bus/isa/svga_paradise.cpp: (try to) pull cnf15 high for wd90c11

Author: angelosa

src/devices/bus/isa/svga_paradise.cpp

@@ -342,11 +342,14 @@ void isa16_wd90c11_lr_device::device_add_mconfig(machine_config &config)
 	m_vga->set_screen("screen");
 	// 512KB (+ option for 1MB? Verify with interlace)
 	m_vga->set_vram_size(0x100000);
+	// required by megapc and teradrive for color
+	m_vga->read_cnf15_callback().set_constant(1);
 }
 
 void isa16_wd90c11_lr_device::io_isa_map(address_map &map)
 {
-	map(0x00, 0x2f).m(m_vga, FUNC(wd90c11a_vga_device::io_map));
+	map(0x03b0, 0x03df).m(m_vga, FUNC(wd90c11a_vga_device::io_map));
+	map(0x46e8, 0x46e8).w(m_vga, FUNC(wd90c11a_vga_device::mode_setup_w));
 }
 
 void isa16_wd90c11_lr_device::device_start()
@@ -356,7 +359,7 @@ void isa16_wd90c11_lr_device::device_start()
 	m_isa->install_rom(this, 0xc0000, 0xc7fff, "vga_rom");
 
 	m_isa->install_memory(0xa0000, 0xbffff, read8sm_delegate(*m_vga, FUNC(wd90c11a_vga_device::mem_r)), write8sm_delegate(*m_vga, FUNC(wd90c11a_vga_device::mem_w)));
-	m_isa->install_device(0x03b0, 0x03df, *this, &isa16_wd90c11_lr_device::io_isa_map);
+	m_isa->install_device(0x0000, 0xffff, *this, &isa16_wd90c11_lr_device::io_isa_map);
 }
 
 /******************

src/mame/pc/teradrive.cpp

@@ -1,5 +1,5 @@
 // license:BSD-3-Clause
-// copyright-holders:
+// copyright-holders: Angelo Salese
 /**************************************************************************************************
 
 Sega Teradrive
@@ -24,7 +24,7 @@ NOTES (MD side):
 
 TODO:
 - Many unknown ports;
-- IBM 79F2661 ISA bus switch, motherboard resource also shared with undumped 5510Z Japanese DOS/V);
+- Pulls VGA EGASW low (PR11) after setup mode, causing mono colors (shared issue with megapc);
 - "TIMER FAIL" when exiting from setup menu;
 - MD side, as a testbed for rewriting base HW;
 
@@ -47,6 +47,8 @@ NOTES (MD side):
 /*
  * ISA16 IBM 79F2661 "bus switch"
  *
+ * Motherboard resource also shared with undumped 5510Z Japanese DOS/V
+ *
  */
 
 class isa16_ibm_79f2661 : public device_t, public device_isa16_card_interface