From 0d4612d06fb59f343fa9b5a42ed62123ab4a8997 Mon Sep 17 00:00:00 2001 From: AJR Date: Sat, 17 Jun 2017 11:09:39 -0400 Subject: gundealrbl: Change description and document why --- src/mame/drivers/gundealr.cpp | 20 +++++++++++++++++--- 1 file changed, 17 insertions(+), 3 deletions(-) diff --git a/src/mame/drivers/gundealr.cpp b/src/mame/drivers/gundealr.cpp index d8f8efb793d..c7bfc943e2d 100644 --- a/src/mame/drivers/gundealr.cpp +++ b/src/mame/drivers/gundealr.cpp @@ -6,11 +6,21 @@ Gun Dealer memory map driver by Nicola Salmoria -Yam! Yam!? runs on the same hardware but has a protection device which can +The custom graphics chips at locations labeled GA 1, GA 2 and GA 3 (x2) are +surface-scratched on common blue boards. However, a Tecmo-licensed green +PCB reveals them to be none other than NMK-901, NMK-902 and NMK-903. + +Yam! Yam!? runs on similar hardware but has a protection device which can access RAM at e000. Program writes to e000 and expects a value back at e001, then jumps to subroutines at e010 and e020. Also, the player and coin inputs appear magically at e004-e006. +Despite not using GFX customs or MCU protection and lacking Dooyong labels, +gundealrbl might be a factory conversion of Yam! Yam!? rather than a +bootleg, as its board has the same NMK-style markings for the ROM and PROM +locations. In place of the MCU here is a small daughterboard with three +SN74LS245N buffers, a resistor array and an Altera EP320PC. + 0000-7fff ROM 8000-bfff ROM (banked) c400-c7ff palette RAM @@ -514,6 +524,10 @@ static MACHINE_CONFIG_DERIVED( yamyam, gundealr ) MCFG_TIMER_DRIVER_ADD_PERIODIC("mcusim", gundealr_state, yamyam_mcu_sim, attotime::from_hz(6000000/60)) /* 6mhz confirmed */ MACHINE_CONFIG_END +static MACHINE_CONFIG_DERIVED( gundealrbl, yamyam ) + MCFG_DEVICE_REMOVE("mcusim") +MACHINE_CONFIG_END + /*************************************************************************** @@ -569,7 +583,7 @@ ROM_START( gundealrt ) ROM_LOAD( "82s129.7i", 0x0100, 0x0100, NO_DUMP) ROM_END -ROM_START( gundealrbl ) // bootleg with gfx customs done out in TTL logic, different proms, patched code rom +ROM_START( gundealrbl ) // gfx customs done out in TTL logic, different proms, patched code rom ROM_REGION( 0x30000, "maincpu", 0 ) /* 64k for code + 128k for banks */ ROM_LOAD( "29.2.am27c512.f10", 0x00000, 0x10000, CRC(7981751e) SHA1(3138581bcff84a11670ba54cbca608d590055b4e) ) // almost == gundealr "1.3j", 5 bytes different: (what does this change?) ROM_RELOAD( 0x10000, 0x10000 ) /* banked at 0x8000-0xbfff */ @@ -652,7 +666,7 @@ ROM_END GAME( 1990, gundealr, 0, gundealr, gundealr, gundealr_state, 0, ROT270, "Dooyong", "Gun Dealer", MACHINE_SUPPORTS_SAVE ) GAME( 1990, gundealra, gundealr, gundealr, gundealr, gundealr_state, 0, ROT270, "Dooyong", "Gun Dealer (alt card set)", MACHINE_SUPPORTS_SAVE ) GAME( 1990, gundealrt, gundealr, gundealr, gundealt, gundealr_state, 0, ROT270, "Dooyong (Tecmo license)", "Gun Dealer (Japan)", MACHINE_SUPPORTS_SAVE ) -GAME( 1990, gundealrbl, gundealr, yamyam, gundealr, gundealr_state, 0, ROT270, "bootleg", "Gun Dealer (bootleg)", MACHINE_SUPPORTS_SAVE ) +GAME( 1990, gundealrbl, gundealr, gundealrbl, gundealr, gundealr_state, 0, ROT270, "Dooyong", "Gun Dealer (Yam! Yam!? hardware)", MACHINE_SUPPORTS_SAVE ) GAME( 1990, yamyam, 0, yamyam, yamyam, gundealr_state, 0, ROT0, "Dooyong", "Yam! Yam!?", MACHINE_SUPPORTS_SAVE ) GAME( 1990, yamyamk, yamyam, yamyam, yamyam, gundealr_state, 0, ROT0, "Dooyong", "Yam! Yam!? (Korea)", MACHINE_SUPPORTS_SAVE ) -- cgit v1.2.3