12-in-1 + realtec mapper

[picodrive.git] / Pico / carthw / carthw.c

diff --git a/Pico/carthw/carthw.c b/Pico/carthw/carthw.c
index 1e92e86..c3e80f8 100644 (file)
--- a/Pico/carthw/carthw.c
+++ b/Pico/carthw/carthw.c
@@ -1,6 +1,12 @@
+/*
+ * should better do some pointer stuff here. But as none of these bankswitch
+ * while the game runs, memcpy will suffice.
+ */
+
 #include "../PicoInt.h"
 
-/* 12-in-1 */
+
+/* 12-in-1 and 4-in-1. Assuming 2MB ROMs here. */
 static unsigned int carthw_12in1_read16(unsigned int a, int realsize)
 {
        // ??
@@ -13,7 +19,11 @@ static void carthw_12in1_write8(unsigned int a, unsigned int d, int realsize)
        int len;
 
        if (a < 0xA13000 || a >= 0xA13040) {
-               elprintf(EL_ANOMALY, "12-in-1: unexpected write [%06x] %02x @ %06x", a, d, SekPc);
+               /* 4-in-1 has Real Deal Boxing, which uses serial eeprom,
+                * but I really doubt that pirate cart had it */
+               if (a != 0x200001)
+                       elprintf(EL_ANOMALY, "12-in-1: unexpected write [%06x] %02x @ %06x", a, d, SekPc);
+               return;
        }
 
        a &= 0x3f; a <<= 16;
@@ -23,7 +33,7 @@ static void carthw_12in1_write8(unsigned int a, unsigned int d, int realsize)
                return;
        }
 
-       memcpy(Pico.rom, Pico.rom + 0x200000 + a, len);
+       memcpy(Pico.rom, Pico.rom + Pico.romsize + a, len);
 }
 
 static void carthw_12in1_reset(void)
@@ -37,16 +47,96 @@ void carthw_12in1_startup(void)
 
        elprintf(EL_STATUS, "12-in-1 mapper detected");
 
-       tmp = realloc(Pico.rom, 0x200000 + 0x200000);
+       tmp = realloc(Pico.rom, Pico.romsize * 2);
        if (tmp == NULL)
        {
                elprintf(EL_STATUS, "OOM");
                return;
        }
-       memcpy(Pico.rom + 0x200000, Pico.rom, 0x200000);
+       Pico.rom = tmp;
+       memcpy(Pico.rom + Pico.romsize, Pico.rom, Pico.romsize);
 
        PicoRead16Hook = carthw_12in1_read16;
        PicoWrite8Hook = carthw_12in1_write8;
        PicoResetHook  = carthw_12in1_reset;
 }
 
+
+/* Realtec, based on TascoDLX doc
+ * http://www.sharemation.com/TascoDLX/REALTEC%20Cart%20Mapper%20-%20description%20v1.txt
+ */
+static int realtec_bank = 0x80000000, realtec_size = 0x80000000;
+static int realtec_romsize = 0;
+
+static void carthw_realtec_write8(unsigned int a, unsigned int d, int realsize)
+{
+       int i, bank_old = realtec_bank, size_old = realtec_size;
+
+       if (a == 0x400000)
+       {
+               realtec_bank &= 0x0e0000;
+               realtec_bank |= 0x300000 & (d << 19);
+               if (realtec_bank != bank_old)
+                       elprintf(EL_ANOMALY, "write [%06x] %02x @ %06x", a, d, SekPc);
+       }
+       else if (a == 0x402000)
+       {
+               realtec_size = (d << 17) & 0x3e0000;
+               if (realtec_size != size_old)
+                       elprintf(EL_ANOMALY, "write [%06x] %02x @ %06x", a, d, SekPc);
+       }
+       else if (a == 0x404000)
+       {
+               realtec_bank &= 0x300000;
+               realtec_bank |= 0x0e0000 & (d << 17);
+               if (realtec_bank != bank_old)
+                       elprintf(EL_ANOMALY, "write [%06x] %02x @ %06x", a, d, SekPc);
+       }
+       else
+               elprintf(EL_ANOMALY, "realtec: unexpected write [%06x] %02x @ %06x", a, d, SekPc);
+       
+       if (realtec_bank >= 0 && realtec_size >= 0 &&
+               (realtec_bank != bank_old || realtec_size != size_old))
+       {
+               elprintf(EL_ANOMALY, "realtec: new bank %06x, size %06x", realtec_bank, realtec_size, SekPc);
+               if (realtec_size > realtec_romsize - realtec_bank || realtec_bank >= realtec_romsize)
+               {
+                       elprintf(EL_ANOMALY, "realtec: bank too large / out of range?");
+                       return;
+               }
+
+               for (i = 0; i < 0x400000; i += realtec_size)
+                       memcpy(Pico.rom + i, Pico.rom + 0x400000 + realtec_bank, realtec_size);
+       }
+}
+
+void carthw_realtec_reset(void)
+{
+       int i;
+       /* map boot code */
+       for (i = 0; i < 0x400000; i += 0x2000)
+               memcpy(Pico.rom + i, Pico.rom + 0x400000 + realtec_romsize - 0x2000, 0x2000);
+       realtec_bank = realtec_size = 0x80000000;
+}
+
+void carthw_realtec_startup(void)
+{
+       void *tmp;
+
+       elprintf(EL_STATUS, "Realtec mapper detected");
+
+       realtec_romsize = Pico.romsize;
+       Pico.romsize = 0x400000;
+       tmp = realloc(Pico.rom, 0x400000 + realtec_romsize);
+       if (tmp == NULL)
+       {
+               elprintf(EL_STATUS, "OOM");
+               return;
+       }
+       Pico.rom = tmp;
+       memcpy(Pico.rom + 0x400000, Pico.rom, realtec_romsize);
+
+       PicoWrite8Hook = carthw_realtec_write8;
+       PicoResetHook = carthw_realtec_reset;
+}
+