diff options
Diffstat (limited to 'src/mame/tvgames/xavix_io.cpp')
-rw-r--r-- | src/mame/tvgames/xavix_io.cpp | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/src/mame/tvgames/xavix_io.cpp b/src/mame/tvgames/xavix_io.cpp new file mode 100644 index 00000000000..25046211735 --- /dev/null +++ b/src/mame/tvgames/xavix_io.cpp @@ -0,0 +1,97 @@ +// license:BSD-3-Clause +// copyright-holders:David Haywood + +// TODO: hook this back up, and work out why taikodp eeprom breaks when it is hooked up. epo_efdx breakage is expected because that requires an ugly hack to get to the title +// note, eeproms don't work properly in most games at the moment, but no behavioral change was expected with taikodp + +#include "emu.h" +#include "xavix_io.h" + +#define VERBOSE 0 +#include "logmacro.h" + +DEFINE_DEVICE_TYPE(XAVIXIO, xavix_io_device, "xavixio", "XaviX IO") + +xavix_io_device::xavix_io_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) + : device_t(mconfig, XAVIXIO, tag, owner, clock) + , m_in0_cb(*this, 0xff) + , m_in1_cb(*this, 0xff) + , m_out0_cb(*this) + , m_out1_cb(*this) +{ +} + +void xavix_io_device::device_start() +{ + save_item(NAME(m_dir)); + save_item(NAME(m_dat)); +} + +void xavix_io_device::device_reset() +{ + for (int i = 0; i < 2; i++) + { + m_dir[i] = 0; + m_dat[i] = 0; + } +} + +// direction: 1 is out, 0 is in + +void xavix_io_device::xav_7a0x_dir_w(offs_t offset, uint8_t data) +{ + LOG("%s: xavix IO xav_7a0x_dir_w (port %d) %02x\n", machine().describe_context(), offset, data); + if (offset < 2) + { + m_dir[offset] = data; + // write back to the port + xav_7a0x_dat_w(offset,m_dat[offset]); + } + +} + +void xavix_io_device::xav_7a0x_dat_w(offs_t offset, uint8_t data) +{ + LOG("%s: xavix IO xav_7a0x_dat_w (port %d) %02x\n", machine().describe_context(), offset, data); + if (offset < 2) + { + m_dat[offset] = data; + + uint8_t outdata = m_dat[offset] & m_dir[offset]; + + switch (offset) + { + case 0x0: m_out0_cb(outdata); break; + case 0x1: m_out1_cb(outdata); break; + } + } +} + +uint8_t xavix_io_device::xav_7a0x_dir_r(offs_t offset) +{ + uint8_t ret = 0x00; + LOG("%s: xavix IO xav_7a0x_dir_r (port %d)\n", machine().describe_context(), offset); + if (offset < 2) + { + ret = m_dir[offset]; + } + return ret; +} + +uint8_t xavix_io_device::xav_7a0x_dat_r(offs_t offset) +{ + uint8_t ret = 0x00; + LOG("%s: xavix IO xav_7a0x_dat_r (port %d)\n", machine().describe_context(), offset); + if (offset < 2) + { + switch (offset) + { + case 0x0: ret = m_in0_cb(); break; + case 0x1: ret = m_in1_cb(); break; + } + + ret &= ~m_dir[offset]; + ret |= m_dat[offset] & m_dir[offset]; + } + return ret; +} |