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cit220p, vp122: Put some dots on the screen; add 80-/132-column switch (nw)

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This commit is contained in:
AJR 2018-11-15 22:03:53 -05:00
parent 1777d0cbb1
commit 53a69be56f
1 changed files with 29 additions and 4 deletions
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33
src/mame/drivers/cit220.cpp
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@ -43,6 +43,7 @@ private:
virtual void machine_start() override;
DECLARE_WRITE_LINE_MEMBER(sod_w);
DECLARE_WRITE_LINE_MEMBER(cols_w);
SCN2674_DRAW_CHARACTER_MEMBER(draw_character);
void cit220p_mem_map(address_map &map);
@ -58,12 +59,17 @@ private:
required_device<screen_device> m_screen;
required_device<scn2674_device> m_avdc;
required_region_ptr<u8> m_chargen;
bool m_132_cols;
};
void cit220_state::machine_start()
{
subdevice<i8251_device>("usart")->write_cts(0);
m_132_cols = false;
save_item(NAME(m_132_cols));
}
@ -72,6 +78,16 @@ WRITE_LINE_MEMBER(cit220_state::sod_w)
// probably asserts PBREQ on SCN2674 to access memory at Exxx
}
WRITE_LINE_MEMBER(cit220_state::cols_w)
{
if (!state != m_132_cols)
{
m_132_cols = !state;
m_avdc->set_character_width(m_132_cols ? 9 : 10);
m_avdc->set_unscaled_clock(m_132_cols ? 22'096'000 / 9 : 14'916'000 / 10);
}
}
void cit220_state::cit220p_mem_map(address_map &map)
{
map(0x0000, 0x7fff).rom().region("maincpu", 0);
@ -109,6 +125,14 @@ void cit220_state::vp122_io_map(address_map &map)
SCN2674_DRAW_CHARACTER_MEMBER(cit220_state::draw_character)
{
u16 dots = m_chargen[charcode << 4 | linecount] << 2;
const int width = m_132_cols ? 9 : 10;
for (int i = 0; i < width; i++)
{
bitmap.pix32(y, x++) = BIT(dots, 9) ? rgb_t::white() : rgb_t::black();
dots <<= 1;
}
}
void cit220_state::char_map(address_map &map)
@ -149,7 +173,7 @@ void cit220_state::cit220p(machine_config &config)
SCN2674(config, m_avdc, 22'096'000 / 9);
m_avdc->intr_callback().set_inputline(m_maincpu, I8085_RST65_LINE);
m_avdc->set_character_width(9); // 10 in 80-column mode
m_avdc->set_character_width(9); // 10 in 80-column modes
m_avdc->set_display_callback(FUNC(cit220_state::draw_character));
m_avdc->set_addrmap(0, &cit220_state::char_map);
m_avdc->set_addrmap(1, &cit220_state::attr_map);
@ -159,6 +183,7 @@ void cit220_state::cit220p(machine_config &config)
duart.irq_cb().set_inputline("maincpu", I8085_RST55_LINE);
duart.outport_cb().set("usart", FUNC(i8251_device::write_txc)).bit(3); // 9600 baud?
duart.outport_cb().append("usart", FUNC(i8251_device::write_rxc)).bit(3);
duart.outport_cb().append(FUNC(cit220_state::cols_w)).bit(7);
I8251(config, "usart", 4'000'000);
@ -192,7 +217,7 @@ void cit220_state::vp122(machine_config &config)
duart.irq_cb().set_inputline("maincpu", I8085_RST55_LINE);
duart.outport_cb().set("usart", FUNC(i8251_device::write_txc)).bit(3);
duart.outport_cb().append("usart", FUNC(i8251_device::write_rxc)).bit(3);
// OP7 = 0 for 80-column modes, 1 for 132-column modes
duart.outport_cb().append(FUNC(cit220_state::cols_w)).bit(7);
I8251(config, "usart", 8_MHz_XTAL / 2);
@ -234,5 +259,5 @@ ROM_START( vp122 )
ROM_LOAD( "223-48700.uk4", 0x0000, 0x2000, CRC(4dbab4bd) SHA1(18e9a23ba22e2096fa529541fa329f5a56740e62) )
ROM_END
COMP( 1984, cit220p, 0, 0, cit220p, cit220p, cit220_state, empty_init, "C. Itoh Electronics", "CIT-220+ Video Terminal", MACHINE_IS_SKELETON )
COMP( 1985, vp122, 0, 0, vp122, cit220p, cit220_state, empty_init, "ADDS", "Viewpoint 122", MACHINE_IS_SKELETON )
COMP(1984, cit220p, 0, 0, cit220p, cit220p, cit220_state, empty_init, "C. Itoh Electronics", "CIT-220+ Video Terminal", MACHINE_NOT_WORKING | MACHINE_IMPERFECT_GRAPHICS | MACHINE_NO_SOUND)
COMP(1985, vp122, 0, 0, vp122, cit220p, cit220_state, empty_init, "ADDS", "Viewpoint 122", MACHINE_NOT_WORKING | MACHINE_IMPERFECT_GRAPHICS | MACHINE_NO_SOUND)