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imds2: printer output completed, seems OK
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fulivi
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commit
a7402d0c96
@ -35,7 +35,7 @@
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//
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// This board acts as a controller for all I/O of the system.
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// It is structured as if it were 2 boards in one:
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// One part (around 8080) controls Keyboard, CRT & floppy, the other part (around PIO 8741) controls all parallel I/Os
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// One part (around 8080) controls Keyboard, CRT & floppy, the other part (around PIO 8041A) controls all parallel I/Os
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// (Line printer, Paper tape puncher, Paper tape reader, I/O to PROM programmer).
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// Both parts are interfaced to IPC through a bidirectional 8-bit bus.
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// IOC is composed of these parts:
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@ -51,7 +51,7 @@
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// A20 8275 CRT controller
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// A19 2708 Character generator ROM
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// LS1 3.3 kHz beeper
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//*A72 8741-4 CPU @ 6 MHz (PIO: parallel I/O)
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// A72 8041A CPU @ 6 MHz (PIO: parallel I/O)
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//
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// **********
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// Keyboard controller
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@ -63,8 +63,6 @@
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// ICs that are not emulated yet are marked with "*"
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//
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// TODO:
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// - Emulate PIO. No known dumps of its ROM are available, though.
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// - Emulate line printer output on PIO
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// - Emulate serial channels on IPC
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// - Emulate PIT on IPC
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// - Adjust speed of processors. Wait states are not accounted for yet.
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@ -86,8 +84,6 @@
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// should be mounted and the system reset. After a few seconds the ISIS-II
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// prompt should appear. A command that could be tried is "DIR" that lists
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// the content of floppy disk.
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// Please note that the message "FAILURE -- PIO NOT RESPONDING" is normal
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// as the support for PIO isn't implemented yet
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#include "includes/imds2.h"
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@ -174,6 +170,7 @@ imds2_state::imds2_state(const machine_config &mconfig, device_type type, const
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m_palette(*this , "palette"),
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m_gfxdecode(*this, "gfxdecode"),
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m_floppy0(*this , FLOPPY_0),
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m_centronics(*this , "centronics"),
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m_io_key0(*this , "KEY0"),
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m_io_key1(*this , "KEY1"),
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m_io_key2(*this , "KEY2"),
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@ -182,7 +179,8 @@ imds2_state::imds2_state(const machine_config &mconfig, device_type type, const
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m_io_key5(*this , "KEY5"),
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m_io_key6(*this , "KEY6"),
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m_io_key7(*this , "KEY7"),
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m_ioc_options(*this , "IOC_OPTS")
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m_ioc_options(*this , "IOC_OPTS"),
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m_device_status_byte(0xff)
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{
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}
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@ -439,8 +437,13 @@ WRITE8_MEMBER(imds2_state::imds2_ioc_mem_w)
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READ8_MEMBER(imds2_state::imds2_pio_port_p1_r)
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{
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// TODO
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return 0;
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// If STATUS ENABLE/ == 0 return inverted device status byte, else return 0xff
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// STATUS ENABLE/ == 0 when P23-P20 == 12 & P24 == 0 & P25 = 1 & P26 = 1
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if ((m_pio_port2 & 0x7f) == 0x6c) {
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return ~m_device_status_byte;
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} else {
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return 0xff;
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}
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}
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WRITE8_MEMBER(imds2_state::imds2_pio_port_p1_w)
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@ -462,6 +465,34 @@ WRITE8_MEMBER(imds2_state::imds2_pio_port_p2_w)
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m_ipclocpic->ir5_w(BIT(data , 7));
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}
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WRITE_LINE_MEMBER(imds2_state::imds2_pio_lpt_ack_w)
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{
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if (state) {
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m_device_status_byte |= 0x20;
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} else {
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m_device_status_byte &= ~0x20;
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}
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}
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WRITE_LINE_MEMBER(imds2_state::imds2_pio_lpt_busy_w)
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{
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// Busy is active high in centronics_device whereas it's active low in MDS
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if (!state) {
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m_device_status_byte |= 0x10;
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} else {
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m_device_status_byte &= ~0x10;
