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v100.cpp
448 lines (374 loc) · 17.6 KB
/
v100.cpp
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// license:BSD-3-Clause
// copyright-holders:AJR
/***********************************************************************************************************************************
The Visual 100 was the first of the second series of display terminals released by Visual Technology. (The Visual 200 and
Visual 210 made up the first series.) It was followed by the Visual 110 (which emulated the Data General Dasher series rather
than the DEC VT-100) and the "top of the line" Visual 400.
The second 8251 and 8116T seem to have been typically unpopulated. However, the program does include routines to drive these
components, which probably would be installed to provide the optional serial printer interface.
***********************************************************************************************************************************/
#include "emu.h"
#include "bus/rs232/rs232.h"
#include "cpu/z80/z80.h"
#include "machine/com8116.h"
#include "machine/er1400.h"
#include "machine/i8214.h"
#include "machine/i8251.h"
#include "machine/i8255.h"
#include "machine/input_merger.h"
#include "video/tms9927.h"
#include "screen.h"
namespace {
// character matrix is supposed to be only 7x7, but 15 produces correct timings
#define V100_CH_WIDTH 15
class v100_state : public driver_device
{
public:
v100_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag)
, m_maincpu(*this, "maincpu")
, m_screen(*this, "screen")
, m_vtac(*this, "vtac")
, m_usart(*this, "usart%u", 1)
, m_earom(*this, "earom")
, m_picu(*this, "picu")
, m_modem(*this, "modem")
, m_p_chargen(*this, "chargen")
, m_videoram(*this, "videoram")
, m_key_row(*this, "ROW%u", 0)
{ }
void v100(machine_config &config);
private:
u8 status_r();
void port30_w(u8 data);
u8 keyboard_r();
void key_row_w(u8 data);
void port48_w(u8 data);
void picu_w(u8 data);
template<int N> void picu_r_w(int state);
IRQ_CALLBACK_MEMBER(irq_ack);
void ppi_porta_w(u8 data);
u32 screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
void io_map(address_map &map);
void mem_map(address_map &map);
virtual void machine_start() override;
required_device<cpu_device> m_maincpu;
required_device<screen_device> m_screen;
required_device<crt5037_device> m_vtac;
required_device_array<i8251_device, 2> m_usart;
required_device<er1400_device> m_earom;
required_device<i8214_device> m_picu;
required_device<rs232_port_device> m_modem;
required_region_ptr<u8> m_p_chargen;
required_shared_ptr<u8> m_videoram;
optional_ioport_array<16> m_key_row;
u8 m_active_row = 0;
bool m_video_enable = false;
};
u32 v100_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
if (m_vtac->screen_reset() || !m_video_enable)
{
bitmap.fill(rgb_t::black(), cliprect);
return 0;
}
unsigned row0 = cliprect.top() / 10;
unsigned x0 = cliprect.left();
unsigned px0 = x0 % V100_CH_WIDTH;
unsigned columns = screen.visible_area().width() / V100_CH_WIDTH;
u16 start = 0;
unsigned y = 0;
for (unsigned row = 0; y <= cliprect.bottom(); row++)
{
start = m_videoram[start] | (m_videoram[(start + 1) & 0xfff] << 8);
u16 end = start + ((start & 0x3000) != 0 ? (columns / 2) + 1 : columns);
start &= 0xfff;
end &= 0xfff;
if (row < row0)
y += 10;
else
{
unsigned scan = 0;
if (row == row0)
{
scan += cliprect.top() - y;
y = cliprect.top();
}
while (scan < 10 && y <= cliprect.bottom())
{
unsigned x = x0, px = px0, addr = start;
u8 gfxdata = m_p_chargen[((m_videoram[addr] & 0x7f) << 4) | scan] << (px0 / 2);
while (x <= cliprect.right())
{
bitmap.pix(y, x) = BIT(gfxdata, 7) ? rgb_t::white() : rgb_t::black();
x++;
px++;
if ((px & 1) == 0)
gfxdata <<= 1;
if (px >= V100_CH_WIDTH)
{
addr = (addr + 1) & 0xfff;
gfxdata = m_p_chargen[((m_videoram[addr] & 0x7f) << 4) | scan];
px = 0;
if (addr == end)
{
while (x <= cliprect.right())
bitmap.pix(y, x++) = rgb_t::black();
break;
}
}
}
scan++;
y++;
}
}
start = end;
}
return 0;
}
void v100_state::machine_start()
{
m_picu->inte_w(1);
m_picu->etlg_w(1);
m_usart[1]->write_cts(0);
m_active_row = 0;
m_video_enable = false;
save_item(NAME(m_active_row));
save_item(NAME(m_video_enable));
}
u8 v100_state::status_r()
{
u8 status = 0xc0;
status |= m_earom->data_r();
status |= m_modem->dcd_r() << 1;
status |= m_modem->si_r() << 2; // SCCD (pin 12)
status |= m_modem->ri_r() << 3;
return status;
}
void v100_state::port30_w(u8 data)
{
// D6 = cursor/text blinking?
