diff --git a/src/mame/mame.lst b/src/mame/mame.lst
index c6946d00ea0..5198e6ffc28 100755
--- a/src/mame/mame.lst
+++ b/src/mame/mame.lst
@@ -35543,6 +35543,7 @@ streetgr3                       // (c) 1993
 
 @source:pc/pcipc.cpp
 pciagp                          //
+pcimga                          //
 pcinv3                          //
 pcipc                           //
 pcipctx                         //
diff --git a/src/mame/pc/pcipc.cpp b/src/mame/pc/pcipc.cpp
index f72b2b8a77d..8f23fc0b8d5 100644
--- a/src/mame/pc/pcipc.cpp
+++ b/src/mame/pc/pcipc.cpp
@@ -60,6 +60,7 @@ public:
 	void pcipc(machine_config &config);
 	void pcipctx(machine_config &config);
 	void pcinv3(machine_config &config);
+	void pcimga(machine_config &config);
 	void pciagp(machine_config &config);
 
 	pcipc_state(const machine_config &mconfig, device_type type, const char *tag);
@@ -605,6 +606,7 @@ void pcipc_state::pcipctx(machine_config &config)
 	i82371sb_isa_device &isa(I82371SB_ISA(config, "pci:07.0", 0, "maincpu"));
 	isa.boot_state_hook().set(FUNC(pcipc_state::boot_state_award_w));
 //  IDE_PCI(config, "pci:07.1", 0, 0x80867010, 0x03, 0x00000000);
+	// TODO: eventually change this to something else
 	MGA2064W(config, "pci:12.0", 0);
 }
 
@@ -614,6 +616,12 @@ void pcipc_state::pcinv3(machine_config &config)
 	RIVA128(config.replace(), "pci:12.0", 0);
 }
 
+void pcipc_state::pcimga(machine_config &config)
+{
+	pcipc_state::pcipc(config);
+	MGA2064W(config.replace(), "pci:12.0", 0);
+}
+
 void pcipc_state::pciagp(machine_config &config)
 {
 	// TODO: starts at 233'000'000
@@ -695,6 +703,12 @@ ROM_START(pcinv3)
 	ROMX_LOAD("m55-04ns.rom", 0x20000, 0x20000, CRC(0116b2b0) SHA1(19b0203decfd4396695334517488d488aec3ccde), ROM_BIOS(0))
 ROM_END
 
+ROM_START(pcimga)
+	ROM_REGION32_LE(0x40000, "pci:07.0", 0) /* PC bios */
+	ROM_SYSTEM_BIOS(0, "m55ns04", "m55ns04") // Micronics M55HI-Plus with no sound
+	ROMX_LOAD("m55-04ns.rom", 0x20000, 0x20000, CRC(0116b2b0) SHA1(19b0203decfd4396695334517488d488aec3ccde), ROM_BIOS(0))
+ROM_END
+
 ROM_START(pciagp)
 	ROM_REGION32_LE(0x40000, "pci:07.0", 0) /* PC bios */
 	// a.k.a. the BIOS present in savquest.cpp
@@ -708,7 +722,8 @@ INPUT_PORTS_END
 } // anonymous namespace
 
 
-COMP(1998, pcipc,    0,     0, pcipc,   pcipc, pcipc_state, empty_init, "Hack Inc.", "Sandbox PCI PC (430HX)", MACHINE_NO_SOUND)
-COMP(1998, pcinv3,   pcipc, 0, pcinv3,  pcipc, pcipc_state, empty_init, "Hack Inc.", "Sandbox PCI PC (430HX with Riva 128)", MACHINE_NO_SOUND | MACHINE_NOT_WORKING)
-COMP(1998, pcipctx,  0,     0, pcipctx, pcipc, pcipc_state, empty_init, "Hack Inc.", "Sandbox PCI PC (430TX)", MACHINE_NO_SOUND)
-COMP(1999, pciagp,   0,     0, pciagp,  pcipc, pcipc_state, empty_init, "Hack Inc.", "Sandbox PCI/AGP PC (440BX)", MACHINE_NO_SOUND | MACHINE_NOT_WORKING)
+COMP(1998, pcipc,    0,     0, pcipc,   pcipc, pcipc_state, empty_init, "Hack Inc.", "Sandbox PCI PC (430HX)", MACHINE_NO_SOUND )
+COMP(1998, pcinv3,   pcipc, 0, pcinv3,  pcipc, pcipc_state, empty_init, "Hack Inc.", "Sandbox PCI PC (430HX with nVidia Riva 128)", MACHINE_NO_SOUND | MACHINE_NOT_WORKING ) // Windows 98 doesn't recognize video card, may need AGP BIOS instead
+COMP(1998, pcimga,   pcipc, 0, pcimga,  pcipc, pcipc_state, empty_init, "Hack Inc.", "Sandbox PCI PC (430HX with Matrox Millennium)", MACHINE_NO_SOUND | MACHINE_NOT_WORKING ) // cfr. MGA2064W emulation
+COMP(1998, pcipctx,  0,     0, pcipctx, pcipc, pcipc_state, empty_init, "Hack Inc.", "Sandbox PCI PC (430TX)", MACHINE_NO_SOUND | MACHINE_NOT_WORKING) // unemulated super I/O
+COMP(1999, pciagp,   0,     0, pciagp,  pcipc, pcipc_state, empty_init, "Hack Inc.", "Sandbox PCI/AGP PC (440BX)", MACHINE_NO_SOUND | MACHINE_NOT_WORKING) // errors out with ISA state 0x05 (keyboard), does stuff if bypassed but eventually PnP breaks OS booting