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}
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}
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WRITE_LINE_MEMBER(imds2_state::imds2_pio_lpt_select_w)
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{
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if (state) {
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m_device_status_byte |= 0x40;
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} else {
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m_device_status_byte &= ~0x40;
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}
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}
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I8275_DRAW_CHARACTER_MEMBER(imds2_state::crtc_display_pixels)
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{
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unsigned i;
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@ -574,7 +605,24 @@ void imds2_state::imds2_update_beeper(void)
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void imds2_state::imds2_update_printer(void)
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{
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// TODO
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// Data to printer is ~P1 when STATUS ENABLE/==1, else 0xff (assuming pull-ups on printer)
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UINT8 printer_data;
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if ((m_pio_port2 & 0x7f) == 0x6c) {
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printer_data = 0xff;
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} else {
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printer_data = ~m_pio_port1;
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}
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m_centronics->write_data0(BIT(printer_data , 0));
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m_centronics->write_data1(BIT(printer_data , 1));
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m_centronics->write_data2(BIT(printer_data , 2));
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m_centronics->write_data3(BIT(printer_data , 3));
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m_centronics->write_data4(BIT(printer_data , 4));
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m_centronics->write_data5(BIT(printer_data , 5));
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m_centronics->write_data6(BIT(printer_data , 6));
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m_centronics->write_data7(BIT(printer_data , 7));
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// LPT DATA STROBE/ == 0 when P23-P20 == 9 & P24 == 0
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m_centronics->write_strobe((m_pio_port2 & 0x1f) != 0x09);
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}
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static INPUT_PORTS_START(imds2)
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@ -773,6 +821,11 @@ static MACHINE_CONFIG_START(imds2 , imds2_state)
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MCFG_CPU_ADD("kbcpu", I8741, XTAL_3_579545MHz) /* 3.579545 MHz */
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MCFG_CPU_IO_MAP(kb_io_map)
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MCFG_QUANTUM_TIME(attotime::from_hz(100))
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MCFG_CENTRONICS_ADD("centronics", centronics_devices, "printer")
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MCFG_CENTRONICS_ACK_HANDLER(WRITELINE(imds2_state , imds2_pio_lpt_ack_w))
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MCFG_CENTRONICS_BUSY_HANDLER(WRITELINE(imds2_state , imds2_pio_lpt_busy_w))
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MCFG_CENTRONICS_PERROR_HANDLER(WRITELINE(imds2_state , imds2_pio_lpt_select_w))
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MACHINE_CONFIG_END
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ROM_START(imds2)
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@ -789,7 +842,7 @@ ROM_START(imds2)
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// ROM definition of PIO controller (8041A)
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ROM_REGION(0x400 , "iocpio" , 0)
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ROM_LOAD("pio_a72.bin" , 0 , 0x400 , CRC(c1eabf25))
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ROM_LOAD("pio_a72.bin" , 0 , 0x400 , BAD_DUMP CRC(9a446534))
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// ROM definition of keyboard controller (8741)
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ROM_REGION(0x400 , "kbcpu" , 0)
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@ -15,6 +15,7 @@
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#include "machine/pic8259.h"
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#include "machine/i8271.h"
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#include "imagedev/flopdrv.h"
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#include "bus/centronics/ctronics.h"
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class imds2_state : public driver_device
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{
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@ -57,6 +58,9 @@ class imds2_state : public driver_device
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DECLARE_WRITE8_MEMBER(imds2_pio_port_p1_w);
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DECLARE_READ8_MEMBER(imds2_pio_port_p2_r);
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DECLARE_WRITE8_MEMBER(imds2_pio_port_p2_w);
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DECLARE_WRITE_LINE_MEMBER(imds2_pio_lpt_ack_w);
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DECLARE_WRITE_LINE_MEMBER(imds2_pio_lpt_busy_w);
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DECLARE_WRITE_LINE_MEMBER(imds2_pio_lpt_select_w);
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I8275_DRAW_CHARACTER_MEMBER(crtc_display_pixels);
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@ -80,6 +84,7 @@ class imds2_state : public driver_device
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required_device<palette_device> m_palette;
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required_device<gfxdecode_device> m_gfxdecode;
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required_device<legacy_floppy_image_device> m_floppy0;
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required_device<centronics_device> m_centronics;
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required_ioport m_io_key0;
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required_ioport m_io_key1;
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required_ioport m_io_key2;
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@ -129,6 +134,9 @@ class imds2_state : public driver_device
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// PIO port 2
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UINT8 m_pio_port2;
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// PIO device status byte
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UINT8 m_device_status_byte;
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};
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#endif /* _IMDS2_H_ */
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