diff options
Diffstat (limited to 'src/devices/cpu/z80/kl5c80a16.cpp')
-rw-r--r-- | src/devices/cpu/z80/kl5c80a16.cpp | 99 |
1 files changed, 98 insertions, 1 deletions
diff --git a/src/devices/cpu/z80/kl5c80a16.cpp b/src/devices/cpu/z80/kl5c80a16.cpp index 8fa31925366..d92cc9142de 100644 --- a/src/devices/cpu/z80/kl5c80a16.cpp +++ b/src/devices/cpu/z80/kl5c80a16.cpp @@ -11,7 +11,7 @@ — Synchronous serial port (KP62) (unemulated) — 16-bit timer/counters (KP63A) — 16-level interrupt controller (KP69) - — Parallel ports (KP67) (unemulated) + — Parallel ports (KP67) — External bus/DRAM interface unit (unemulated) ***************************************************************************/ @@ -35,6 +35,11 @@ kl5c80a16_device::kl5c80a16_device(const machine_config &mconfig, const char *ta address_map_constructor(), address_map_constructor(FUNC(kl5c80a16_device::internal_io), this)) , m_kp69(*this, "kp69") + , m_port_in_callback(*this) + , m_port_out_callback(*this) + , m_port_data{0, 0, 0, 0} + , m_port_direction{0x0f, 0, 0, 0} + , m_port_3state{0, 0, 0, 0} { } @@ -51,6 +56,22 @@ void kl5c80a16_device::internal_io(address_map &map) map(0x35, 0x35).mirror(0xff00).rw(m_kp69, FUNC(kp69_device::isrh_r), FUNC(kp69_device::lerh_pgrh_w)); map(0x36, 0x36).mirror(0xff00).rw(m_kp69, FUNC(kp69_device::imrl_r), FUNC(kp69_device::imrl_w)); map(0x37, 0x37).mirror(0xff00).rw(m_kp69, FUNC(kp69_device::imrh_r), FUNC(kp69_device::ivr_imrh_w)); + map(0x38, 0x3f).mirror(0xff00).rw(FUNC(kl5c80a16_device::port_r), FUNC(kl5c80a16_device::port_w)); +} + + +//------------------------------------------------- +// device_resolve_objects - resolve objects that +// may be needed for other devices to set +// initial conditions at start time +//------------------------------------------------- + +void kl5c80a16_device::device_resolve_objects() +{ + // Resolve parallel port callbacks + for (int i = 0; i < 4; i++) + m_port_in_callback[i].resolve_safe(m_port_3state[i]); + m_port_out_callback.resolve_all_safe(); } @@ -63,6 +84,10 @@ void kl5c80a16_device::device_start() kc82_device::device_start(); m_kp69->add_to_state(*this, KP69_IRR); + + // Register save state + save_item(NAME(m_port_data)); + save_item(NAME(m_port_direction)); } @@ -73,6 +98,14 @@ void kl5c80a16_device::device_start() void kl5c80a16_device::device_reset() { kc82_device::device_reset(); + + // Reset parallel port registers (Port 0 direction is fixed to upper 4 bits input & lower 4 bits output) + std::fill(std::begin(m_port_data), std::end(m_port_data), 0x00); + std::fill(std::begin(m_port_direction) + 1, std::end(m_port_direction), 0x00); + + // Reset parallel port outputs + for (int i = 1; i < 4; i++) + m_port_out_callback[i](0, m_port_3state[i] & ~m_port_direction[i], m_port_direction[i]); } @@ -104,3 +137,67 @@ void kl5c80a16_device::device_config_complete() { set_daisy_config(pseudo_daisy_config); } + + +//************************************************************************** +// KP67 PARALLEL PORT +//************************************************************************** + +//------------------------------------------------- +// port_r - read from parallel port data or +// direction register +//------------------------------------------------- + +u8 kl5c80a16_device::port_r(offs_t offset) +{ + if (BIT(offset, 0)) + return m_port_direction[offset >> 1]; + else + { + u8 data = m_port_data[offset >> 1]; + const u8 dir = m_port_direction[offset >> 1]; + if (dir != 0xff) + data = (data & dir) | (m_port_in_callback[offset >> 1](0, u8(~dir)) & ~dir); + return data; + } +} + + +//------------------------------------------------- +// port_w - write to parallel port data or +// direction register or bit control +//------------------------------------------------- + +void kl5c80a16_device::port_w(offs_t offset, u8 data) +{ + unsigned p = offset >> 1; + u8 dir = m_port_direction[p]; + if (offset == 1) + { + // Bit set/reset command + const unsigned b = BIT(data, 1, 3); + p = BIT(data, 4, 2); + if (BIT(m_port_data[p], b) == BIT(data, 0)) + return; + data = (m_port_data[p] ^= 1 << b); + dir = m_port_direction[p]; + if (!BIT(dir, b)) + return; + } + else if (BIT(offset, 0)) + { + if (dir == data) + return; + m_port_direction[p] = dir = data; + data = m_port_data[p]; + } + else + { + u8 old_data = std::exchange(m_port_data[p], data); + if (((old_data ^ data) & dir) == 0) + return; + } + + // Update port output + m_port_out_callback[offset >> 1](0, (data & dir) | (m_port_3state[offset >> 1] & ~dir), dir); +} |