public release of panzgb

2025-11-24 13:37:49 +01:00
commit d08fbfe1aa
18 changed files with 3827 additions and 0 deletions
--- a/lib/mbc3.c
+++ b/lib/mbc3.c
@@ -0,0 +1,30 @@
+#include "gb-impl.h"
+
+void mbc3_changeBank(gb *cpu, WORD addr, BYTE data) {
+    // RAM enabling
+    if (addr < 0x2000) {
+        BYTE testData = data & 0xF;
+        if (testData == 0x0) {
+            cpu->isRAMEnable = 0;
+        } else
+            cpu->isRAMEnable = 1;
+    }
+
+    /*Change ROM bank*/
+    else if ((addr >= 0x2000) && (addr < 0x4000)) {
+        BYTE lower7 = data & 0x7F;
+        cpu->currentROMBank = lower7;
+        if (cpu->currentROMBank == 0x00)
+            cpu->currentROMBank = 1;
+
+    }
+
+    else if ((addr >= 0x4000) && (addr < 0x6000)) {
+        if (data <= 0x3)
+            cpu->currentRAMBank = data & 0x3;
+    }
+
+    /*Should handle the timer*/
+    else if ((addr >= 0x6000) && (addr < 0x8000)) {
+    }
+}