machine/i82371sb.cpp: rectify 377e9d6d7d

src/devices/machine/i82371sb.cpp

@@ -49,6 +49,8 @@ void i82371sb_isa_device::internal_io_map(address_map &map)
 	// Up to $de according to TC430HX spec?
 	map(0x00c0, 0x00df).rw(FUNC(i82371sb_isa_device::at_dma8237_2_r), FUNC(i82371sb_isa_device::at_dma8237_2_w));
 //  map(0x00e0, 0x00ef) MCA bus (cfr. Bochs) or PnP
+	map(0x00ed, 0x00ed).lw8(NAME([] (offs_t offset, u8 data) { }));
+
 //  map(0x00f0, 0x00f0) Reset Numeric Error
 //  map(0x0270, 0x0273) I/O read port for PnP
 	map(0x04d0, 0x04d1).rw(FUNC(i82371sb_isa_device::eisa_irq_read), FUNC(i82371sb_isa_device::eisa_irq_write));

src/devices/machine/mediagx_cs5530_bridge.cpp

@@ -246,6 +246,7 @@ void mediagx_cs5530_bridge_device::internal_io_map(address_map &map)
 	map(0x00c0, 0x00df).rw(FUNC(mediagx_cs5530_bridge_device::at_dma8237_2_r), FUNC(mediagx_cs5530_bridge_device::at_dma8237_2_w));
 //  map(0x04d0, 0x04d1).rw(FUNC(mediagx_cs5530_bridge_device::eisa_irq_read), FUNC(mediagx_cs5530_bridge_device::eisa_irq_write));
 	// map(0x00e0, 0x00ef) MCA bus (cfr. Bochs) or PnP
+	map(0x00ea, 0x00eb).lw8(NAME([] (offs_t offset, u8 data) { }));
 //  map(0x121c, 0x121f) ACPI Timer count register (on rev 1.3+)
 }
 

src/devices/machine/sis85c496.cpp

@@ -55,6 +55,7 @@ void sis85c496_host_device::internal_io_map(address_map &map)
 	map(0x00a0, 0x00a1).rw("pic8259_slave", FUNC(pic8259_device::read), FUNC(pic8259_device::write));
 	map(0x00c0, 0x00df).rw(FUNC(sis85c496_host_device::at_dma8237_2_r), FUNC(sis85c496_host_device::at_dma8237_2_w));
 	// map(0x00e0, 0x00ef) MCA bus (cfr. Bochs) or PnP
+	map(0x00eb, 0x00eb).lw8(NAME([] (offs_t offset, u8 data) { }));
 }
 
 void sis85c496_host_device::device_add_mconfig(machine_config &config)

src/devices/machine/sis950_lpc.cpp

@@ -448,6 +448,7 @@ void sis950_lpc_device::io_map(address_map &map)
 	);
 
 	// map(0x00e0, 0x00ef) MCA bus (cfr. Bochs) or PnP
+	map(0x00eb, 0x00eb).lw8(NAME([] (offs_t offset, u8 data) { }));
 
 	// map(0x00f0, 0x00f0) COPRO error
 	// map(0x0480, 0x048f) DMA high page registers