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v550: Add baud rate generators and SCN2672 independent buffer access (nw)

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This commit is contained in:
AJR 2018-06-22 08:35:49 -04:00
parent a0f5fd65b2
commit aa67baf334
1 changed files with 35 additions and 5 deletions
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40
src/mame/drivers/v550.cpp
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@ -15,7 +15,8 @@
#include "emu.h"
//include "bus/rs232/rs232.h"
#include "cpu/z80/z80.h"
//#include "machine/com8116.h"
#include "machine/com8116.h"
#include "machine/input_merger.h"
#include "machine/nvram.h"
#include "machine/i8251.h"
#include "machine/i8255.h"
@ -30,6 +31,7 @@ public:
v550_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag)
, m_maincpu(*this, "maincpu")
, m_brg(*this, "brg%u", 1U)
, m_screen(*this, "screen")
, m_chargen(*this, "chargen")
{ }
@ -38,17 +40,26 @@ public:
u32 screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect) { return 0; }
private:
DECLARE_WRITE8_MEMBER(baud_rate_w);
void mem_map(address_map &map);
void io_map(address_map &map);
void pvtc_map(address_map &map);
virtual void machine_start() override;
required_device<cpu_device> m_maincpu;
required_device_array<com8116_device, 2> m_brg;
required_device<screen_device> m_screen;
required_region_ptr<u8> m_chargen;
};
WRITE8_MEMBER(v550_state::baud_rate_w)
{
m_brg[offset >> 6]->write_stt(data >> 4);
m_brg[offset >> 6]->write_str(data & 0x0f);
}
void v550_state::mem_map(address_map &map)
{
map(0x0000, 0x7bff).rom().region("maincpu", 0);
@ -60,6 +71,7 @@ void v550_state::io_map(address_map &map)
{
map.global_mask(0xff);
map(0x00, 0x01).rw("gdc", FUNC(upd7220_device::read), FUNC(upd7220_device::write));
map(0x10, 0x10).select(0x40).w(FUNC(v550_state::baud_rate_w));
map(0x20, 0x23).rw("ppi", FUNC(i8255_device::read), FUNC(i8255_device::write));
map(0x30, 0x30).rw("usart", FUNC(i8251_device::data_r), FUNC(i8251_device::data_w));
map(0x31, 0x31).rw("usart", FUNC(i8251_device::status_r), FUNC(i8251_device::control_w));
@ -68,7 +80,13 @@ void v550_state::io_map(address_map &map)
map(0x48, 0x48).rw("mpsc", FUNC(upd7201_new_device::db_r), FUNC(upd7201_new_device::db_w));
map(0x49, 0x49).rw("mpsc", FUNC(upd7201_new_device::cb_r), FUNC(upd7201_new_device::cb_w));
map(0x60, 0x67).rw("pvtc", FUNC(scn2672_device::read), FUNC(scn2672_device::write));
map(0x70, 0x70).nopw(); // DRAM refresh address?
map(0x70, 0x70).rw("pvtc", FUNC(scn2672_device::buffer_r), FUNC(scn2672_device::buffer_w));
map(0x71, 0x71).noprw(); // TODO: attribute buffer
}
void v550_state::pvtc_map(address_map &map)
{
map(0x0000, 0x0fff).ram();
}
@ -94,18 +112,30 @@ MACHINE_CONFIG_START(v550_state::v550)
MCFG_DEVICE_ADD("ppi", I8255, 0) // NEC D8255AC-5
MCFG_DEVICE_ADD("usart", I8251, 4'000'000) // NEC D8251AC
MCFG_I8251_RXRDY_HANDLER(WRITELINE("mainint", input_merger_device, in_w<1>))
MCFG_DEVICE_ADD("mpsc", UPD7201_NEW, 4'000'000) // NEC D7201C
MCFG_Z80SIO_OUT_INT_CB(INPUTLINE("maincpu", INPUT_LINE_IRQ0))
MCFG_Z80SIO_OUT_INT_CB(WRITELINE("mainint", input_merger_device, in_w<0>))
//MCFG_DEVICE_ADD("brg1", COM8116_020, 5068800)
//MCFG_DEVICE_ADD("brg2", COM8116_020, 5068800)
MCFG_INPUT_MERGER_ANY_HIGH("mainint")
MCFG_INPUT_MERGER_OUTPUT_HANDLER(INPUTLINE("maincpu", INPUT_LINE_IRQ0))
MCFG_DEVICE_ADD("brg1", COM8116, 5068800) // actually SMC COM8116T-020 (unknown clock)
MCFG_COM8116_FT_HANDLER(WRITELINE("mpsc", upd7201_new_device, txca_w))
MCFG_COM8116_FR_HANDLER(WRITELINE("mpsc", upd7201_new_device, rxca_w))
MCFG_DEVICE_ADD("brg2", COM8116, 5068800) // actually SMC COM8116T-020
MCFG_COM8116_FT_HANDLER(WRITELINE("mpsc", upd7201_new_device, txcb_w))
MCFG_DEVCB_CHAIN_OUTPUT(WRITELINE("mpsc", upd7201_new_device, rxcb_w))
MCFG_COM8116_FR_HANDLER(WRITELINE("usart", i8251_device, write_txc))
MCFG_DEVCB_CHAIN_OUTPUT(WRITELINE("usart", i8251_device, write_rxc))
MCFG_SCREEN_ADD("screen", RASTER)
MCFG_SCREEN_RAW_PARAMS(16'248'600, 918, 0, 720, 295, 0, 272)
MCFG_SCREEN_UPDATE_DRIVER(v550_state, screen_update)
MCFG_DEVICE_ADD("pvtc", SCN2672, 1'805'400)
MCFG_DEVICE_ADDRESS_MAP(0, pvtc_map)
MCFG_SCN2672_CHARACTER_WIDTH(9)
MCFG_SCN2672_INTR_CALLBACK(INPUTLINE("maincpu", INPUT_LINE_NMI))
MCFG_VIDEO_SET_SCREEN("screen")