diff --git a/src/mame/drivers/segas16b.cpp b/src/mame/drivers/segas16b.cpp
index 65f285a8ee2..cac9f523378 100644
--- a/src/mame/drivers/segas16b.cpp
+++ b/src/mame/drivers/segas16b.cpp
@@ -1343,14 +1343,20 @@ void segas16b_state::device_timer(emu_timer &timer, device_timer_id id, int para
 //  from Altered Beast
 //-------------------------------------------------
 
-void segas16b_state::altbeast_common_i8751_sim(offs_t soundoffs, offs_t inputoffs)
+void segas16b_state::altbeast_common_i8751_sim(offs_t soundoffs, offs_t inputoffs, int alt_bank)
 {
 	// signal a VBLANK to the main CPU
 	m_maincpu->set_input_line(4, HOLD_LINE);
 
 	// set tile banks
 	address_space &space = m_maincpu->space(AS_PROGRAM);
-	rom_5704_bank_w(space, 1, m_workram[0x3094/2] & 0x00ff, 0x00ff);
+	int bank = m_workram[0x3094 / 2] & 0x00ff;
+	// alt_bank is used for the alt rom loading (where there are space between the ROMs)
+	// alternatively the rom loading could be changed, but the loading is correct for the non-mcu .b14/.a14 type
+	// board so presumably our MCU simulation should act accordingly.
+	if (alt_bank) bank = (bank & 0x1) | ((bank & 0xfe) << 1);
+
+	rom_5704_bank_w(space, 1, bank, 0x00ff);
 
 	// process any new sound data
 	uint16_t temp = m_workram[soundoffs];
@@ -1366,17 +1372,17 @@ void segas16b_state::altbeast_common_i8751_sim(offs_t soundoffs, offs_t inputoff
 
 void segas16b_state::altbeasj_i8751_sim()
 {
-	altbeast_common_i8751_sim(0x30d4/2, 0x30d0/2);
+	altbeast_common_i8751_sim(0x30d4/2, 0x30d0/2, 1);
 }
 
 void segas16b_state::altbeas5_i8751_sim()
 {
-	altbeast_common_i8751_sim(0x3098/2, 0x3096/2);
+	altbeast_common_i8751_sim(0x3098/2, 0x3096/2, 1);
 }
 
 void segas16b_state::altbeast_i8751_sim()
 {
-	altbeast_common_i8751_sim(0x30c4/2, 0x30c2/2);
+	altbeast_common_i8751_sim(0x30c4/2, 0x30c2/2, 0);
 }
 
 
diff --git a/src/mame/includes/segas16b.h b/src/mame/includes/segas16b.h
index bdc6521c56f..b47037f99fb 100644
--- a/src/mame/includes/segas16b.h
+++ b/src/mame/includes/segas16b.h
@@ -168,7 +168,7 @@ protected:
 	void init_generic(segas16b_rom_board rom_board);
 
 	// i8751 simulations
-	void altbeast_common_i8751_sim(offs_t soundoffs, offs_t inputoffs);
+	void altbeast_common_i8751_sim(offs_t soundoffs, offs_t inputoffs, int alt_bank);
 	void altbeasj_i8751_sim();
 	void altbeas5_i8751_sim();
 	void altbeast_i8751_sim();