// license:BSD-3-Clause // copyright-holders:hap /* Texas Instruments TMS1024/TMS1025 I/O expander No documentation was available, just a pinout. Other than more port pins, TMS1025 is assumed to be same as TMS1024. TODO: - writes to port 0 - what's the MS pin? - strobe is on rising edge? or falling edge? */ #include "machine/tms1024.h" const device_type TMS1024 = &device_creator; const device_type TMS1025 = &device_creator; //------------------------------------------------- // constructor //------------------------------------------------- tms1024_device::tms1024_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : device_t(mconfig, TMS1024, "TMS1024 I/O Expander", tag, owner, clock, "tms1024", __FILE__), m_h(0), m_s(0), m_std(0), m_write_port1(*this), m_write_port2(*this), m_write_port3(*this), m_write_port4(*this), m_write_port5(*this), m_write_port6(*this), m_write_port7(*this) { } tms1024_device::tms1024_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source) : device_t(mconfig, type, name, tag, owner, clock, shortname, source), m_h(0), m_s(0), m_std(0), m_write_port1(*this), m_write_port2(*this), m_write_port3(*this), m_write_port4(*this), m_write_port5(*this), m_write_port6(*this), m_write_port7(*this) { } tms1025_device::tms1025_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : tms1024_device(mconfig, TMS1025, "TMS1025 I/O Expander", tag, owner, clock, "tms1025", __FILE__) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void tms1024_device::device_start() { // resolve callbacks (there is no port 0) m_write_port1.resolve_safe(); m_write_port[0] = &m_write_port1; m_write_port2.resolve_safe(); m_write_port[1] = &m_write_port2; m_write_port3.resolve_safe(); m_write_port[2] = &m_write_port3; m_write_port4.resolve_safe(); m_write_port[3] = &m_write_port4; m_write_port5.resolve_safe(); m_write_port[4] = &m_write_port5; m_write_port6.resolve_safe(); m_write_port[5] = &m_write_port6; m_write_port7.resolve_safe(); m_write_port[6] = &m_write_port7; // zerofill m_h = 0; m_s = 0; m_std = 0; // register for savestates save_item(NAME(m_h)); save_item(NAME(m_s)); save_item(NAME(m_std)); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void tms1024_device::device_reset() { } //------------------------------------------------- // handlers //------------------------------------------------- WRITE8_MEMBER(tms1024_device::write_h) { // H1,2,3,4: data for outputs A,B,C,D m_h = data & 0xf; } WRITE8_MEMBER(tms1024_device::write_s) { // S0,1,2: select port m_s = data & 7; } WRITE_LINE_MEMBER(tms1024_device::write_std) { state = (state) ? 1 : 0; // output on rising edge if (state && !m_std) { if (m_s != 0) (*m_write_port[m_s-1])((offs_t)(m_s-1), m_h); } m_std = state; }