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author | 2013-10-20 17:49:46 +0000 | |
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committer | 2013-10-20 17:49:46 +0000 | |
commit | 1359d642c9656987b6d988e8aafb628841fcc97f (patch) | |
tree | 80aba2eeaa4d3b1687ad54d5e83d225e5b32ed7f /src/emu/bus/c64/multiscreen.c | |
parent | 9cd179295e4783237b05a0c1369b46254da7c04a (diff) |
(MESS) c64: Moved expansion and user ports under emu/bus. (nw)
Diffstat (limited to 'src/emu/bus/c64/multiscreen.c')
-rw-r--r-- | src/emu/bus/c64/multiscreen.c | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/src/emu/bus/c64/multiscreen.c b/src/emu/bus/c64/multiscreen.c new file mode 100644 index 00000000000..bc3010b9403 --- /dev/null +++ b/src/emu/bus/c64/multiscreen.c @@ -0,0 +1,271 @@ +// license:BSD-3-Clause +// copyright-holders:Curt Coder +/********************************************************************** + + Multiscreen cartridge emulation + + Copyright MESS Team. + Visit http://mamedev.org for licensing and usage restrictions. + +**********************************************************************/ + +/* + + PCB Layout + ---------- + + |===================| + | ROM6 | + | MC14066 | + | | + |===============| ROM5 | + |=| | + |=| | + |=| RAM BAT ROM4 | + |=| | + |=| | + |=| ROM0 ROM3 | + |=| | + |=| | + |===============| LS138 ROM2 | + | LS138 | + | LS174 | + | LS133 ROM1 | + |===================| + + BAT - BR2325 lithium battery + RAM - ? 8Kx8 RAM + ROM0 - ? 16Kx8 EPROM + ROM1 - ? 32Kx8 EPROM + ROM2 - ? 32Kx8 EPROM + ROM3 - ? 32Kx8 EPROM + ROM4 - not populated + ROM5 - not populated + ROM6 - not populated + +*/ + +/* + + TODO: + + - M6802 board + - crashes on boot + + 805A: lda $01 + 805C: and #$FE + 805E: sta $01 + 8060: m6502_brk#$00 <-- BOOM! + +*/ + +#include "multiscreen.h" + + + +//************************************************************************** +// MACROS/CONSTANTS +//************************************************************************** + +#define MC6802P_TAG "m6802" +#define MC6821P_0_TAG "m6821_0" +#define MC6821P_1_TAG "m6821_1" + + +#define BANK_RAM 0x0d + + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type C64_MULTISCREEN = &device_creator<c64_multiscreen_cartridge_device>; + + +//------------------------------------------------- +// ROM( c64_multiscreen ) +//------------------------------------------------- + +ROM_START( c64_multiscreen ) + ROM_REGION( 0x2000, MC6802P_TAG, 0 ) + ROM_LOAD( "1", 0x0000, 0x1000, CRC(35be02a8) SHA1(5912bc3d8e0c0949c1e66c19116d6b71c7574e46) ) + ROM_LOAD( "2 cr", 0x1000, 0x1000, CRC(76a9ac6d) SHA1(87e7335e626bdb73498b46c28c7baab72df38d1f) ) +ROM_END + + +//------------------------------------------------- +// rom_region - device-specific ROM region +//------------------------------------------------- + +const rom_entry *c64_multiscreen_cartridge_device::device_rom_region() const +{ + return ROM_NAME( c64_multiscreen ); +} + + +static ADDRESS_MAP_START( multiscreen_mem, AS_PROGRAM, 8, c64_multiscreen_cartridge_device ) + AM_RANGE(0x0000, 0x1fff) AM_ROM AM_REGION(MC6802P_TAG, 0) +ADDRESS_MAP_END + + +//------------------------------------------------- +// pia6821_interface pia0_intf - +//------------------------------------------------- + +static const pia6821_interface pia0_intf = +{ + DEVCB_NULL, // input A + DEVCB_NULL, // input B + DEVCB_NULL, // input CA1 + DEVCB_NULL, // input CB1 + DEVCB_NULL, // input