New clone: D2K Jumpman returns

- emulates Braze Technologies addon board
- eeprom hooked up
- implemented bank switching

I am still unsure about whether this should be added or not.
Interestingly, D2K shows a "(C) 1981 Nintendo" copyright message.
Still, it is actively marketed. 
Putting this up for discussion again.

src/mame/drivers/dkong.c

@@ -7,8 +7,6 @@ TODO:
 - Shooting Gallery: Shootgal.txt mentions speech pcb,
   mikesarcade.com dk conversion - Clarify
 - 8ballact: read 1507 no mapped
-- implement 74LS259 (8bit addressable latches),
-  74LS175 (QUAD D FlipFlop), 74LS373 (Octal transparent latch)
 
 Done:
 - dkong3 dma (Z80 dma)
@@ -296,6 +294,16 @@ Donkey Kong Junior Notes
     2764.5Cp    DJR1-C-5C p    2764   5C(CPU)  F4FE
     ------------------------------------------------
 
+D2K Jumpman returns Notes
+=========================
+
+This is a DKong/Hack combo using a Braze Technologies High Score Save pcb.
+This pcb will be placed in the cpu socket and the Z80 together with an
+additional 64K rom, a 74LS245, an eeprom and a pal/gal. It looks like the
+"encryption" was a conincidence resulting from an easy pcb layout.
+The pal is also used to switch A15 on and off. This is done in locations
+6800 and E800.
+
 ***************************************************************************/
 
 #include "driver.h"
@@ -305,6 +313,8 @@ Donkey Kong Junior Notes
 #include "machine/8257dma.h"
 #include "machine/z80dma.h"
 #include "machine/latch8.h"
+#include "machine/eeprom.h"
+
 
 /*************************************
  *
@@ -487,6 +497,7 @@ static MACHINE_RESET( drakton )
 }
 
 
+
 /*************************************
  *
  *  DMA handling
@@ -750,6 +761,52 @@ static READ8_HANDLER( strtheat_inputport_1_r )
 	}
 }
 
+/*************************************
+ *
+ *  Braze Tech Addon boards
+ *
+ *************************************/
+
+static const eeprom_interface braze_eeprom_intf =
+{
+	7,				/* address bits */
+	8,				/* data bits */
+	"*110",			/* read command */
+	"*101",			/* write command */
+	0,				/* erase command */
+	"*10000xxxxx",	/* lock command */
+	"*10011xxxxx",	/* unlock command */
+};
+
+static READ8_HANDLER( braze_eeprom_r )
+{
+	return eeprom_read_bit();
+}
+
+static WRITE8_HANDLER( braze_a15_w )
+{
+	memory_set_bank(1, data & 0x01);
+	memory_set_bank(2, data & 0x01);
+}
+
+static WRITE8_HANDLER( braze_eeprom_w )
+{
+	eeprom_write_bit(data & 0x01);
+	eeprom_set_cs_line(data & 0x04 ? CLEAR_LINE : ASSERT_LINE);
+	eeprom_set_clock_line(data & 0x02 ? ASSERT_LINE : CLEAR_LINE);
+}
+
+static NVRAM_HANDLER( braze_eeprom )
+{
+	if (read_or_write)
+		eeprom_save(file);
+	else
+	{
+		eeprom_init(&braze_eeprom_intf);
+		if (file)
+			eeprom_load(file);
+	}
+}
 
 /*************************************
  *
@@ -1641,6 +1698,16 @@ static MACHINE_DRIVER_START( dkong2b )
 
 MACHINE_DRIVER_END
 
+
+static MACHINE_DRIVER_START( braze )
+
+	MDRV_IMPORT_FROM(dkong2b)
+
+	MDRV_CPU_MODIFY("main")
+	MDRV_NVRAM_HANDLER(braze_eeprom)
+
+MACHINE_DRIVER_END
+
 static MACHINE_DRIVER_START( dkong3 )
 
 	/* driver data */
@@ -2814,6 +2881,40 @@ ROM_START( shootgal )
 	ROM_LOAD( "82s147.prm",  0x0000, 0x0200, BAD_DUMP CRC(46e5bc92) SHA1(f4171f8650818c017d58ad7131a7aff100b1b99c) )	/* no dump - taken from hunchbkd */
 ROM_END
 
