diff options
Diffstat (limited to 'src/devices/bus/vcs_ctrl/cx85.cpp')
-rw-r--r-- | src/devices/bus/vcs_ctrl/cx85.cpp | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/src/devices/bus/vcs_ctrl/cx85.cpp b/src/devices/bus/vcs_ctrl/cx85.cpp new file mode 100644 index 00000000000..f4543e6cd34 --- /dev/null +++ b/src/devices/bus/vcs_ctrl/cx85.cpp @@ -0,0 +1,126 @@ +// license:BSD-3-Clause +// copyright-holders:AJR +/********************************************************************** + + Atari CX85 Numeric Keypad + + Normal Atari 400/800 usage has this connect to controller port 2. + +**********************************************************************/ + +#include "emu.h" +#include "cx85.h" + +#include "machine/rescap.h" + + +//************************************************************************** +// DEVICE TYPE DEFINITION +//************************************************************************** + +DEFINE_DEVICE_TYPE(ATARI_CX85, atari_cx85_device, "atari_cx85", "Atari CX85 Numeric Keypad") + + +//************************************************************************** +// INPUT PORTS +//************************************************************************** + +static INPUT_PORTS_START(atari_cx85) + PORT_START("X1") + PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYPAD) PORT_NAME("Keypad -") PORT_CODE(KEYCODE_PLUS_PAD) + PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYPAD) PORT_NAME("Keypad 3") PORT_CODE(KEYCODE_3_PAD) + PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYPAD) PORT_NAME("Keypad 9") PORT_CODE(KEYCODE_9_PAD) + PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYPAD) PORT_NAME("Keypad 6") PORT_CODE(KEYCODE_6_PAD) + PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_UNUSED) + + PORT_START("X2") + PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYPAD) PORT_NAME("Keypad + Enter") PORT_CODE(KEYCODE_ENTER_PAD) + PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYPAD) PORT_NAME("Keypad 2") PORT_CODE(KEYCODE_2_PAD) + PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYPAD) PORT_NAME("Keypad 8") PORT_CODE(KEYCODE_8_PAD) + PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYPAD) PORT_NAME("Keypad 5") PORT_CODE(KEYCODE_5_PAD) + PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_UNUSED) + + PORT_START("X3") + PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYPAD) PORT_NAME("Keypad .") PORT_CODE(KEYCODE_DEL_PAD) + PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYPAD) PORT_NAME("Keypad 1") PORT_CODE(KEYCODE_1_PAD) + PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYPAD) PORT_NAME("Keypad 7") PORT_CODE(KEYCODE_7_PAD) + PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYPAD) PORT_NAME("Keypad 4") PORT_CODE(KEYCODE_4_PAD) + PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_UNUSED) + + PORT_START("X4") + PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYPAD) PORT_NAME("Keypad 0") PORT_CODE(KEYCODE_0_PAD) + PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYPAD) PORT_NAME("Keypad F4 (Yes)") PORT_CODE(KEYCODE_MINUS_PAD) + PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYPAD) PORT_NAME("Keypad F2 (No)") PORT_CODE(KEYCODE_SLASH_PAD) + PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYPAD) PORT_NAME("Keypad F3 (Delete)") PORT_CODE(KEYCODE_ASTERISK) + PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYPAD) PORT_NAME("Keypad F1 (Escape)") PORT_CODE(KEYCODE_NUMLOCK) +INPUT_PORTS_END + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// atari_cx85_device - constructor +//------------------------------------------------- + +atari_cx85_device::atari_cx85_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) + : device_t(mconfig, ATARI_CX85, tag, owner, clock) + , device_vcs_control_port_interface(mconfig, *this) + , m_encoder(*this, "encoder") +{ +} + +//------------------------------------------------- +// device_add_mconfig - add device configuration +//------------------------------------------------- + +void atari_cx85_device::device_add_mconfig(machine_config &config) +{ + MM74C923(config, m_encoder, 0); // MCM74C923N + m_encoder->set_cap_osc(CAP_U(.1)); + m_encoder->set_cap_debounce(CAP_U(.47)); + m_encoder->data_tri_callback().set_constant(0); + m_encoder->x1_rd_callback().set_ioport("X1"); + m_encoder->x2_rd_callback().set_ioport("X2"); + m_encoder->x3_rd_callback().set_ioport("X3"); + m_encoder->x4_rd_callback().set_ioport("X4"); + m_encoder->da_wr_callback().set(FUNC(atari_cx85_device::trigger_w)).invert(); +} + +//------------------------------------------------- +// device_input_ports - device-specific input ports +//------------------------------------------------- + +ioport_constructor atari_cx85_device::device_input_ports() const +{ + return INPUT_PORTS_NAME(atari_cx85); +} + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void atari_cx85_device::device_start() +{ +} + +//------------------------------------------------- +// vcs_joy_r - read digital inputs +//------------------------------------------------- + +u8 atari_cx85_device::vcs_joy_r() +{ + // 74C923 outputs are buffered through 4049B + return (~m_encoder->read() & 0x0f) | (m_encoder->da_r() ? 0 : 0x20); +} + +//------------------------------------------------- +// vcs_pot_x_r - sample B pot +//------------------------------------------------- + +u8 atari_cx85_device::vcs_pot_x_r() +{ + // Schematics suggests this should also be inverted through 4049B, but drivers seem to work the opposite way + return BIT(m_encoder->read(), 4) ? 0xff : 0; +} |