//logerror("Writing %02X to port 30\n", data);
}
u8 v100_state::keyboard_r()
{
return m_key_row[m_active_row & 15].read_safe(0xff);
}
void v100_state::key_row_w(u8 data)
{
m_active_row = data;
}
void v100_state::port48_w(u8 data)
{
//logerror("Writing %02X to port 48\n", data);
}
void v100_state::picu_w(u8 data)
{
m_picu->b_w((data & 0x0e) >> 1);
m_picu->sgs_w(BIT(data, 4));
}
template<int N>
void v100_state::picu_r_w(int state)
{
m_picu->r_w(N, state);
}
IRQ_CALLBACK_MEMBER(v100_state::irq_ack)
{
m_maincpu->set_input_line(0, CLEAR_LINE);
return (m_picu->a_r() << 1) | 0xf0;
}
void v100_state::ppi_porta_w(u8 data)
{
m_vtac->set_clock_scale(BIT(data, 5) ? 0.5 : 1.0);
m_screen->set_clock_scale(BIT(data, 5) ? 0.5 : 1.0);
m_video_enable = !BIT(data, 7);
//logerror("Writing %02X to PPI port A\n", data);
}
void v100_state::mem_map(address_map &map)
{
map(0x0000, 0x1fff).rom().region("maincpu", 0);
map(0x4000, 0x4fff).ram().share("videoram");
map(0x5000, 0x5fff).ram();
}
void v100_state::io_map(address_map &map)
{
map.global_mask(0xff);
map(0x00, 0x0f).w(m_vtac, FUNC(crt5037_device::write));
map(0x10, 0x10).w("brg1", FUNC(com8116_device::stt_str_w));
map(0x12, 0x13).rw("usart1", FUNC(i8251_device::read), FUNC(i8251_device::write));
map(0x14, 0x15).rw("usart2", FUNC(i8251_device::read), FUNC(i8251_device::write));
map(0x16, 0x16).w("brg2", FUNC(com8116_device::stt_str_w));
map(0x20, 0x20).r(FUNC(v100_state::status_r));
map(0x30, 0x30).w(FUNC(v100_state::port30_w));
map(0x40, 0x40).rw(FUNC(v100_state::keyboard_r), FUNC(v100_state::key_row_w));
map(0x48, 0x48).w(FUNC(v100_state::port48_w));
map(0x60, 0x60).w(FUNC(v100_state::picu_w));
map(0x70, 0x73).rw("ppi", FUNC(i8255_device::read), FUNC(i8255_device::write));
}
static INPUT_PORTS_START( v100 )
PORT_START("ROW0")
PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Set-Up") PORT_CODE(KEYCODE_F1)
PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_START("ROW1")
PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('=') PORT_CHAR('+') PORT_CODE(KEYCODE_EQUALS)
PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('`') PORT_CHAR('~') PORT_CODE(KEYCODE_TILDE)
PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR(']') PORT_CHAR('}') PORT_CODE(KEYCODE_CLOSEBRACE)
PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('\'') PORT_CHAR('"') PORT_CODE(KEYCODE_QUOTE)
PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Return") PORT_CHAR(0x0d) PORT_CODE(KEYCODE_ENTER)
PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Right Shift") PORT_CODE(KEYCODE_RSHIFT)
PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Line Feed") PORT_CHAR(0x0a)
PORT_START("ROW2")
PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('0') PORT_CHAR(')') PORT_CODE(KEYCODE_0)
PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('-') PORT_CHAR('_') PORT_CODE(KEYCODE_MINUS)
PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('p') PORT_CHAR('P') PORT_CODE(KEYCODE_P)
PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('[') PORT_CHAR('{') PORT_CODE(KEYCODE_OPENBRACE)
PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('l') PORT_CHAR('L') PORT_CODE(KEYCODE_L)
PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR(';') PORT_CHAR(':') PORT_CODE(KEYCODE_COLON)
PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('.') PORT_CHAR('>') PORT_CODE(KEYCODE_STOP)
PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('/') PORT_CHAR('?') PORT_CODE(KEYCODE_SLASH)
PORT_START("ROW3")
PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('8') PORT_CHAR('*') PORT_CODE(KEYCODE_8)
PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('9') PORT_CHAR('(') PORT_CODE(KEYCODE_9)
PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('i') PORT_CHAR('I') PORT_CODE(KEYCODE_I)
PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('o') PORT_CHAR('O') PORT_CODE(KEYCODE_O)
PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('k') PORT_CHAR('K') PORT_CODE(KEYCODE_K)
PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('l') PORT_CHAR('L') PORT_CODE(KEYCODE_L)
PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('m') PORT_CHAR('M') PORT_CODE(KEYCODE_M)
PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR(',') PORT_CHAR('<') PORT_CODE(KEYCODE_COMMA)
PORT_START("ROW4")
PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('6') PORT_CHAR('^') PORT_CODE(KEYCODE_6)
PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('7') PORT_CHAR('&') PORT_CODE(KEYCODE_7)
PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('y') PORT_CHAR('Y') PORT_CODE(KEYCODE_Y)
PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('u') PORT_CHAR('U') PORT_CODE(KEYCODE_U)
PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('g') PORT_CHAR('G') PORT_CODE(KEYCODE_G)
PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('h') PORT_CHAR('H') PORT_CODE(KEYCODE_H)
PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('b') PORT_CHAR('B') PORT_CODE(KEYCODE_B)
PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('n') PORT_CHAR('N') PORT_CODE(KEYCODE_N)
PORT_START("ROW5")
PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('4') PORT_CHAR('$') PORT_CODE(KEYCODE_4)
PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('5') PORT_CHAR('%') PORT_CODE(KEYCODE_5)
PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('r') PORT_CHAR('R') PORT_CODE(KEYCODE_R)
PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('t') PORT_CHAR('T') PORT_CODE(KEYCODE_T)
PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('d') PORT_CHAR('D') PORT_CODE(KEYCODE_D)
PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('f') PORT_CHAR('F') PORT_CODE(KEYCODE_F)
PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('c') PORT_CHAR('C') PORT_CODE(KEYCODE_C)
PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('v') PORT_CHAR('V') PORT_CODE(KEYCODE_V)
PORT_START("ROW6")
PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('2') PORT_CHAR('@') PORT_CODE(KEYCODE_2)
PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('3') PORT_CHAR('#') PORT_CODE(KEYCODE_3)
PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('w') PORT_CHAR('W') PORT_CODE(KEYCODE_W)
PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('e') PORT_CHAR('E') PORT_CODE(KEYCODE_E)
PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('a') PORT_CHAR('A') PORT_CODE(KEYCODE_A)
PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('s') PORT_CHAR('S') PORT_CODE(KEYCODE_S)
PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('z') PORT_CHAR('Z') PORT_CODE(KEYCODE_Z)
PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('x') PORT_CHAR('X') PORT_CODE(KEYCODE_X)
PORT_START("ROW7")
PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR(0x1b) PORT_CODE(KEYCODE_ESC)
PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('1') PORT_CHAR('!') PORT_CODE(KEYCODE_1)
PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR(0x09) PORT_CODE(KEYCODE_TAB)
PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('q') PORT_CHAR('Q') PORT_CODE(KEYCODE_Q)
PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR(UCHAR_SHIFT_1) PORT_NAME("Left Shift") PORT_CODE(KEYCODE_LSHIFT)
PORT_START("ROW8")
PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR(0x08) PORT_CODE(KEYCODE_BACKSPACE)
PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_UNUSED)
PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_UNUSED)
PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR('\\') PORT_CHAR('|') PORT_CODE(KEYCODE_BACKSLASH)
PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR(' ') PORT_CODE(KEYCODE_SPACE)
PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_START("ROW9")
PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_START("ROW10")
PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_UNKNOWN)
PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_UNKNOWN)
INPUT_PORTS_END
void v100_state::v100(machine_config &config)
{
Z80(config, m_maincpu, 47.736_MHz_XTAL / 20); // 2.387 MHz PCLOCK
m_maincpu->set_addrmap(AS_PROGRAM, &v100_state::mem_map);
m_maincpu->set_addrmap(AS_IO, &v100_state::io_map);
