diff --git a/src/mame/drivers/mosaic.cpp b/src/mame/drivers/mosaic.cpp
index fddb52cf413..0d19e9b9f29 100644
--- a/src/mame/drivers/mosaic.cpp
+++ b/src/mame/drivers/mosaic.cpp
@@ -35,13 +35,14 @@ Actual Measured Clocks     Derived
      Z180 - 6.14522MHz  (12.288000MHz/2)
   YM2203C - 3.57543MHz  (14.318181MHz/4)
 
-Unknown 28 pin protection chip (possibly a PIC) at 5A (UC02 as silkscreened on PCB)
+Unknown 28 pin protection chip (PIC, probably PIC16C55) at 5A (UC02 as silkscreened on PCB)
 
 ***************************************************************************/
 
 #include "emu.h"
 #include "includes/mosaic.h"
 
+#include "cpu/pic16c5x/pic16c5x.h"
 #include "cpu/z180/z180.h"
 #include "sound/2203intf.h"
 #include "emupal.h"
@@ -49,7 +50,7 @@ Unknown 28 pin protection chip (possibly a PIC) at 5A (UC02 as silkscreened on P
 #include "speaker.h"
 
 
-WRITE8_MEMBER(mosaic_state::protection_w)
+WRITE8_MEMBER(mosaic_state::protection_w) // TODO: hook up PIC dump and remove this simulation (PIC dump contains the exact values in this jumptable)
 {
 	if (!BIT(data, 7))
 	{
@@ -245,7 +246,7 @@ static INPUT_PORTS_START( gfire2 )
 	PORT_DIPSETTING(    0x0c, DEF_STR( Easy ) )
 	PORT_DIPSETTING(    0x08, DEF_STR( Normal ) )
 	PORT_DIPSETTING(    0x04, DEF_STR( Hard ) )
-//  PORT_DIPSETTING(    0x00, DEF_STR( Hard ) )
+	PORT_DIPSETTING(    0x00, DEF_STR( Hard ) )
 	PORT_DIPNAME( 0x02, 0x02, "Bonus Time" )
 	PORT_DIPSETTING(    0x00, "*2 +30" )
 	PORT_DIPSETTING(    0x02, "*2 +50" )
@@ -289,6 +290,13 @@ void mosaic_state::mosaic(machine_config &config)
 	m_maincpu->set_addrmap(AS_IO, &mosaic_state::mosaic_io_map);
 	m_maincpu->set_vblank_int("screen", FUNC(mosaic_state::irq0_line_hold));
 
+	PIC16C55(config, "pic", 12288000/3);  // not confirmed
+	//read_a().set(FUNC(mosaic_state::));
+	//write_a().set(FUNC(mosaic_state::));
+	//read_b().set(FUNC(mosaic_state::));
+	//write_b().set(FUNC(mosaic_state::));
+	//read_c().set(FUNC(mosaic_state::));
+	//write_c().set(FUNC(mosaic_state::));
 
 	/* video hardware */
 	screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
@@ -317,6 +325,8 @@ void mosaic_state::gfire2(machine_config &config)
 
 	m_maincpu->set_addrmap(AS_PROGRAM, &mosaic_state::gfire2_map);
 	m_maincpu->set_addrmap(AS_IO, &mosaic_state::gfire2_io_map);
+
+	subdevice<pic16c55_device>("pic")->set_disable(); // no PIC decap yet
 }
 
 
@@ -331,6 +341,9 @@ ROM_START( mosaic )
 	ROM_REGION( 0x100000, "maincpu", 0 )    /* 1024k for Z180 address space */
 	ROM_LOAD( "9.ua02", 0x00000, 0x10000, CRC(5794dd39) SHA1(28784371f4ca561e3c0fb74d1f0a204f58ccdd3a) ) /* at PCB location 7F */
 
+	ROM_REGION( 0x400, "pic", 0 )
+	ROM_LOAD( "pic16c55.uc02",    0x000, 0x400, CRC(62d1d85d) SHA1(167e1f39e85f0bbecc4374f3975aa0c41173f070) ) // decapped, presumed to be 16C55
+
 	ROM_REGION( 0x40000, "gfx1", 0 )
 	ROM_LOAD( "1.u505", 0x00000, 0x10000, CRC(05f4cc70) SHA1(367cfa716b5d24663efcd98a4a80bf02ef28f2f8) ) /* at PCB location 1L */
 	ROM_LOAD( "2.u506", 0x10000, 0x10000, CRC(78907875) SHA1(073b90e0303f7812e7e8f66bb798a7734cb36bb9) ) /* at PCB location 1K */
@@ -348,6 +361,9 @@ ROM_START( mosaica )
 	ROM_REGION( 0x100000, "maincpu", 0 )    /* 1024k for Z180 address space */
 	ROM_LOAD( "mosaic_9.a02", 0x00000, 0x10000, CRC(ecb4f8aa) SHA1(e45c074bac92d1d079cf1bcc0a6a081beb3dbb8e) ) /* at PCB location 7F */
 
+	ROM_REGION( 0x400, "pic", 0 )
+	ROM_LOAD( "pic16c55.uc02",    0x000, 0x400, CRC(62d1d85d) SHA1(167e1f39e85f0bbecc4374f3975aa0c41173f070) ) // decapped, presumed to be 16C55
+
 	ROM_REGION( 0x40000, "gfx1", 0 )
 	ROM_LOAD( "1.u505", 0x00000, 0x10000, CRC(05f4cc70) SHA1(367cfa716b5d24663efcd98a4a80bf02ef28f2f8) ) /* at PCB location 1L */
 	ROM_LOAD( "2.u506", 0x10000, 0x10000, CRC(78907875) SHA1(073b90e0303f7812e7e8f66bb798a7734cb36bb9) ) /* at PCB location 1K */
@@ -365,6 +381,9 @@ ROM_START( gfire2 )
 	ROM_REGION( 0x100000, "maincpu", 0 )    /* 1024k for Z180 address space */
 	ROM_LOAD( "goldf2_i.7e",         0x00000, 0x10000, CRC(a102f7d0) SHA1(cfde51d0e9e69e9653fdfd70d4e4f4649b662005) )
 
+	ROM_REGION( 0x400, "pic", 0 )
+	ROM_LOAD( "pic16c55.uc02",    0x000, 0x400, NO_DUMP ) // same sanded off chip as mosaic, verified on PCB pic
+
 	ROM_REGION( 0x100000, "gfx1", 0 )
 	ROM_LOAD( "goldf2_a.1k",         0x00000, 0x40000, CRC(1f086472) SHA1(c776a734869b6bab317627bd15457a9fb18e1159) )
 	ROM_LOAD( "goldf2_b.1j",         0x40000, 0x40000, CRC(edb0d40c) SHA1(624a71b42a2e6c7c55cf455395aa0ad9b3eaeb9e) )