diff --git a/src/mess/drivers/imds2.c b/src/mess/drivers/imds2.c index a711a519a72..746d900dfc1 100644 --- a/src/mess/drivers/imds2.c +++ b/src/mess/drivers/imds2.c @@ -35,7 +35,7 @@ // // This board acts as a controller for all I/O of the system. // It is structured as if it were 2 boards in one: -// One part (around 8080) controls Keyboard, CRT & floppy, the other part (around PIO 8741) controls all parallel I/Os +// One part (around 8080) controls Keyboard, CRT & floppy, the other part (around PIO 8041A) controls all parallel I/Os // (Line printer, Paper tape puncher, Paper tape reader, I/O to PROM programmer). // Both parts are interfaced to IPC through a bidirectional 8-bit bus. // IOC is composed of these parts: @@ -51,7 +51,7 @@ // A20 8275 CRT controller // A19 2708 Character generator ROM // LS1 3.3 kHz beeper -//*A72 8741-4 CPU @ 6 MHz (PIO: parallel I/O) +// A72 8041A CPU @ 6 MHz (PIO: parallel I/O) // // ********** // Keyboard controller @@ -63,8 +63,6 @@ // ICs that are not emulated yet are marked with "*" // // TODO: -// - Emulate PIO. No known dumps of its ROM are available, though. -// - Emulate line printer output on PIO // - Emulate serial channels on IPC // - Emulate PIT on IPC // - Adjust speed of processors. Wait states are not accounted for yet. @@ -86,8 +84,6 @@ // should be mounted and the system reset. After a few seconds the ISIS-II // prompt should appear. A command that could be tried is "DIR" that lists // the content of floppy disk. -// Please note that the message "FAILURE -- PIO NOT RESPONDING" is normal -// as the support for PIO isn't implemented yet #include "includes/imds2.h" @@ -114,7 +110,7 @@ static ADDRESS_MAP_START(ipc_io_map , AS_IO , 8 , imds2_state) ADDRESS_MAP_UNMAP_LOW AM_RANGE(0xc0 , 0xc0) AM_READWRITE(imds2_ipc_dbbout_r , imds2_ipc_dbbin_data_w) AM_RANGE(0xc1 , 0xc1) AM_READWRITE(imds2_ipc_status_r , imds2_ipc_dbbin_cmd_w) - AM_RANGE(0xf8 , 0xf9) AM_DEVREADWRITE("iocpio" , i8041_device , upi41_master_r , upi41_master_w) + AM_RANGE(0xf8 , 0xf9) AM_DEVREADWRITE("iocpio" , i8041_device , upi41_master_r , upi41_master_w) AM_RANGE(0xfa , 0xfb) AM_READWRITE(imds2_ipclocpic_r , imds2_ipclocpic_w) AM_RANGE(0xfc , 0xfd) AM_READWRITE(imds2_ipcsyspic_r , imds2_ipcsyspic_w) AM_RANGE(0xff , 0xff) AM_WRITE(imds2_ipc_control_w) @@ -169,11 +165,12 @@ imds2_state::imds2_state(const machine_config &mconfig, device_type type, const m_iocbeep(*this , "iocbeep"), m_ioctimer(*this , "ioctimer"), m_iocfdc(*this , "iocfdc"), - m_iocpio(*this , "iocpio"), + m_iocpio(*this , "iocpio"), m_kbcpu(*this , "kbcpu"), m_palette(*this , "palette"), m_gfxdecode(*this, "gfxdecode"), m_floppy0(*this , FLOPPY_0), + m_centronics(*this , "centronics"), m_io_key0(*this , "KEY0"), m_io_key1(*this , "KEY1"), m_io_key2(*this , "KEY2"), @@ -182,7 +179,8 @@ imds2_state::imds2_state(const machine_config &mconfig, device_type type, const m_io_key5(*this , "KEY5"), m_io_key6(*this , "KEY6"), m_io_key7(*this , "KEY7"), - m_ioc_options(*this , "IOC_OPTS") + m_ioc_options(*this , "IOC_OPTS"), + m_device_status_byte(0xff) { } @@ -439,29 +437,62 @@ WRITE8_MEMBER(imds2_state::imds2_ioc_mem_w) READ8_MEMBER(imds2_state::imds2_pio_port_p1_r) { - // TODO - return 0; + // If STATUS ENABLE/ == 0 return inverted device status byte, else return 0xff + // STATUS ENABLE/ == 0 when P23-P20 == 12 & P24 == 0 & P25 = 1 & P26 = 1 + if ((m_pio_port2 & 0x7f) == 0x6c) { + return ~m_device_status_byte; + } else { + return 0xff; +} } WRITE8_MEMBER(imds2_state::imds2_pio_port_p1_w) { - m_pio_port1 = data; - imds2_update_printer(); + m_pio_port1 = data; + imds2_update_printer(); } READ8_MEMBER(imds2_state::imds2_pio_port_p2_r) { - return m_pio_port2; + return m_pio_port2; } WRITE8_MEMBER(imds2_state::imds2_pio_port_p2_w) { - m_pio_port2 = data; - imds2_update_printer(); + m_pio_port2 = data; + imds2_update_printer(); // Send INTR to IPC m_ipclocpic->ir5_w(BIT(data , 7)); } +WRITE_LINE_MEMBER(imds2_state::imds2_pio_lpt_ack_w) +{ + if (state) { + m_device_status_byte |= 0x20; + } else { + m_device_status_byte &= ~0x20; + } +} + +WRITE_LINE_MEMBER(imds2_state::imds2_pio_lpt_busy_w) +{ + // Busy is active high in centronics_device whereas it's active low in MDS + if (!state) { + m_device_status_byte |= 0x10; + } else { + m_device_status_byte &= ~0x10; + } +} + +WRITE_LINE_MEMBER(imds2_state::imds2_pio_lpt_select_w) +{ + if (state) { + m_device_status_byte |= 0x40; + } else { + m_device_status_byte &= ~0x40; + } +} + I8275_DRAW_CHARACTER_MEMBER(imds2_state::crtc_display_pixels) { unsigned i; @@ -574,7 +605,24 @@ void imds2_state::imds2_update_beeper(void) void imds2_state::imds2_update_printer(void) { - // TODO + // Data to printer is ~P1 when STATUS ENABLE/==1, else 0xff (assuming pull-ups on printer) + UINT8 printer_data; + if ((m_pio_port2 & 0x7f) == 0x6c) { + printer_data = 0xff; + } else { + printer_data = ~m_pio_port1; + } + m_centronics->write_data0(BIT(printer_data , 0)); + m_centronics->write_data1(BIT(printer_data , 1)); + m_centronics->write_data2(BIT(printer_data , 2)); + m_centronics->write_data3(BIT(printer_data , 3)); + m_centronics->write_data4(BIT(printer_data , 4)); + m_centronics->write_data5(BIT(printer_data , 5)); + m_centronics->write_data6(BIT(printer_data , 6)); + m_centronics->write_data7(BIT(printer_data , 7)); + + // LPT DATA STROBE/ == 0 when P23-P20 == 9 & P24 == 0 + m_centronics->write_strobe((m_pio_port2 & 0x1f) != 0x09); } static INPUT_PORTS_START(imds2) @@ -766,13 +814,18 @@ static MACHINE_CONFIG_START(imds2 , imds2_state) MCFG_LEGACY_FLOPPY_DRIVE_ADD(FLOPPY_0, imds2_floppy_interface) - MCFG_CPU_ADD("iocpio" , I8041 , IOC_XTAL_Y3) - MCFG_CPU_IO_MAP(pio_io_map) + MCFG_CPU_ADD("iocpio" , I8041 , IOC_XTAL_Y3) + MCFG_CPU_IO_MAP(pio_io_map) MCFG_QUANTUM_TIME(attotime::from_hz(100)) - + MCFG_CPU_ADD("kbcpu", I8741, XTAL_3_579545MHz) /* 