m_maincpu->set_irq_acknowledge_callback(FUNC(v100_state::irq_ack));
I8251(config, m_usart[0], 47.736_MHz_XTAL / 20);
m_usart[0]->txd_handler().set(m_modem, FUNC(rs232_port_device::write_txd));
m_usart[0]->dtr_handler().set(m_modem, FUNC(rs232_port_device::write_dtr));
m_usart[0]->rts_handler().set(m_modem, FUNC(rs232_port_device::write_rts));
//m_usart[0]->rxrdy_handler().set(FUNC(v100_state::picu_r_w<4>)).invert();
input_merger_device &acts(INPUT_MERGER_ALL_HIGH(config, "acts"));
acts.output_handler().set(m_usart[0], FUNC(i8251_device::write_cts));
com8116_device &brg1(COM8116_020(config, "brg1", 1.8432_MHz_XTAL));
brg1.fr_handler().set(m_usart[0], FUNC(i8251_device::write_rxc));
brg1.ft_handler().set(m_usart[0], FUNC(i8251_device::write_txc));
I8251(config, m_usart[1], 47.736_MHz_XTAL / 20);
m_usart[1]->txd_handler().set("aux", FUNC(rs232_port_device::write_txd));
m_usart[1]->dtr_handler().set("aux", FUNC(rs232_port_device::write_dtr));
//m_usart[1]->txrdy_handler().set(FUNC(v100_state::picu_r_w<2>)).invert();
com8116_device &brg2(COM8116_020(config, "brg2", 1.8432_MHz_XTAL));
brg2.fr_handler().set(m_usart[1], FUNC(i8251_device::write_rxc));
brg2.ft_handler().set(m_usart[1], FUNC(i8251_device::write_txc));
SCREEN(config, m_screen, SCREEN_TYPE_RASTER);
//m_screen->set_raw(47.736_MHz_XTAL / 2, 102 * V100_CH_WIDTH, 0, 80 * V100_CH_WIDTH, 260, 0, 240);
m_screen->set_raw(47.736_MHz_XTAL, 170 * V100_CH_WIDTH, 0, 132 * V100_CH_WIDTH, 312, 0, 240);
m_screen->set_screen_update(FUNC(v100_state::screen_update));
CRT5037(config, m_vtac, 47.736_MHz_XTAL / V100_CH_WIDTH);
m_vtac->set_char_width(V100_CH_WIDTH);
m_vtac->set_screen("screen");
m_vtac->hsyn_callback().set(FUNC(v100_state::picu_r_w<7>)).invert();
m_vtac->vsyn_callback().set(FUNC(v100_state::picu_r_w<6>)).invert();
I8214(config, m_picu, 47.736_MHz_XTAL / 20);
m_picu->int_wr_callback().set_inputline(m_maincpu, 0, ASSERT_LINE);
i8255_device &ppi(I8255(config, "ppi", 0));
ppi.out_pa_callback().set(FUNC(v100_state::ppi_porta_w));
ppi.out_pb_callback().set(m_earom, FUNC(er1400_device::c3_w)).bit(6).invert();
ppi.out_pb_callback().append(m_earom, FUNC(er1400_device::c2_w)).bit(5).invert();
ppi.out_pb_callback().append(m_earom, FUNC(er1400_device::c1_w)).bit(4).invert();
ppi.out_pc_callback().set(m_earom, FUNC(er1400_device::data_w)).bit(6).invert();
ppi.out_pc_callback().append(m_earom, FUNC(er1400_device::clock_w)).bit(0).invert();
ppi.out_pc_callback().append(m_modem, FUNC(rs232_port_device::write_spds)).bit(4);
ppi.out_pc_callback().append("acts", FUNC(input_merger_device::in_w<1>)).bit(7);
ER1400(config, m_earom);
RS232_PORT(config, m_modem, default_rs232_devices, "loopback"); // EIA port
m_modem->rxd_handler().set(m_usart[0], FUNC(i8251_device::write_rxd));
m_modem->cts_handler().set("acts", FUNC(input_merger_device::in_w<0>));
m_modem->dcd_handler().set(m_usart[0], FUNC(i8251_device::write_dsr));
rs232_port_device &aux(RS232_PORT(config, "aux", default_rs232_devices, nullptr)); // optional printer port
aux.rxd_handler().set(m_usart[1], FUNC(i8251_device::write_rxd));
aux.dcd_handler().set(m_usart[1], FUNC(i8251_device::write_dsr)); // printer busy
}
/**************************************************************************************************************
Visual 100. (VT-100 clone)
Chips: D780C-1 (Z80), CRT5037, D8255AC-5, uPB8214C, COM8116T-020, D8251AC, ER1400, 8-sw dip
Crystal: 47.736
***************************************************************************************************************/
ROM_START( v100 )
ROM_REGION(0x2000, "maincpu", 0)
ROM_LOAD( "262-047.u108", 0x0000, 0x1000, CRC(e82f708c) SHA1(20ed83a41fd0703d72a20e170af971181cfbd575) )
ROM_LOAD( "262-048.u110", 0x1000, 0x1000, CRC(830923d3) SHA1(108590234ff84b5856cc2784d738a2a625305953) )
ROM_REGION(0x0800, "chargen", 0)
ROM_LOAD( "241-001.u29", 0x0000, 0x0800, CRC(ef807141) SHA1(cbf3fed001811c5840b9a131d2d3133843cb3b6a) )
ROM_END
} // anonymous namespace
COMP( 1980, v100, 0, 0, v100, v100, v100_state, empty_init, "Visual Technology", "Visual 100", MACHINE_IS_SKELETON )