSetup  = carthw_pier_mem_setup;
+  PicoResetHook     = carthw_pier_reset;
+  PicoLoadStateHook = carthw_pier_statef;
+  carthw_chunks     = carthw_pier_state;
+}
+
 /* Simple unlicensed ROM protection emulation */
 static struct {
-	u32 addr;
-	u32 mask;
-	u16 val;
-	u16 readonly;
+  u32 addr;
+  u32 mask;
+  u16 val;
+  u16 readonly;
 } *sprot_items;
 static int sprot_item_alloc;
 static int sprot_item_count;
 
 static u16 *carthw_sprot_get_val(u32 a, int rw_only)
 {
-	int i;
+  int i;
 
-	for (i = 0; i < sprot_item_count; i++)
-		if ((a & sprot_items[i].mask) == sprot_items[i].addr)
-			if (!rw_only || !sprot_items[i].readonly)
-				return &sprot_items[i].val;
-	return NULL;
+  for (i = 0; i < sprot_item_count; i++)
+    if ((a & sprot_items[i].mask) == sprot_items[i].addr)
+      if (!rw_only || !sprot_items[i].readonly)
+        return &sprot_items[i].val;
+
+  return NULL;
 }
 
 static u32 PicoRead8_sprot(u32 a)

pico/carthw/carthw.h

@@ -19,6 +19,7 @@ void carthw_ssf2_startup(void);
 void carthw_Xin1_startup(void);
 void carthw_realtec_startup(void);
 void carthw_radica_startup(void);
+void carthw_pier_startup(void);
 
 void carthw_sprot_startup(void);
 void carthw_sprot_new_location(unsigned int a,