diff --git a/A2Mac/DebuggerViewController.swift b/A2Mac/DebuggerViewController.swift
index ff0722c..59e81f2 100644
--- a/A2Mac/DebuggerViewController.swift
+++ b/A2Mac/DebuggerViewController.swift
@@ -414,11 +414,11 @@ N V - B D I Z C
             let line = getLine(inView: Disass_Display, forY: location.y)
             let addr = getAddr(forLine: line)
 
-            if m6502_dbg_bp_is_exists(addr) {
-                m6502_dbg_bp_del(addr)
+            if m6502_dbg_bp_exists(breakpoints, bp_last_idx, addr) {
+                bp_last_idx = m6502_dbg_bp_del(breakpoints, bp_last_idx, addr)
             }
             else {
-                m6502_dbg_bp_add(addr)
+                bp_last_idx = m6502_dbg_bp_add(breakpoints, bp_last_idx, addr)
             }
 
             // force regenerate disassembly
diff --git a/src/cpu/6502_bp.c b/src/cpu/6502_bp.c
index 62d2536..e4f96fd 100644
--- a/src/cpu/6502_bp.c
+++ b/src/cpu/6502_bp.c
@@ -35,9 +35,24 @@
 
 /// Array of addresses of active breakpoints
 /// @note DEBUG_MAX_BREAKPOINTS controls its size
-uint16_t breakpoints[DEBUG_MAX_BREAKPOINTS];
+uint16_t bp_array[DEBUG_MAX_BREAKPOINTS];
+/// Pointer to the bp_array
+/// @note We have to do this way because of interfacing problem with Swift
+uint16_t * breakpoints = bp_array;
+/// Array of addresses of memory read breakpoints
+/// @note DEBUG_MAX_BREAKPOINTS controls its size
+uint16_t mem_rd_bp[DEBUG_MAX_BREAKPOINTS];
+uint16_t * mem_read_breakpoints = mem_rd_bp;
+/// Array of addresses of memory write breakpoints
+/// @note DEBUG_MAX_BREAKPOINTS controls its size
+uint16_t mem_wr_bp[DEBUG_MAX_BREAKPOINTS];
+uint16_t * mem_write_breakpoints = mem_wr_bp;
 /// Index of last valid breakpoint element in the array
 int bp_last_idx = 0;
+/// Index of last valid breakpoint element in the array
+int bp_mem_read_last_idx = 0;
+/// Index of last valid breakpoint element in the array
+int bp_mem_write_last_idx = 0;
 /// Index of current breapoint
 /// @note It is more like a temporary variable
 int bp_idx = 0;
@@ -124,9 +139,9 @@ int m6502_dbg_bp_search(uint16_t arr[], int l, int r, uint16_t addr) {
 /// Get index of the last BP
 /// @param i Current last index
 /// @return Index of the last breakpoint or 0 if non
-int m6502_dbg_bp_get_last(int i) {
+int m6502_dbg_bp_get_last(uint16_t *bp, int i) {
     for(; i >= 0; i--) {
-        if ( breakpoints[i] ) {
+        if ( bp[i] ) {
             return i;
         }
     }
@@ -186,20 +201,21 @@ int m6502_dbg_bp_get_not_empty() {
 
 /// Move array down to eliminate leading zeros
 /// @note: Array must be sorted before this!
-void m6502_dbg_bp_compact() {
+/// @return last index
+int m6502_dbg_bp_compact(uint16_t * bp, int last) {
     int i = m6502_dbg_bp_get_not_empty();
-    memcpy(breakpoints, breakpoints + i, bp_last_idx * sizeof(uint16_t));
-    memset(breakpoints + bp_last_idx - i + 1, 0, (DEBUG_MAX_BREAKPOINTS - bp_last_idx + i - 1) * sizeof(uint16_t));
-    bp_last_idx = m6502_dbg_bp_get_last(bp_last_idx);
+    memcpy(bp, bp + i, last * sizeof(uint16_t));
+    memset(bp + last - i + 1, 0, (DEBUG_MAX_BREAKPOINTS - last + i - 1) * sizeof(uint16_t));
+    return m6502_dbg_bp_get_last(bp, last);
 }
 
 
 /// Check if BP exists
 /// @param addr Address to check
 /// @return 1 (true) if exists, 0 (false) if not
-_Bool m6502_dbg_bp_is_exists(uint16_t addr) {
+_Bool m6502_dbg_bp_exists(uint16_t * bp, int last, uint16_t addr) {
     if (addr) {
-        int i = m6502_dbg_bp_search(breakpoints, 0, bp_last_idx, addr);
+        int i = m6502_dbg_bp_search(bp, 0, last, addr);
         return i >= 0;
     }
 
