diff --git a/src/devices/cpu/hphybrid/hphybrid.cpp b/src/devices/cpu/hphybrid/hphybrid.cpp
index d1f907edf91..0c03210ea04 100644
--- a/src/devices/cpu/hphybrid/hphybrid.cpp
+++ b/src/devices/cpu/hphybrid/hphybrid.cpp
@@ -1326,8 +1326,8 @@ void hp_hybrid_cpu_device::check_for_interrupts()
 
 	standard_irq_callback(irqline);
 
-	// Get interrupt vector in low byte
-	uint8_t vector = m_int_func();
+	// Get interrupt vector in low byte (level is available on PA3)
+	uint8_t vector = m_int_func(BIT(m_flags , HPHYBRID_IRH_BIT) ? 1 : 0);
 	uint8_t new_PA;
 
 	// Get highest numbered 1
diff --git a/src/mame/drivers/hp64k.cpp b/src/mame/drivers/hp64k.cpp
index bc39b28d579..d4657d50c4c 100644
--- a/src/mame/drivers/hp64k.cpp
+++ b/src/mame/drivers/hp64k.cpp
@@ -192,7 +192,7 @@ private:
 
 	DECLARE_READ16_MEMBER(hp64k_rear_sw_r);
 
-	uint8_t int_cb();
+	uint8_t int_cb(offs_t offset);
 	void hp64k_update_irl(void);
 	DECLARE_WRITE16_MEMBER(hp64k_irl_mask_w);
 
@@ -527,9 +527,13 @@ READ16_MEMBER(hp64k_state::hp64k_rear_sw_r)
 		return m_rear_panel_sw->read() | 0x0020;
 }
 
-uint8_t hp64k_state::int_cb()
+uint8_t hp64k_state::int_cb(offs_t offset)
 {
-		return m_irl_mask & m_irl_pending;
+		if (offset == 0) {
+				return (m_irl_mask & m_irl_pending);
+		} else {
+				return 0xff;
+		}
 }
 
 void hp64k_state::hp64k_update_irl(void)
diff --git a/src/mame/machine/hp98x5_io_sys.cpp b/src/mame/machine/hp98x5_io_sys.cpp
index 3b79786bc50..f403117f172 100644
--- a/src/mame/machine/hp98x5_io_sys.cpp
+++ b/src/mame/machine/hp98x5_io_sys.cpp
@@ -70,9 +70,9 @@ void hp98x5_io_sys_device::device_reset()
 	update_dmar();
 }
 
-uint8_t hp98x5_io_sys_device::int_r()
+uint8_t hp98x5_io_sys_device::int_r(offs_t offset)
 {
-	if ((m_irq_pending & 0xff00) == 0) {
+	if (offset == 0) {
 		return m_irq_pending & 0xff;
 	} else {
 		return m_irq_pending >> 8;
diff --git a/src/mame/machine/hp98x5_io_sys.h b/src/mame/machine/hp98x5_io_sys.h
index 7adeee884cf..e83f6432b24 100644
--- a/src/mame/machine/hp98x5_io_sys.h
+++ b/src/mame/machine/hp98x5_io_sys.h
@@ -29,7 +29,7 @@ public:
 	auto flg() { return m_flg_handler.bind(); }
 	auto dmar() { return m_dmar_handler.bind(); }
 
-	uint8_t int_r();
+	uint8_t int_r(offs_t offset);
 	void pa_w(uint8_t data);
 
 	void set_irq(uint8_t sc , int state);