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t7000: Add some interrupts and video (pseudo) DMA

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This commit is contained in:
AJR 2023-11-26 20:52:04 -05:00
parent 4757a5e338
commit e3ac3a01d3
1 changed files with 83 additions and 2 deletions
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85
src/mame/wicat/t7000.cpp
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@ -10,6 +10,7 @@
//#include "bus/rs232/rs232.h"
#include "cpu/z80/z80.h"
#include "machine/74259.h"
#include "machine/input_merger.h"
#include "machine/scn_pci.h"
#include "machine/x2212.h"
#include "video/i8275.h"
@ -23,32 +24,96 @@ public:
t7000_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag)
, m_maincpu(*this, "maincpu")
, m_mainint(*this, "mainint")
, m_outlatch(*this, "outlatch")
, m_pci(*this, "pci%u", 0U)
, m_crtc(*this, "crtc%u", 0U)
, m_vram(*this, "vram")
, m_vram_view(*this, "vram")
, m_chargen(*this, "chargen")
, m_vblint(false)
{
}
void t7000(machine_config &config);
protected:
virtual void machine_start() override;
private:
I8275_DRAW_CHARACTER_MEMBER(display_character);
u8 vram_dma_r(offs_t offset);
u8 vblint_status_r();
void vblint_enable_w(int state);
void dma_enable_w(int state);
void vblint_w(int state);
void crtc_combined_w(offs_t offset, u8 data);
void mem_map(address_map &map);
void io_map(address_map &map);
required_device<cpu_device> m_maincpu;
required_device<input_merger_device> m_mainint;
required_device<ls259_device> m_outlatch;
required_device_array<scn_pci_device, 2> m_pci;
required_device_array<i8275_device, 2> m_crtc;
required_shared_ptr<u8> m_vram;
memory_view m_vram_view;
required_region_ptr<u8> m_chargen;
bool m_vblint;
};
void t7000_state::machine_start()
{
save_item(NAME(m_vblint));
}
I8275_DRAW_CHARACTER_MEMBER(t7000_state::display_character)
{
}
u8 t7000_state::vram_dma_r(offs_t offset)
{
u8 data = m_vram[offset];
if (!machine().side_effects_disabled())
m_crtc[0]->dack_w(data);
return data;
}
u8 t7000_state::vblint_status_r()
{
// Only bit 5 is ever examined
return m_vblint ? 0x20 : 0x00;
}
void t7000_state::vblint_enable_w(int state)
{
if (!state && m_vblint)
{
m_vblint = false;
m_mainint->in_w<4>(0);
}
}
void t7000_state::dma_enable_w(int state)
{
if (state)
m_vram_view.select(0);
else
m_vram_view.disable();
}
void t7000_state::vblint_w(int state)
{
if (state && m_outlatch->q0_r() && !m_vblint)
{
m_vblint = true;
m_mainint->in_w<4>(1);
}
}
void t7000_state::crtc_combined_w(offs_t offset, u8 data)
{
for (auto &crtc : m_crtc)
@ -58,13 +123,17 @@ void t7000_state::crtc_combined_w(offs_t offset, u8 data)
void t7000_state::mem_map(address_map &map)
{
map(0x0000, 0x3fff).rom().region("program", 0);
map(0x4000, 0x7fff).ram();
map(0x4000, 0x7fff).ram().share(m_vram);
map(0x4000, 0x7fff).view(m_vram_view);
m_vram_view[0](0x4000, 0x7fff).r(FUNC(t7000_state::vram_dma_r));
map(0x8000, 0x803f).rw("novram", FUNC(x2210_device::read), FUNC(x2210_device::write));
}
void t7000_state::io_map(address_map &map)
{
map.global_mask(0xff);
map(0x80, 0x80).r(FUNC(t7000_state::vblint_status_r));
map(0xa1, 0xa1).nopr(); // ?
map(0xb0, 0xb1).w(FUNC(t7000_state::crtc_combined_w));
map(0xb2, 0xb3).rw(m_crtc[0], FUNC(i8275_device::read), FUNC(i8275_device::write));
map(0xb4, 0xb5).rw(m_crtc[1], FUNC(i8275_device::read), FUNC(i8275_device::write));
@ -83,13 +152,23 @@ void t7000_state::t7000(machine_config &config)
m_maincpu->set_addrmap(AS_PROGRAM, &t7000_state::mem_map);
m_maincpu->set_addrmap(AS_IO, &t7000_state::io_map);
INPUT_MERGER_ANY_HIGH(config, m_mainint).output_handler().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
INPUT_MERGER_ALL_HIGH(config, "mainnmi").output_handler().set_inputline(m_maincpu, INPUT_LINE_NMI);
X2210(config, "novram"); // U39
SCN2651(config, m_pci[0], 5.0688_MHz_XTAL);
m_pci[0]->txrdy_handler().set(m_mainint, FUNC(input_merger_device::in_w<0>));
m_pci[0]->rxrdy_handler().set(m_mainint, FUNC(input_merger_device::in_w<1>));
SCN2651(config, m_pci[1], 5.0688_MHz_XTAL);
m_pci[1]->txrdy_handler().set(m_mainint, FUNC(input_merger_device::in_w<2>));
m_pci[1]->rxrdy_handler().set(m_mainint, FUNC(input_merger_device::in_w<3>));
LS259(config, "outlatch"); // U43
LS259(config, m_outlatch); // U43
m_outlatch->q_out_cb<0>().set(FUNC(t7000_state::vblint_enable_w));
m_outlatch->q_out_cb<1>().set(FUNC(t7000_state::dma_enable_w));
m_outlatch->q_out_cb<6>().set("mainnmi", FUNC(input_merger_device::in_w<0>));
screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
screen.set_raw(19.6608_MHz_XTAL, 1020, 0, 800, 324, 0, 300);
@ -98,6 +177,8 @@ void t7000_state::t7000(machine_config &config)
I8276(config, m_crtc[0], 19.6608_MHz_XTAL / 10);
m_crtc[0]->set_character_width(10);
m_crtc[0]->set_display_callback(FUNC(t7000_state::display_character));
m_crtc[0]->drq_wr_callback().set("mainnmi", FUNC(input_merger_device::in_w<1>));
m_crtc[0]->vrtc_wr_callback().set(FUNC(t7000_state::vblint_w));
m_crtc[0]->set_screen("screen");
I8276(config, m_crtc[1], 19.6608_MHz_XTAL / 10);