@@ -209,35 +225,36 @@ _Bool m6502_dbg_bp_is_exists(uint16_t addr) {
 
 /// Add breakpoint
 /// @param addr Address to add
-/// @return Index of breakpoint or -1 if error
-int m6502_dbg_bp_add(uint16_t addr) {
-    if (bp_last_idx < DEBUG_MAX_BREAKPOINTS - 1) {
-        breakpoints[++bp_last_idx] = addr;
-        m6502_dbg_bp_sort(breakpoints, 0, bp_last_idx);
-        m6502_dbg_bp_compact();
-        return bp_last_idx;
+/// @return Index of breakpoint or 0 if error
+int m6502_dbg_bp_add(uint16_t * bp, int last, uint16_t addr) {
+    if (last < DEBUG_MAX_BREAKPOINTS - 1) {
+        bp[++last] = addr;
+        m6502_dbg_bp_sort(bp, 0, last);
+        last = m6502_dbg_bp_compact(bp, last);
+        return last;
     }
     // no empty slots
-    return -1;
+    return 0;
 }
 
 
 /// Remove a breakpoint
 /// @param addr address to remove
-void m6502_dbg_bp_del(uint16_t addr) {
-    int i = m6502_dbg_bp_search(breakpoints, 0, bp_last_idx, addr);
+int m6502_dbg_bp_del(uint16_t * bp, int last, uint16_t addr) {
+    int i = m6502_dbg_bp_search(bp, 0, last, addr);
     if (i >= 0) {
-        breakpoints[i] = 0;
-        m6502_dbg_bp_sort(breakpoints, 0, bp_last_idx);
-        m6502_dbg_bp_compact();
+        bp[i] = 0;
+        m6502_dbg_bp_sort(breakpoints, 0, last);
+        last = m6502_dbg_bp_compact(bp, last);
     }
+    return last;
 }
 
 
 /// Delete all breakpoints
-void m6502_dbg_bp_del_all(void) {
+void m6502_dbg_bp_del_all(uint16_t * bp) {
     bp_idx = 0;
-    memset(breakpoints, 0, sizeof(breakpoints));
+    memset(bp, 0, sizeof(uint16_t) * DEBUG_MAX_BREAKPOINTS);
 }
 
 
diff --git a/src/cpu/6502_bp.h b/src/cpu/6502_bp.h
index 15b107c..324d509 100644
--- a/src/cpu/6502_bp.h
+++ b/src/cpu/6502_bp.h
@@ -12,13 +12,17 @@
 #include <stdint.h>
 
 #define DEBUG_MAX_BREAKPOINTS   256
-extern uint16_t breakpoints[DEBUG_MAX_BREAKPOINTS];
+extern uint16_t * breakpoints;
+extern uint16_t * mem_read_breakpoints;
+extern uint16_t * mem_write_breakpoints;
 extern int bp_last_idx;
+extern int bp_mem_read_last_idx;
+extern int bp_mem_write_last_idx;
 
-extern int m6502_dbg_bp_add(uint16_t addr);
-extern void m6502_dbg_bp_del(uint16_t addr);
-extern void m6502_dbg_bp_del_all(void);
-extern _Bool m6502_dbg_bp_is_exists(uint16_t addr);
+extern int m6502_dbg_bp_add(uint16_t * bp, int last, uint16_t addr);
+extern int m6502_dbg_bp_del(uint16_t * bp, int last, uint16_t addr);
+extern void m6502_dbg_bp_del_all(uint16_t * bp);
+extern _Bool m6502_dbg_bp_exists(uint16_t * bp, int last, uint16_t addr);
 
 
 #endif /* _6502_bp_h */
diff --git a/src/cpu/6502_dbg.c b/src/cpu/6502_dbg.c
index c1d82a4..ba4d6ba 100644
--- a/src/cpu/6502_dbg.c
+++ b/src/cpu/6502_dbg.c
@@ -188,10 +188,10 @@ void m6502_Debug(void) {
 
         m6502.interrupt = NO_INT;
 
-        if ( m6502_dbg_bp_is_exists(m6502.PC) ) {
+        if ( m6502_dbg_bp_exists(breakpoints, bp_last_idx, m6502.PC) ) {
             cpuState = cpuState_halted;
-            //            m6502.debugger.wMask = 0;
-            //            m6502.debugger.on = 0;
+//            m6502.debugger.wMask = 0;
+//            m6502.debugger.on = 0;
             m6502.interrupt = BREAKPOINT;
             return;
         }
@@ -226,7 +226,7 @@ void m6502_dbg_init(void) {
     m6502.debugger.mask.brk = 1;
     m6502.debugger.mask.inv = 1;
     m6502.debugger.SP = 0xFF;
-    m6502_dbg_bp_del_all();
+    m6502_dbg_bp_del_all(breakpoints);
 }
 
 
diff --git a/src/cpu/6502_dis.c b/src/cpu/6502_dis.c
index f5bc3d0..f9749c5 100644
--- a/src/cpu/6502_dis.c
+++ b/src/cpu/6502_dis.c
@@ -175,7 +175,7 @@ const char * disassemblyLine(_Bool highlight) {
     static char line[256];
 
     snprintf( line, sizeof(line), "%s %s: %-11s%-4s%s",
-        m6502_dbg_bp_is_exists(disassembly.addr) ? "*" : " ",
+        m6502_dbg_bp_exists(breakpoints, bp_last_idx, disassembly.addr) ? "*" : " ",
         disassembly.hexAddr,
         disassembly.opcode,
         disassembly.inst,