diff --git a/main.cpp b/main.cpp
index d755dbb..47e9678 100644
--- a/main.cpp
+++ b/main.cpp
@@ -88,6 +88,12 @@ namespace actions
         return 0;
     }
 
+    int modePlus3(int value)
+    {
+        zx_system::reset(ZX_PLUS3);
+        return 0;
+    }
+
     int reset(int value)
     {
         z80::reset();
@@ -118,6 +124,7 @@ void init_menu()
     menu = ui::menu::addsubmenu("SYSTEM");
     ui::menu::addoption(menu, "ZX 48K", actions::mode48K);
     ui::menu::addoption(menu, "ZX 128K/+2", actions::mode128K);
+    ui::menu::addoption(menu, "ZX +2A/+3", actions::modePlus3);
     ui::menu::addseparator(menu);
     ui::menu::addoption(menu, "RESET", actions::reset);
 
diff --git a/plus3.rom b/plus3.rom
new file mode 100644
index 0000000..ba17cab
Binary files /dev/null and b/plus3.rom differ
diff --git a/zx_mem.cpp b/zx_mem.cpp
index 3cfea3d..fcd584d 100644
--- a/zx_mem.cpp
+++ b/zx_mem.cpp
@@ -8,6 +8,10 @@
 #define ZX_128MEM_ROM       0x10
 #define ZX_128MEM_DISPAG    0x20
 
+#define ZX_2A_3_PAGING_MODE 0x01
+#define ZX_2A_3_HROM        0x04
+#define ZX_2A_3_SPECIAL     0x06
+
 namespace mem
 {
     uint8_t mode = ZX_48K;
@@ -18,9 +22,11 @@ namespace mem
     uint8_t *slot[8];
     bool writable[8];
 
-    uint8_t config_128K;
+    uint8_t config_128K = 0;
+    uint8_t config_2A_3 = 0;
 
     void zx_128_port_out(int port, int val);
+    void zx_2A_3_port_out(int port, int val);
 
     void init(uint8_t mode)
     {
@@ -77,6 +83,28 @@ namespace mem
 
                 z80::connect_port(0x7ffd, 0x8002, nullptr, mem::zx_128_port_out);
                 break;
+            case ZX_PLUS3:
+                ram_size = 128*1024;
+                ram = (uint8_t*)malloc(ram_size);
+                for (int i=0x0000; i<ram_size; ++i) ram[i] = 0;
+
+                rom_size = 64*1024;
+                rom = (uint8_t*)malloc(rom_size);
+                f = fopen("plus3.rom", "rb");
+                fread(rom, rom_size, 1, f);
+                fclose(f);
+
+                slot[0] = &rom[0*8192]; slot[1] = &rom[1*8192];
+                slot[2] = &ram[10*8192]; slot[3] = &ram[11*8192];
+                slot[4] = &ram[4*8192]; slot[5] = &ram[5*8192];
+                slot[6] = &ram[0*8192]; slot[7] = &ram[1*8192];
+
+                writable[0] = writable[1] = false;
+                for (int i=2;i<8;++i) writable[i] = true;
+
+                z80::connect_port(0x7ffd, 0xc002, nullptr, mem::zx_128_port_out);
+                z80::connect_port(0x1ffd, 0xf002, nullptr, mem::zx_2A_3_port_out);
+                break;
         }
     }
 
@@ -143,19 +171,70 @@ namespace mem
 
         const bool shadow = config_128K & ZX_128MEM_SCREEN;
         config_128K = val;
+
+        if (config_2A_3 & ZX_2A_3_PAGING_MODE) return;
+
         if (config_128K & ZX_128MEM_SCREEN) {
             if (!shadow) zxscreen::setBaseAddresses(0x4000*7, 0x1800+0x4000*7);
         } else {
             if (shadow) zxscreen::setBaseAddresses(0x4000*5, 0x1800+0x4000*5);
         }
 