+ROM_START( dkongx )
+	ROM_REGION( 0x10000, "main", 0 )
+	ROM_LOAD( "c_5et_g.bin",  0x0000, 0x1000, CRC(ba70b88b) SHA1(d76ebecfea1af098d843ee7e578e480cd658ac1a) )
+	ROM_LOAD( "c_5ct_g.bin",  0x1000, 0x1000, CRC(5ec461ec) SHA1(acb11a8fbdbb3ab46068385fe465f681e3c824bd) )
+	ROM_LOAD( "c_5bt_g.bin",  0x2000, 0x1000, CRC(1c97d324) SHA1(c7966261f3a1d3296927e0b6ee1c58039fc53c1f) )
+	ROM_LOAD( "c_5at_g.bin",  0x3000, 0x1000, CRC(b9005ac0) SHA1(3fe3599f6fa7c496f782053ddf7bacb453d197c4) )
+	/* space for diagnostic ROM */
+
+	ROM_REGION( 0x10000, "braze", 0 )
+	ROM_LOAD( "27512.bin",  0x0000, 0x10000, CRC(6e95ca0d) )
+	//ROM_LOAD( "27512.bin",  0x4000, 0xc000, CRC(6e95ca0d) )
+	//ROM_CONTINUE(0x0000,0x4000)
+  
+	ROM_REGION( 0x1800, "sound", 0 )	/* sound */
+	ROM_LOAD( "s_3i_b.bin",   0x0000, 0x0800, CRC(45a4ed06) SHA1(144d24464c1f9f01894eb12f846952290e6e32ef) )
+	ROM_RELOAD(               0x0800, 0x0800 )
+	ROM_LOAD( "s_3j_b.bin",   0x1000, 0x0800, CRC(4743fe92) SHA1(6c82b57637c0212a580591397e6a5a1718f19fd2) )
+
+	ROM_REGION( 0x1000, "gfx1", ROMREGION_DISPOSE )
+	ROM_LOAD( "v_5h_b.bin",   0x0000, 0x0800, CRC(12c8c95d) SHA1(a57ff5a231c45252a63b354137c920a1379b70a3) )
+	ROM_LOAD( "v_3pt.bin",    0x0800, 0x0800, CRC(15e9c5e9) SHA1(976eb1e18c74018193a35aa86cff482ebfc5cc4e) )
+
+	ROM_REGION( 0x2000, "gfx2", ROMREGION_DISPOSE )
+	ROM_LOAD( "l_4m_b.bin",   0x0000, 0x0800, CRC(59f8054d) SHA1(793dba9bf5a5fe76328acdfb90815c243d2a65f1) )
+	ROM_LOAD( "l_4n_b.bin",   0x0800, 0x0800, CRC(672e4714) SHA1(92e5d379f4838ac1fa44d448ce7d142dae42102f) )
+	ROM_LOAD( "l_4r_b.bin",   0x1000, 0x0800, CRC(feaa59ee) SHA1(ecf95db5a20098804fc8bd59232c66e2e0ed3db4) )
+	ROM_LOAD( "l_4s_b.bin",   0x1800, 0x0800, CRC(20f2ef7e) SHA1(3bc482a38bf579033f50082748ee95205b0f673d) )
+
+	ROM_REGION( 0x0300, "proms", 0 )
+	ROM_LOAD( "c-2k.bpr",     0x0000, 0x0100, CRC(e273ede5) SHA1(b50ec9e1837c00c20fb2a4369ec7dd0358321127) ) /* palette low 4 bits (inverted) */
+	ROM_LOAD( "c-2j.bpr",     0x0100, 0x0100, CRC(d6412358) SHA1(f9c872da2fe8e800574ae3bf483fb3ccacc92eb3) ) /* palette high 4 bits (inverted) */
+	ROM_LOAD( "v-5e.bpr",     0x0200, 0x0100, CRC(b869b8f5) SHA1(c2bdccbf2654b64ea55cd589fd21323a9178a660) ) /* character color codes on a per-column basis */
+ROM_END
+
 /*************************************
  *
  *  Decryption code
@@ -2843,6 +2944,26 @@ static void drakton_decrypt_rom(running_machine *machine, UINT8 mod, int offs, i
 	}
 }
 
