diff options
Diffstat (limited to 'src/devices/bus/wangpc/mcc.cpp')
-rw-r--r-- | src/devices/bus/wangpc/mcc.cpp | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/src/devices/bus/wangpc/mcc.cpp b/src/devices/bus/wangpc/mcc.cpp new file mode 100644 index 00000000000..35a664201b9 --- /dev/null +++ b/src/devices/bus/wangpc/mcc.cpp @@ -0,0 +1,265 @@ +// license:BSD-3-Clause +// copyright-holders:Curt Coder +/********************************************************************** + + Wang PC-PM043 Multiport Communications Controller emulation + +**********************************************************************/ + +/* + + TODO: + + - all + +*/ + +#include "mcc.h" + + + +//************************************************************************** +// MACROS/CONSTANTS +//************************************************************************** + +#define LOG 0 + +#define OPTION_ID 0x1f + +#define Z80SIO2_TAG "z80sio2" +#define Z80DART_TAG "z80dart" + +#define FUNCTION_PORT1_EXT_CLK BIT(m_option, 0) +#define FUNCTION_PORT1_NRZI BIT(m_option, 1) +#define FUNCTION_PORT1_RI_IE BIT(m_option, 2) +#define FUNCTION_PORT2_EXT_CLK BIT(m_option, 3) +#define FUNCTION_PORT2_NRZI BIT(m_option, 4) +#define FUNCTION_PORT2_RI_IE BIT(m_option, 5) +#define FUNCTION_IRQ_MASK (m_option & 0xc0) +#define FUNCTION_IRQ2 0x00 +#define FUNCTION_IRQ3 0x40 +#define FUNCTION_IRQ4 0x80 +#define FUNCTION_IRQ_INVALID 0xc0 + + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type WANGPC_MCC = &device_creator<wangpc_mcc_device>; + + +//------------------------------------------------- +// MACHINE_CONFIG_FRAGMENT( wangpc_mcc ) +//------------------------------------------------- + +static MACHINE_CONFIG_FRAGMENT( wangpc_mcc ) + MCFG_Z80SIO2_ADD(Z80SIO2_TAG, 4000000, 0, 0, 0, 0) + MCFG_Z80DART_ADD(Z80DART_TAG, 4000000, 0, 0, 0, 0) +MACHINE_CONFIG_END + + +//------------------------------------------------- +// machine_config_additions - device-specific +// machine configurations +//------------------------------------------------- + +machine_config_constructor wangpc_mcc_device::device_mconfig_additions() const +{ + return MACHINE_CONFIG_NAME( wangpc_mcc ); +} + + + +//************************************************************************** +// INLINE HELPERS +//************************************************************************** + +//------------------------------------------------- +// set_irq - +//------------------------------------------------- + +inline void wangpc_mcc_device::set_irq(int state) +{ + m_irq = state; + + switch (FUNCTION_IRQ_MASK) + { + case FUNCTION_IRQ2: m_bus->irq2_w(m_irq); break; + case FUNCTION_IRQ3: m_bus->irq3_w(m_irq); break; + case FUNCTION_IRQ4: m_bus->irq4_w(m_irq); break; + } +} + + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// wangpc_mcc_device - constructor +//------------------------------------------------- + +wangpc_mcc_device::wangpc_mcc_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, WANGPC_MCC, "Wang PC-PM043", tag, owner, clock, "wangpc_mcc", __FILE__), + device_wangpcbus_card_interface(mconfig, *this), + m_sio(*this, Z80SIO2_TAG), + m_dart(*this, Z80DART_TAG) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void wangpc_mcc_device::device_start() +{ + // state saving + save_item(NAME(m_option)); +} + + +//------------------------------------------------- +// device_reset - device-specific reset +//------------------------------------------------- + +void wangpc_mcc_device::device_reset() +{ + m_option = 0; + + set_irq(CLEAR_LINE); +} + + +//------------------------------------------------- +// wangpcbus_iorc_r - I/O read +//------------------------------------------------- + +UINT16 wangpc_mcc_device::wangpcbus_iorc_r(address_space &space, offs_t offset, UINT16 mem_mask) +{ + UINT16 data = 0xffff; + + if (sad(offset)) + { + switch (offset & 0x7f) + { + case 0x00/2: + case 0x02/2: + case 0x04/2: + case 0x06/2: + if (ACCESSING_BITS_0_7) + { + data = 0xff00 | m_sio->cd_ba_r(space, offset >> 1); + } + break; + + case 0x08/2: + case 0x0a/2: + case 0x0c/2: + case 0x0e/2: + if (ACCESSING_BITS_0_7) + { + data = 0xff00 | m_dart->cd_ba_r(space, offset >> 1); + } + break; + + case 0x10/2: + // board status + /* + + bit description + + 0 SIO channel A WAIT/RDY + 1 SIO channel B WAIT/RDY + 2 SIO channel A DSR + 3 SIO channel B DSR + 4 SIO channel A RI + 5 SIO channel B RI + 6 DART channel A WAIT/RDY + 7 DART channel A DSR + 8 DART channel B WAIT/RDY + 9 0 (1 for PC-PM042) + 10 0 (1 for PC-PM042) + 11 0 (1 for PC-PM042) + 12 1 + 13 1 + 14 1 + 15 1 + + */ + data = 0xf000; + break; + + case 0xfe/2: + data = 0xff00 | (m_irq << 7) | OPTION_ID; + break; + } + } + + return data; +} + + +//------------------------------------------------- +// wangpcbus_aiowc_w - I/O write +//------------------------------------------------- + +void wangpc_mcc_device::wangpcbus_aiowc_w(address_space &space, offs_t offset, UINT16 mem_mask, UINT16 data) +{ + if (sad(offset) && ACCESSING_BITS_0_7) + { + switch (offset & 0x7f) + { + case 0x00/2: + case 0x02/2: + case 0x04/2: + case 0x06/2: + m_sio->cd_ba_w(space, offset >> 1, data & 0xff); + break; + + case 0x08/2: + case 0x0a/2: + case 0x0c/2: + case 0x0e/2: + m_dart->cd_ba_w(space, offset >> 1, data & 0xff); + break; + + case 0x12/2: + // port 1 baud rate + break; + + case 0x14/2: + // port 2 baud rate + break; + + case 0x16/2: + { + // ports 1 and 2 function + bool irq = (m_irq == ASSERT_LINE); + bool changed = (FUNCTION_IRQ_MASK != (data & 0xc0)); + + if (irq && changed) set_irq(CLEAR_LINE); + + m_option = data & 0xff; + + if (irq && changed) set_irq(ASSERT_LINE); + } + break; + + case 0x18/2: + // port 3 channel A baud rate + break; + + case 0x1a/2: + // port 3 channel B baud rate + break; + + case 0xfc/2: + device_reset(); + break; + } + } +} |