diff options
Diffstat (limited to 'src/mess/machine/z88_ram.c')
-rw-r--r-- | src/mess/machine/z88_ram.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/src/mess/machine/z88_ram.c b/src/mess/machine/z88_ram.c new file mode 100644 index 00000000000..e531b7097a1 --- /dev/null +++ b/src/mess/machine/z88_ram.c @@ -0,0 +1,108 @@ +/*************************************************************************** + + z88_ram.c + + Z88 RAM cartridges emulation + +***************************************************************************/ + +#include "emu.h" +#include "z88_ram.h" + +/*************************************************************************** + IMPLEMENTATION +***************************************************************************/ + +//************************************************************************** +// GLOBAL VARIABLES +//************************************************************************** + +const device_type Z88_32K_RAM = &device_creator<z88_32k_ram_device>; +const device_type Z88_128K_RAM = &device_creator<z88_128k_ram_device>; +const device_type Z88_512K_RAM = &device_creator<z88_512k_ram_device>; +const device_type Z88_1024K_RAM = &device_creator<z88_1024k_ram_device>; + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// z88_32k_ram_device - constructor +//------------------------------------------------- + +z88_32k_ram_device::z88_32k_ram_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : device_t(mconfig, Z88_32K_RAM, "Z88 32KB RAM", tag, owner, clock), + device_z88cart_interface( mconfig, *this ) +{ +} + +z88_32k_ram_device::z88_32k_ram_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock) + : device_t(mconfig, type, name, tag, owner, clock), + device_z88cart_interface( mconfig, *this ) +{ +} + +//------------------------------------------------- +// z88_128k_ram_device - constructor +//------------------------------------------------- + +z88_128k_ram_device::z88_128k_ram_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : z88_32k_ram_device(mconfig, Z88_128K_RAM, "Z88 128KB RAM", tag, owner, clock) +{ +} + +//------------------------------------------------- +// z88_512k_ram_device - constructor +//------------------------------------------------- + +z88_512k_ram_device::z88_512k_ram_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : z88_32k_ram_device(mconfig, Z88_512K_RAM, "Z88 512KB RAM", tag, owner, clock) +{ +} + +//------------------------------------------------- +// z88_1024k_ram_device - constructor +//------------------------------------------------- + +z88_1024k_ram_device::z88_1024k_ram_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : z88_32k_ram_device(mconfig, Z88_1024K_RAM, "Z88 1024KB RAM", tag, owner, clock) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void z88_32k_ram_device::device_start() +{ + m_ram = machine().memory().region_alloc(tag(), get_cart_size(), 1, ENDIANNESS_LITTLE)->base(); + memset(m_ram, 0, get_cart_size()); +} + +/*------------------------------------------------- + get_cart_base +-------------------------------------------------*/ + +UINT8* z88_32k_ram_device::get_cart_base() +{ + return m_ram; +} + +/*------------------------------------------------- + read +-------------------------------------------------*/ + +READ8_MEMBER(z88_32k_ram_device::read) +{ + return m_ram[offset & (get_cart_size() - 1)]; +} + +/*------------------------------------------------- + write +-------------------------------------------------*/ + +WRITE8_MEMBER(z88_32k_ram_device::write) +{ + m_ram[offset & (get_cart_size() - 1)] = data; +} |