+static void braze_decrypt_rom(running_machine *machine, UINT8 *dest)
+{
+	UINT8 oldbyte,newbyte;
+	UINT8 *ROM;
+	UINT32 mem;
+	UINT32 newmem;
+
+	ROM = memory_region(machine, "braze");
+
+	for (mem=0;mem<0x10000;mem++)
+	{
+		oldbyte = ROM[mem];
+
+		newmem = ((BITSWAP8((mem >> 8),7,2,3,1,0,6,4,5))<<8) | (mem & 0xff);
+		newbyte = BITSWAP8(oldbyte, 1,4,5,7,6,0,3,2);
+
+		dest[newmem] = newbyte;
+	}
+}
+
 /*************************************
  *
  *  Driver Init Code
@@ -2914,6 +3035,28 @@ static DRIVER_INIT( strtheat )
 	memory_install_read8_handler(machine, 0, ADDRESS_SPACE_PROGRAM, 0x7c80, 0x7c80, 0, 0, strtheat_inputport_1_r);
 }
 
+static DRIVER_INIT( dkongx )
+{
+	UINT8 *decrypted;
+
+	decrypted = auto_malloc(0x10000);
+	
+	memory_install_read8_handler(machine, 0, ADDRESS_SPACE_PROGRAM, 0x0000, 0x5fff, 0, 0, SMH_BANK1 );
+	memory_install_read8_handler(machine, 0, ADDRESS_SPACE_PROGRAM, 0x8000, 0xffff, 0, 0, SMH_BANK2 );
+
+	memory_install_write8_handler(machine, 0, ADDRESS_SPACE_PROGRAM, 0xE000, 0xE000, 0, 0, braze_a15_w );
+
+	memory_install_read8_handler(machine, 0, ADDRESS_SPACE_PROGRAM, 0xC800, 0xC800, 0, 0, braze_eeprom_r );
+	memory_install_write8_handler(machine, 0, ADDRESS_SPACE_PROGRAM, 0xC800, 0xC800, 0, 0, braze_eeprom_w );
+
+	braze_decrypt_rom(machine, decrypted);
+
+	memory_configure_bank(1, 0, 2, &decrypted[0], 0x8000);
+	memory_set_bank(1, 0);
+	memory_configure_bank(2, 0, 2, &decrypted[0], 0x8000);
+	memory_set_bank(2, 0);
+}
+
 /*************************************
  *
  *  Game drivers
@@ -2958,3 +3101,6 @@ GAME( 1985, spcfrcii, 0,		spclforc, spclforc,       0,  ROT90, "Senko Industries
 GAME( 1984, drakton,  0,        drakton,  drakton,  drakton,  ROT90, "Epos Corporation", "Drakton (DK conversion)", GAME_SUPPORTS_SAVE )
 GAME( 1984, drktnjr,  drakton,  drktnjr,  drakton,  drakton,  ROT90, "Epos Corporation", "Drakton (DKJr conversion)", GAME_SUPPORTS_SAVE )
 GAME( 1985, strtheat, 0,        strtheat, strtheat, strtheat, ROT90, "Epos Corporation", "Street Heat - Cardinal Amusements", GAME_SUPPORTS_SAVE )
+
+/* Hacks */
+GAME( 200?, dkongx,   dkong,    braze,   dkong,    dkongx,    ROT90, "Jeff's Romhack", "D2K Jumpman returns (Hack)", GAME_SUPPORTS_SAVE )

src/mame/mamedriv.c

@@ -968,6 +968,7 @@ const game_driver * const drivers[] =
 	DRIVER( herbiedk )	/* (c) 1984 CVS */
 	DRIVER( herodk )	/* (c) 1984 Seatongrove + Crown license */
 	DRIVER( herodku )	/* (c) 1984 Seatongrove + Crown license */
+	DRIVER( dkongx )	/* 200? Jeff's Romhack */
 	DRIVER( skyskipr )	/* (c) 1981 */
 	DRIVER( popeye )	/* (c) 1982 */
 	DRIVER( popeyeu )	/* (c) 1982 */