diff --git a/src/devices/cpu/psx/psx.cpp b/src/devices/cpu/psx/psx.cpp
index e693cb49eeb..f51a29d5730 100644
--- a/src/devices/cpu/psx/psx.cpp
+++ b/src/devices/cpu/psx/psx.cpp
@@ -1837,6 +1837,10 @@ void psxcpu_device::device_start()
 	save_item( NAME( m_multiplier_operation ) );
 	save_item( NAME( m_multiplier_operand1 ) );
 	save_item( NAME( m_multiplier_operand2 ) );
+	save_item( NAME( m_exp_base ) );
+	save_item( NAME( m_exp_config ) );
+	save_item( NAME( m_ram_config ) );
+	save_item( NAME( m_rom_config ) );
 
 	state_add( STATE_GENPC, "GENPC", m_pc ).noshow();
 	state_add( STATE_GENPCBASE, "CURPC", m_pc ).noshow();
@@ -2023,6 +2027,8 @@ void psxcpu_device::device_post_load()
 	update_memory_handlers();
 	update_address_masks();
 	update_scratchpad();
+	update_ram_config();
+	update_rom_config();
 }