BFM_Cobra3 - attempt to improve non-MPEG hardware parts. (#14588)

* New systems marked not working
------------------------------
Telly Addicts (New Series) (Bellfruit) (Cobra 3) [James Wallace, blueonesarefaster]

Author: james-wallace-ghub

src/devices/machine/68340.cpp

@@ -130,8 +130,16 @@ uint8_t m68340_cpu_device::int_ack(offs_t offset)
 uint16_t m68340_cpu_device::m68340_internal_base_r(offs_t offset, uint16_t mem_mask)
 {
 	if (!machine().side_effects_disabled())
-		LOGMASKED(LOG_BASE, "%08x m68340_internal_base_r %08x, (%08x)\n", m_ppc, offset*2,mem_mask);
-	return ((!BIT(offset, 0) ? (m_m68340_base >> 16): m_m68340_base)) & 0xffff;
+		LOGMASKED(LOG_BASE, "%08x m68340_internal_base_r %08x, (%08x) (%08x)\n", m_ppc, offset*2,mem_mask, m_sfc);
+
+	if (m_sfc==0x7)
+	{
+		return ((!BIT(offset, 0) ? (m_m68340_base >> 16): m_m68340_base)) & 0xffff;
+	}
+	else
+	{
+		return m_internal->unmap();
+	}
 }
 
 void m68340_cpu_device::m68340_internal_base_w(offs_t offset, uint16_t data, uint16_t mem_mask)
@@ -269,6 +277,7 @@ void m68340_cpu_device::device_start()
 	m_m68340_base = 0x00000000;
 
 	m_internal = &space(AS_PROGRAM);
+	m_internal->unmap_value_high();
 }