CA2 + DEVCB_NULL, // input CB2 + DEVCB_NULL, // output A + DEVCB_NULL, // output B + DEVCB_NULL, // output CA2 + DEVCB_NULL, // output CB2 + DEVCB_NULL, // irq A + DEVCB_NULL // irq B +}; + + +//------------------------------------------------- +// pia6821_interface pia1_intf - +//------------------------------------------------- + +static const pia6821_interface pia1_intf = +{ + DEVCB_NULL, // input A + DEVCB_NULL, // input B + DEVCB_NULL, // input CA1 + DEVCB_NULL, // input CB1 + DEVCB_NULL, // input CA2 + DEVCB_NULL, // input CB2 + DEVCB_NULL, // output A + DEVCB_NULL, // output B + DEVCB_NULL, // output CA2 + DEVCB_NULL, // output CB2 + DEVCB_NULL, // irq A + DEVCB_NULL // irq B +}; + + +//------------------------------------------------- +// MACHINE_CONFIG_FRAGMENT( c64_multiscreen ) +//------------------------------------------------- + +static MACHINE_CONFIG_FRAGMENT( c64_multiscreen ) + MCFG_CPU_ADD(MC6802P_TAG, M6802, XTAL_4MHz) + MCFG_CPU_PROGRAM_MAP(multiscreen_mem) + + MCFG_PIA6821_ADD(MC6821P_0_TAG, pia0_intf) + MCFG_PIA6821_ADD(MC6821P_1_TAG, pia1_intf) +MACHINE_CONFIG_END + + +//------------------------------------------------- +// machine_config_additions - device-specific +// machine configurations +//------------------------------------------------- + +machine_config_constructor c64_multiscreen_cartridge_device::device_mconfig_additions() const +{ + return MACHINE_CONFIG_NAME( c64_multiscreen ); +} + + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// c64_multiscreen_cartridge_device - constructor +//------------------------------------------------- + +c64_multiscreen_cartridge_device::c64_multiscreen_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, C64_MULTISCREEN, "C64 Multiscreen cartridge", tag, owner, clock, "c64_mscr", __FILE__), + device_c64_expansion_card_interface(mconfig, *this) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void c64_multiscreen_cartridge_device::device_start() +{ + // state saving + save_item(NAME(m_bank)); +} + + +//------------------------------------------------- +// device_reset - device-specific reset +//------------------------------------------------- + +void c64_multiscreen_cartridge_device::device_reset() +{ + m_bank = 0; +} + + +//------------------------------------------------- +// c64_cd_r - cartridge data read +//------------------------------------------------- + +UINT8 c64_multiscreen_cartridge_device::c64_cd_r(address_space &space, offs_t offset, UINT8 data, int sphi2, int ba, int roml, int romh, int io1, int io2) +{ + if (!roml) + { + int bank = m_bank & 0x0f; + + if (bank == BANK_RAM) + { + data = m_nvram[offset & 0x1fff]; + } + else + { + data = m_roml[(bank << 14) | (offset & 0x3fff)]; + } + } + else if (!romh) + { + int bank = m_bank & 0x0f; + + if (bank == BANK_RAM) + { + data = m_roml[offset & 0x3fff]; + } + else + { + data = m_roml[(bank << 14) | (offset & 0x3fff)]; + } + } + + return data; +} + + +//------------------------------------------------- +// c64_cd_w - cartridge data write +//------------------------------------------------- + +void c64_multiscreen_cartridge_device::c64_cd_w(address_space &space, offs_t offset, UINT8 data, int sphi2, int ba, int roml, int romh, int io1, int io2) +{ + if (offset >= 0x8000 && offset < 0xa000) + { + int bank = m_bank & 0x0f; + + if (bank == BANK_RAM) + { + m_nvram[offset & 0x1fff] = data; + } + } + else if (!io2) + { + m_bank = data; + } +} |