1 // license:BSD-3-Clause
2 // copyright-holders:Nigel Barnes
3 /***************************************************************************
4
5 Intel SBC 80/30 Single Board Computer
6
7 System Initialization (Reset):
8 The USART clock is initially set at 9600 baud. Two "U" characters are used
9 to check for baud rate. When the first "U" character is entered it is
10 checked for 9600, 4800, 2400, and 1200 baud rate. If a match is found then
11 that baud rate is set into the clock. If not, then a second "U" character
12 must be entered. The second "U" character is checked for 600, 300, 150,
13 and 110 baud. When the baud rate has been successfully determined, the sign
14 -on message "80/30 MONITOR" will be displayed on the console. When the
15 monitor is ready for a command, it will prompt with a period ".".
16
17 Download the User Manual to get the operating procedures.
18
19 Monitor Commands:
20 D Display memory command
21 G Program execute command
22 N Single step command
23 I Insert instruction into memory
24 M Move memory command
25 R Read hexadecimal file
26 S Substitute memory command
27 W Write hexadecimal file
28 X Examine and modify CPU registers
29
30 ****************************************************************************/
31
32 #include "emu.h"
33 #include "cpu/i8085/i8085.h"
34 #include "machine/pic8259.h"
35 #include "machine/pit8253.h"
36 #include "machine/i8255.h"
37 #include "machine/i8251.h"
38 #include "bus/rs232/rs232.h"
39
40
41 class isbc8030_state : public driver_device
42 {
43 public:
isbc8030_state(const machine_config & mconfig,device_type type,const char * tag)44 isbc8030_state(const machine_config &mconfig, device_type type, const char *tag)
45 : driver_device(mconfig, type, tag)
46 , m_maincpu(*this, "maincpu")
47 , m_usart(*this, "usart")
48 , m_ppi(*this, "ppi8255")
49 , m_pic(*this, "pic8259")
50 , m_pit(*this, "pit8253")
51 , m_rs232(*this, "rs232")
52 { }
53
54 void isbc8030(machine_config &config);
55
56 private:
57 void isbc8030_io(address_map &map);
58 void isbc8030_mem(address_map &map);
59
60 required_device<i8085a_cpu_device> m_maincpu;
61 required_device<i8251_device> m_usart;
62 required_device<i8255_device> m_ppi;
63 required_device<pic8259_device> m_pic;
64 required_device<pit8253_device> m_pit;
65 required_device<rs232_port_device> m_rs232;
66 };
67
isbc8030_mem(address_map & map)68 void isbc8030_state::isbc8030_mem(address_map &map)
69 {
70 map.unmap_value_high();
71 map(0x0000, 0x1fff).rom();
72 map(0x2000, 0xffff).ram();
73 }
74
isbc8030_io(address_map & map)75 void isbc8030_state::isbc8030_io(address_map &map)
76 {
77 map.unmap_value_high();
78 map.global_mask(0xff);
79 map(0xd8, 0xd9).rw(m_pic, FUNC(pic8259_device::read), FUNC(pic8259_device::write));
80 map(0xdc, 0xdf).rw(m_pit, FUNC(pit8253_device::read), FUNC(pit8253_device::write));
81 map(0xe8, 0xeb).rw(m_ppi, FUNC(i8255_device::read), FUNC(i8255_device::write));
82 map(0xec, 0xed).mirror(0x02).rw(m_usart, FUNC(i8251_device::read), FUNC(i8251_device::write));
83 }
84
INPUT_PORTS_START(isbc8030)85 static INPUT_PORTS_START( isbc8030 )
86 INPUT_PORTS_END
87
88 void isbc8030_state::isbc8030(machine_config &config)
89 {
90 I8085A(config, m_maincpu, XTAL(22'118'400) / 4);
91 m_maincpu->set_addrmap(AS_PROGRAM, &isbc8030_state::isbc8030_mem);
92 m_maincpu->set_addrmap(AS_IO, &isbc8030_state::isbc8030_io);
93 m_maincpu->in_inta_func().set(m_pic, FUNC(pic8259_device::acknowledge));
94
95 PIC8259(config, m_pic, 0);
96 m_pic->out_int_callback().set_inputline(m_maincpu, 0);
97
98 PIT8253(config, m_pit, 0);
99 m_pit->set_clk<0>(XTAL(22'118'400) / 18);
100 m_pit->out_handler<0>().set(m_pic, FUNC(pic8259_device::ir0_w));
101 m_pit->set_clk<1>(XTAL(22'118'400) / 18);
102 m_pit->set_clk<2>(XTAL(22'118'400) / 18);
103 m_pit->out_handler<2>().set(m_usart, FUNC(i8251_device::write_rxc));
104 m_pit->out_handler<2>().append(m_usart, FUNC(i8251_device::write_txc));
105
106 I8251(config, m_usart, 0);
107 m_usart->txd_handler().set(m_rs232, FUNC(rs232_port_device::write_txd));
108 m_usart->dtr_handler().set(m_rs232, FUNC(rs232_port_device::write_dtr));
109 m_usart->rts_handler().set(m_rs232, FUNC(rs232_port_device::write_rts));
110
111 I8255A(config, m_ppi, 0);
112
113 RS232_PORT(config, m_rs232, default_rs232_devices, "terminal");
114 m_rs232->rxd_handler().set(m_usart, FUNC(i8251_device::write_rxd));
115 m_rs232->dsr_handler().set(m_usart, FUNC(i8251_device::write_dsr));
116 m_rs232->cts_handler().set(m_usart, FUNC(i8251_device::write_cts));
117 }
118
119 /* ROM definition */
120 ROM_START( isbc8030 )
121 ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
122 ROM_LOAD( "mon830.bin", 0x0000, 0x0800, CRC(cda15115) SHA1(242dad14a919568178b363c3e27f22ec0a5849b3))
123 ROM_END
124
125 /* YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS */
126 COMP( 1978, isbc8030, 0, 0, isbc8030, isbc8030, isbc8030_state, empty_init, "Intel", "iSBC 80/30", MACHINE_NO_SOUND_HW )
127