runs code in 1M wram, cell arrange, decode (untested)

[picodrive.git] / Pico / cd / Misc.c

diff --git a/Pico/cd/Misc.c b/Pico/cd/Misc.c
index 3ea974b..905e919 100644 (file)
--- a/Pico/cd/Misc.c
+++ b/Pico/cd/Misc.c
@@ -1,16 +1,56 @@
 
 
-unsigned char formatted_bram[8*0x10] =
+unsigned char formatted_bram[4*0x10] =
 {
+#if 0
        0x00, 0xd4, 0x63, 0x00, 0x00, 0x03, 0x03, 0x00, 0x03, 0x03, 0x03, 0x00, 0x03, 0x00, 0x00, 0x03,
        0x00, 0x03, 0x00, 0x00, 0x00, 0x03, 0x03, 0x00, 0x53, 0xd2, 0xf5, 0x3a, 0x48, 0x50, 0x35, 0x0f,
        0x47, 0x14, 0xf5, 0x7e, 0x5c, 0xd4, 0xf3, 0x03, 0x00, 0x03, 0x12, 0x00, 0x0a, 0xff, 0xca, 0xa6,
        0xf5, 0x27, 0xed, 0x22, 0x47, 0xfa, 0x22, 0x96, 0x6c, 0xa5, 0x88, 0x14, 0x48, 0x48, 0x0a, 0xbb,
+#endif
        0x5f, 0x5f, 0x5f, 0x5f, 0x5f, 0x5f, 0x5f, 0x5f, 0x5f, 0x5f, 0x5f, 0x00, 0x00, 0x00, 0x00, 0x40,
        0x00, 0x7d, 0x00, 0x7d, 0x00, 0x7d, 0x00, 0x7d, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x53, 0x45, 0x47, 0x41, 0x5f, 0x43, 0x44, 0x5f, 0x52, 0x4f, 0x4d, 0x00, 0x01, 0x00, 0x00, 0x00,
        0x52, 0x41, 0x4d, 0x5f, 0x43, 0x41, 0x52, 0x54, 0x52, 0x49, 0x44, 0x47, 0x45, 0x5f, 0x5f, 0x5f,
-       // SEGA_CD_ROM.....RAM_CART
+       // SEGA_CD_ROM.....RAM_CARTRIDGE___
 };
 
 
+// offs | 2Mbit  | 1Mbit  |
+//   0  | [ 2M   | unused |
+// 128K |  bit ] | bank0  |
+// 256K | unused | bank1  |
+
+void wram_2M_to_1M(unsigned char *m)
+{
+       unsigned short *m1M_b0, *m1M_b1;
+       unsigned int i, tmp, *m2M;
+
+       m2M = (unsigned int *) (m + 0x40000);
+       m1M_b0 = (unsigned short *) m2M;
+       m1M_b1 = (unsigned short *) (m + 0x60000);
+
+       for (i = 0x40000/4; i; i--)
+       {
+               tmp = *(--m2M);
+               *(--m1M_b0) = tmp;
+               *(--m1M_b1) = tmp >> 16;
+       }
+}
+
+void wram_1M_to_2M(unsigned char *m)
+{
+       unsigned short *m1M_b0, *m1M_b1;
+       unsigned int i, tmp, *m2M;
+
+       m2M = (unsigned int *) m;
+       m1M_b0 = (unsigned short *) (m + 0x20000);
+       m1M_b1 = (unsigned short *) (m + 0x40000);
+
+       for (i = 0x40000/4; i; i--)
+       {
+               tmp = *m1M_b0++ | (*m1M_b1++ << 16);
+               *m2M++ = tmp;
+       }
+}
+