3.579545 MHz */ MCFG_CPU_IO_MAP(kb_io_map) MCFG_QUANTUM_TIME(attotime::from_hz(100)) + + MCFG_CENTRONICS_ADD("centronics", centronics_devices, "printer") + MCFG_CENTRONICS_ACK_HANDLER(WRITELINE(imds2_state , imds2_pio_lpt_ack_w)) + MCFG_CENTRONICS_BUSY_HANDLER(WRITELINE(imds2_state , imds2_pio_lpt_busy_w)) + MCFG_CENTRONICS_PERROR_HANDLER(WRITELINE(imds2_state , imds2_pio_lpt_select_w)) MACHINE_CONFIG_END ROM_START(imds2) @@ -787,10 +840,10 @@ ROM_START(imds2) ROM_LOAD("ioc_a52.bin" , 0x1000 , 0x0800 , CRC(b88a38d5) SHA1(934716a1daec852f4d1f846510f42408df0c9584)) ROM_LOAD("ioc_a53.bin" , 0x1800 , 0x0800 , CRC(c8df4bb9) SHA1(2dfb921e94ae7033a7182457b2f00657674d1b77)) - // ROM definition of PIO controller (8041A) - ROM_REGION(0x400 , "iocpio" , 0) - ROM_LOAD("pio_a72.bin" , 0 , 0x400 , CRC(c1eabf25)) - + // ROM definition of PIO controller (8041A) + ROM_REGION(0x400 , "iocpio" , 0) + ROM_LOAD("pio_a72.bin" , 0 , 0x400 , BAD_DUMP CRC(9a446534)) + // ROM definition of keyboard controller (8741) ROM_REGION(0x400 , "kbcpu" , 0) ROM_LOAD("kbd511.bin" , 0 , 0x400 , CRC(ba7c4303) SHA1(19899af732d0ae1247bfc79979b1ee5f339ee5cf)) diff --git a/src/mess/includes/imds2.h b/src/mess/includes/imds2.h index 144445c2e6b..a7c05a46a8a 100644 --- a/src/mess/includes/imds2.h +++ b/src/mess/includes/imds2.h @@ -15,6 +15,7 @@ #include "machine/pic8259.h" #include "machine/i8271.h" #include "imagedev/flopdrv.h" +#include "bus/centronics/ctronics.h" class imds2_state : public driver_device { @@ -57,6 +58,9 @@ class imds2_state : public driver_device DECLARE_WRITE8_MEMBER(imds2_pio_port_p1_w); DECLARE_READ8_MEMBER(imds2_pio_port_p2_r); DECLARE_WRITE8_MEMBER(imds2_pio_port_p2_w); + DECLARE_WRITE_LINE_MEMBER(imds2_pio_lpt_ack_w); + DECLARE_WRITE_LINE_MEMBER(imds2_pio_lpt_busy_w); + DECLARE_WRITE_LINE_MEMBER(imds2_pio_lpt_select_w); I8275_DRAW_CHARACTER_MEMBER(crtc_display_pixels); @@ -75,11 +79,12 @@ class imds2_state : public driver_device required_device m_iocbeep; required_device m_ioctimer; required_device m_iocfdc; - required_device m_iocpio; + required_device m_iocpio; required_device m_kbcpu; required_device m_palette; required_device m_gfxdecode; required_device m_floppy0; + required_device m_centronics; required_ioport m_io_key0; required_ioport m_io_key1; required_ioport m_io_key2; @@ -95,7 +100,7 @@ class imds2_state : public driver_device bool imds2_in_ipc_rom(offs_t offset) const; void imds2_update_beeper(void); - void imds2_update_printer(void); + void imds2_update_printer(void); // IPC control port UINT8 m_ipc_control; @@ -124,11 +129,14 @@ class imds2_state : public driver_device // IPC/IOC status UINT8 m_ipc_ioc_status; - // PIO port 1 - UINT8 m_pio_port1; + // PIO port 1 + UINT8 m_pio_port1; - // PIO port 2 - UINT8 m_pio_port2; + // PIO port 2 + UINT8 m_pio_port2; + + // PIO device status byte + UINT8 m_device_status_byte; }; #endif /* _IMDS2_H_ */