+        uint8_t hrom = (config_2A_3 & ZX_2A_3_HROM) ? 4 : 0;
         if (config_128K & ZX_128MEM_ROM) {
-            slot[0] = &rom[2*8192]; slot[1] = &rom[3*8192];
+            slot[0] = &rom[(hrom+2)*8192]; slot[1] = &rom[(hrom+3)*8192];
         } else {            
-            slot[0] = &rom[0*8192]; slot[1] = &rom[1*8192];
+            slot[0] = &rom[(hrom+0)*8192]; slot[1] = &rom[(hrom+1)*8192];
         }
 
         const uint8_t slot3 = (config_128K&ZX_128MEM_PAGE)*2;
         slot[6] = &ram[slot3*8192]; slot[7] = &ram[(slot3+1)*8192];
     }
+
+    void zx_2A_3_port_out(int port, int val)
+    {
+        if (port != 0x1ffd) return;
+        if (config_128K & ZX_128MEM_DISPAG) return;
+
+        config_2A_3 = val;
+        if (config_2A_3 & ZX_2A_3_PAGING_MODE) {
+            for (int i=0;i<8;++i) writable[i] = true;
+            switch ((config_2A_3 & ZX_2A_3_SPECIAL)>>1)
+            {
+                case 0:
+                    slot[0] = &ram[0*8192]; slot[1] = &ram[1*8192];
+                    slot[2] = &ram[2*8192]; slot[3] = &ram[3*8192];
+                    slot[4] = &ram[4*8192]; slot[5] = &ram[5*8192];
+                    slot[6] = &ram[6*8192]; slot[7] = &ram[7*8192];
+                    break;
+                case 1:
+                    slot[0] = &ram[8*8192]; slot[1] = &ram[9*8192];
+                    slot[2] = &ram[10*8192]; slot[3] = &ram[11*8192];
+                    slot[4] = &ram[12*8192]; slot[5] = &ram[13*8192];
+                    slot[6] = &ram[14*8192]; slot[7] = &ram[15*8192];
+                    break;
+                case 2:
+                    slot[0] = &ram[8*8192]; slot[1] = &ram[9*8192];
+                    slot[2] = &ram[10*8192]; slot[3] = &ram[11*8192];
+                    slot[4] = &ram[12*8192]; slot[5] = &ram[13*8192];
+                    slot[6] = &ram[6*8192]; slot[7] = &ram[7*8192];
+                    break;
+                case 3:
+                    slot[0] = &ram[8*8192]; slot[1] = &ram[9*8192];
+                    slot[2] = &ram[14*8192]; slot[3] = &ram[15*8192];
+                    slot[4] = &ram[12*8192]; slot[5] = &ram[13*8192];
+                    slot[6] = &ram[6*8192]; slot[7] = &ram[7*8192];
+                    break;
+            }
+        } else {
+            writable[0] = writable[1] = false;
+            for (int i=2;i<8;++i) writable[i] = true;
+            uint8_t hrom = (config_2A_3 & ZX_2A_3_HROM) ? 4 : 0;
+            if (config_128K & ZX_128MEM_ROM) {
+                slot[0] = &rom[(hrom+2)*8192]; slot[1] = &rom[(hrom+3)*8192];
+            } else {            
+                slot[0] = &rom[(hrom+0)*8192]; slot[1] = &rom[(hrom+1)*8192];
+            }
+        }
+    }
 }
diff --git a/zx_system.cpp b/zx_system.cpp
index b880171..d20fe51 100644
--- a/zx_system.cpp
+++ b/zx_system.cpp
@@ -63,6 +63,26 @@ namespace zx_system
                 registerUpdatable(speaker::update);
                 //registerUpdatable(zxscreen::refresh);
 
+                return clock / 10;
+                break;
+            }
+            case ZX_PLUS3:
+            {
+                const uint32_t clock = 3546900;
+                z80::init(clock);
+                z80::connect_port(0xfe, 0x0001, zx_ula::port_in, zx_ula::port_out);
+                mem::init(ZX_PLUS3);
+                zxscreen::init(SCREEN_MODE_128K);
+                audio::init();
+                speaker::init();
+                speaker::register_source(zx_ula::get_sample);
+                speaker::register_source(audio::get_sample);
+
+                registerUpdatable(zx_tape::update);
+                registerUpdatable(audio::update);
+                registerUpdatable(speaker::update);
+                //registerUpdatable(zxscreen::refresh);
+
                 return clock / 10;
                 break;
             }
diff --git a/zx_system.h b/zx_system.h
index 18455e8..638c6f7 100644
--- a/zx_system.h
+++ b/zx_system.h
@@ -4,7 +4,7 @@
 #define ZX_NOCHANGE     0x00
 #define ZX_48K          0x01
 #define ZX_128K         0x02
-#define ZX_2A_3         0x03
+#define ZX_PLUS3        0x03
 #define ZX_NEXT         0x04
 
 namespace zx_system