diff options
Diffstat (limited to 'src/mame/machine/cchip.cpp')
-rw-r--r-- | src/mame/machine/cchip.cpp | 142 |
1 files changed, 0 insertions, 142 deletions
diff --git a/src/mame/machine/cchip.cpp b/src/mame/machine/cchip.cpp deleted file mode 100644 index 2ab59e3b8ec..00000000000 --- a/src/mame/machine/cchip.cpp +++ /dev/null @@ -1,142 +0,0 @@ -// license:BSD-3-Clause -// copyright-holders:Bryan McPhail, Nicola Salmoria -// thanks-to:Richard Bush -/*************************************************************************** - - cchip.c - -This file contains routines to interface with the Taito Controller Chip -(or "Command Chip") version 1. It's currently used by Superman. -[Further cchip emulation is in machine/rainbow.c, machine/volfied.c, -drivers/opwolf.c and drivers/taito_f2.c] - -According to Richard Bush, the C-Chip is an encrypted Z80 which communicates -with the main board as a protection feature. - - -Superman (revised SJ 060601) --------- - -In Superman, the C-chip's main purpose is to handle player inputs and -coins and pass commands along to the sound chip. - -The 68k queries the c-chip, which passes back $100 bytes of 68k code which -are then executed in RAM. To get around this, we hack in our own code to -communicate with the sound board, since we are familiar with the interface -as it's used in Rastan and Super Space Invaders '91. - -It is believed that the NOPs in the 68k code are there to supply the -necessary cycles to the cchip to switch banks. - -This code requires that the player & coin inputs be in input ports 2-4. - -***************************************************************************/ - -#include "emu.h" -#include "includes/taito_x.h" - -/* This code for sound communication is a hack, it will not be - identical to the code derived from the real c-chip */ - -static const uint8_t superman_code[40] = -{ - 0x48, 0xe7, 0x80, 0x80, /* MOVEM.L D0/A0,-(A7) ( Preserve Regs ) */ - 0x20, 0x6d, 0x1c, 0x40, /* MOVEA.L ($1C40,A5),A0 ( Load sound pointer in A0 ) */ - 0x30, 0x2f, 0x00, 0x0c, /* MOVE.W ($0C,A7),D0 ( Fetch sound number ) */ - 0x10, 0x80, /* MOVE.B D0,(A0) ( Store it on sound pointer ) */ - 0x52, 0x88, /* ADDQ.W #1,A0 ( Increment sound pointer ) */ - 0x20, 0x3c, 0x00, 0xf0, 0x1c, 0x40, /* MOVE.L #$F01C40,D0 ( Load top of buffer in D0 ) */ - 0xb1, 0xc0, /* CMPA.L D0,A0 ( Are we there yet? ) */ - 0x66, 0x04, /* BNE.S *+$6 ( No, we arent, skip next line ) */ - 0x41, 0xed, 0x1c, 0x20, /* LEA ($1C20,A5),A0 ( Point to the start of the buffer ) */ - 0x2b, 0x48, 0x1c, 0x40, /* MOVE.L A0,($1C40,A5) ( Store new sound pointer ) */ - 0x4c, 0xdf, 0x01, 0x01, /* MOVEM.L (A7)+, D0/A0 ( Restore Regs ) */ - 0x4e, 0x75 /* RTS ( Return ) */ -}; - -/************************************* - * - * Writes to C-Chip - Important Bits - * - *************************************/ - -WRITE16_MEMBER( taitox_state::cchip1_ctrl_w ) -{ - /* value 2 is written here */ -} - -WRITE16_MEMBER( taitox_state::cchip1_bank_w ) -{ - m_current_bank = data & 7; -} - -WRITE16_MEMBER( taitox_state::cchip1_ram_w ) -{ - if (m_current_bank == 0 && offset == 0x03) - { - m_cc_port = data; - - space.machine().bookkeeping().coin_lockout_w(1, data & 0x08); - space.machine().bookkeeping().coin_lockout_w(0, data & 0x04); - space.machine().bookkeeping().coin_counter_w(1, data & 0x02); - space.machine().bookkeeping().coin_counter_w(0, data & 0x01); - } - else - { - logerror("cchip1_w pc: %06x bank %02x offset %04x: %02x\n",space.device().safe_pc(),m_current_bank,offset,data); - } -} - - -/************************************* - * - * Reads from C-Chip - * - *************************************/ - -READ16_MEMBER( taitox_state::cchip1_ctrl_r ) -{ - /* - Bit 2 = Error signal - Bit 0 = Ready signal - */ - return 0x01; /* Return 0x05 for C-Chip error */ -} - -READ16_MEMBER( taitox_state::cchip1_ram_r ) -{ - /* Check for input ports */ - if (m_current_bank == 0) - { - switch (offset) - { - case 0x00: return space.machine().root_device().ioport("IN0")->read(); /* Player 1 controls + START1 */ - case 0x01: return space.machine().root_device().ioport("IN1")->read(); /* Player 2 controls + START2 */ - case 0x02: return space.machine().root_device().ioport("IN2")->read(); /* COINn + SERVICE1 + TILT */ - case 0x03: return m_cc_port; - } - } - - /* Other non-standard offsets */ - - if (m_current_bank == 1 && offset <= 0xff) - { - if (offset < 40) /* our hack code is only 40 bytes long */ - return superman_code[offset]; - else /* so pad with zeros */ - return 0; - } - - if (m_current_bank == 2) - { - switch (offset) - { - case 0x000: return 0x47; - case 0x001: return 0x57; - case 0x002: return 0x4b; - } - } - - logerror("cchip1_r bank: %02x offset: %04x\n",m_current_bank,offset); - return 0; -} |