diff options
Diffstat (limited to 'src/devices/bus/sdk85/i8755.cpp')
-rw-r--r-- | src/devices/bus/sdk85/i8755.cpp | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/src/devices/bus/sdk85/i8755.cpp b/src/devices/bus/sdk85/i8755.cpp new file mode 100644 index 00000000000..8c1d7a79fbf --- /dev/null +++ b/src/devices/bus/sdk85/i8755.cpp @@ -0,0 +1,65 @@ +// license:BSD-3-Clause +// copyright-holders:AJR + +#include "emu.h" +#include "i8755.h" + +// device type definition +DEFINE_DEVICE_TYPE(SDK85_I8755, sdk85exp_i8755_device, "sdk85exp_i8755", "SDK-85 PROM I/O Expansion (Intel 8755)") + +sdk85exp_i8755_device::sdk85exp_i8755_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) + : device_t(mconfig, SDK85_I8755, tag, owner, clock) + , device_sdk85_romexp_card_interface(mconfig, *this) + , m_i8755(*this, "i8755") +{ +} + +void sdk85exp_i8755_device::device_start() +{ +} + +u8 sdk85exp_i8755_device::read_memory(offs_t offset) +{ + return m_i8755->memory_r(offset); +} + +void sdk85exp_i8755_device::write_memory(offs_t offset, u8 data) +{ + logerror("Writing %02Xh to base + %03Xh\n", data, offset); + m_i8755->io_w(offset & 3, data); +} + +u8 sdk85exp_i8755_device::read_io(offs_t offset) +{ + return m_i8755->io_r(offset & 3); +} + +void sdk85exp_i8755_device::write_io(offs_t offset, u8 data) +{ + m_i8755->io_w(offset & 3, data); +} + +void sdk85exp_i8755_device::device_add_mconfig(machine_config &config) +{ + I8355(config, m_i8755, DERIVED_CLOCK(1, 1)); +} + +u8 *sdk85exp_i8755_device::get_rom_base(u32 size) +{ + if (size != 0x800) + { + osd_printf_error("sdk85exp_i8755: Data length must be 2,048 bytes\n"); + return nullptr; + } + + return memregion("i8755")->base(); +} + +ROM_START(sdk85exp_i8755) + ROM_REGION(0x800, "i8755", ROMREGION_ERASE00) +ROM_END + +const tiny_rom_entry *sdk85exp_i8755_device::device_rom_region() const +{ + return ROM_NAME(sdk85exp_i8755); +} |